ModernCalcs

Developer Tools

A collection of privacy-first, client-side tools for software engineers. Decode, format, and debug without your data ever leaving the browser.

JSON Formatter + Validator
Format, beautify, and deep-validate JSON syntax with line pointers.
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JSON ↔ CSV ↔ XML
Multi-way data converter for JSON, CSV, and XML formats.
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SQL Formatter
Beautify and clean up SQL queries for multiple dialects.
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Cron Expression Builder
Build and parse complex cron schedules with a visual interface.
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Regex Tester
Test Regular Expressions with real-time explanation and matching.
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JWT Decoder
Safely decode JWTs locally with claim explanations and metadata.
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URL Encoder / Decoder
Safely encode special characters for URLs or decode a URI component.
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Text Diff Checker
Compare two pieces of text side-by-side and highlight differences.
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CSS Unit Converter
Convert between pixels, rem, em, and viewport units instantly.
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UUID Generator
Bulk generate cryptographically secure Version 4 UUIDs.
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Base64 & Image Tool
Encode/decode text and images to Base64 Data URIs.
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IP Subnet Calculator
Professional CIDR tool for network range and host capacity.
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Time Zone Pro
Coordinate meetings with IST-focused presets for remote teams.
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Bandwidth Estimator
Calculate file transfer times and Mbps vs MB/s conversion.
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Curl to Code
Instantly convert curl commands to Python, JS, Go, and more.
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JSON to CSV Converter
Convert JSON arrays of objects to CSV with custom delimiters and instant download.
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Hourly to Salary Calculator
Convert hourly wage to annual, monthly, bi-weekly and weekly salary with schedule controls.
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Tip Calculator
Calculate tip amount, total bill, and split evenly across any party size.
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Webhook Payload Generator
Generate realistic sample webhook JSON for GitHub, Stripe, Slack, and generic events to test your handlers.
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JSON to XML
Convert JSON objects to well-formed XML. Nested objects become child elements, arrays expand to item tags.
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JSON to TypeScript
Infer TypeScript interfaces from JSON. Nested objects, typed arrays, and union types generated instantly.
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JSON to YAML
Convert JSON to YAML for Kubernetes, Docker Compose, and CI config files.
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JSON to TOML
Convert JSON to TOML for Rust Cargo.toml, Python pyproject.toml, and Hugo configs.
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JSON to Zod Schema
Generate Zod validation schemas from JSON objects for TypeScript runtime validation.
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JSON Diff
Deep-compare two JSON objects. See added, removed, and changed fields with dot-notation paths.
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JSON Escape / Unescape
Escape raw strings to JSON-safe literals or unescape JSON string values back to raw text.
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JSON Flattener
Flatten nested JSON to dot-notation paths or unflatten back to nested objects.
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JSON Size Analyzer
Count keys, measure bytes, and analyze nesting depth and type distribution of any JSON document.
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JSONL Formatter
Format, minify, or validate newline-delimited JSON (JSONL / NDJSON) line by line.
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CSV to JSON
Parse CSV into a JSON array of objects. Header row becomes keys, numbers auto-detected.
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CSV to HTML Table
Convert CSV to a styled HTML table with striped rows, borders, and live preview.
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CSV to SQL INSERT
Generate SQL INSERT statements from CSV. Supports MySQL and ANSI SQL dialects.
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CSV to XML
Convert CSV to well-formed XML with configurable root and row tag names.
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CSV ↔ TSV Converter
Convert between comma-separated and tab-separated values with one click.
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CSV to Markdown Table
Generate GitHub-flavored Markdown tables from CSV with left, center, or right alignment.
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CSV Deduplicator
Remove duplicate rows from CSV — deduplicate by all columns or a specific key column.
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CSV Sorter
Sort CSV rows by any column, ascending or descending. Toggle numeric sort for number columns.
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CSV Row Filter
Filter CSV rows by column value — contains, equals, greater than, and more.
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CSV Column Extractor
Select which CSV columns to keep and discard the rest with toggle buttons.
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CSV Column Renamer
Rename CSV column headers without touching data rows. Leave blank to keep original name.
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TSV to CSV Converter
Convert tab-separated values to CSV with proper RFC 4180 quoting.
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HTML Table to CSV
Extract HTML table rows and cells as CSV. Strips tags and decodes entities.
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SQL INSERT to JSON
Convert SQL INSERT statements to a JSON array of objects with typed values.
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SQL to CSV Converter
Convert SQL INSERT statements to CSV with column headers and proper quoting.
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CSV Data Cleaner
Trim whitespace, remove blank rows, and deduplicate CSV data.
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CSV Data Type Converter
Auto-detect column types and convert numbers, booleans, and case in CSV.
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CSV Format Validator
Validate CSV structure: column count consistency, unclosed quotes, blank rows.
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CSV Null Value Handler
Fill empty fields, replace null markers, or drop rows with missing values.
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CSV to Excel Converter
Convert CSV to Excel .xlsx in the browser. Name your sheet, download instantly.
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Excel to CSV Converter
Convert Excel .xlsx/.xls to CSV. Sheet selector for multi-sheet workbooks.
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JSON to Excel Converter
Convert a JSON array of objects to Excel. Keys become headers, nested objects flattened.
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CSV Merger
Merge multiple CSV files with column-name or position alignment.
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CSV Pivot Generator
Generate pivot tables from CSV: row × column dimension with sum, count, avg.
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CSV Splitter
Split CSV by row count or column value. Each chunk includes the header row.
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XML to JSON
Convert XML to JSON. Attributes become @attr keys, repeated elements become arrays.
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XML to CSV Converter
Convert XML record elements to CSV with dot-notation flattening for nested children.
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XML to TOML Converter
Convert XML config to TOML. Child elements become sections, type inference on leaf values.
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YAML to TOML Converter
Convert YAML config to TOML. Mappings become [sections], object sequences become [[array-of-tables]].
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YAML Validator
Validate YAML indentation and syntax. Shows parsed structure as JSON for verification.
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JSON Schema Generator
Generate JSON Schema Draft 2020-12 from sample JSON. Type inference, format detection.
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JSON-LD Generator
Generate JSON-LD structured data for Article, Product, FAQPage, Event, and more schema types.
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CSV to Parquet Converter
Generate Python + pandas code to convert CSV to Parquet. Auto-detects column types.
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Parquet File Viewer
Validate Parquet magic bytes and generate Python code to inspect schema and row groups.
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Parquet to CSV Converter
Generate Python pyarrow code to convert Parquet to CSV with column selection and chunk mode.
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CSS Minifier
Remove comments and whitespace from CSS. See exact byte savings instantly.
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HTML Minifier
Collapse whitespace and remove comments from HTML to reduce document size.
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JS Minifier
Strip comments and collapse whitespace from JavaScript. Preserves strings and regex.
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CSS Beautifier
Format minified or unindented CSS with configurable indentation.
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JS Beautifier
Add indentation and newlines to minified JavaScript for readability.
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TypeScript Formatter
Format TypeScript code with brace-depth indentation. Handles interfaces and generics.
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INI to JSON
Parse INI config files to JSON. Sections become nested objects, comments stripped.
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TOML to JSON
Convert TOML to JSON. Handles [tables], [[arrays of tables]], and typed values.
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YAML to JSON
Convert YAML to JSON. Mappings, sequences, block scalars, and type coercion.
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C++ Formatter
Beautify C++ code with brace-depth indentation. Preprocessor directives stay at column 0.
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Go Formatter
Format Go code with brace-depth indentation. Opening brace preserved on same line.
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Kotlin Formatter
Indent Kotlin classes, functions, and lambdas with 4-space brace-depth formatting.
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PHP Beautifier
Format PHP code with brace-depth indentation. PSR-12 standard 4-space indent.
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Rust Formatter
Beautify Rust code — struct, impl, fn blocks with derive attributes kept at column 0.
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Swift Formatter
Format Swift classes, structs, protocols, and closures with 4-space indentation.
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HTML Beautifier
Expand minified HTML into indented markup. Block elements get their own lines.
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Python Formatter
Normalize Python: tabs to 4 spaces, strip trailing whitespace, collapse blank lines.
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Ruby Formatter
Format Ruby with keyword-based indentation — def/end, class/end, do/end blocks.
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Pug to HTML
Convert Pug template syntax to plain HTML — tags, classes, IDs, attributes, nesting.
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CSS to SCSS
Convert CSS to SCSS with automatic $variable extraction for repeated color values.
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SCSS to CSS
Compile SCSS to CSS: substitute $variables and flatten nested selectors.
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LESS to CSS
Compile LESS to CSS: substitute @variables and flatten nested selectors.
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Stylus to CSS
Convert Stylus indentation-based syntax to plain CSS.
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Tailwind to CSS
Convert Tailwind utility classes to their exact CSS property equivalents.
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HTML to Markdown
Convert HTML markup to clean Markdown. Handles headings, links, lists, code blocks, and blockquotes.
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HTML to JSX
Convert HTML to React JSX syntax — class→className, inline styles to objects, void elements self-closed.
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Hex ↔ Text
Convert plain text to hexadecimal bytes or decode hex back to readable text.
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Unicode Converter
Convert text to Unicode code points (U+XXXX, \uXXXX, HTML entities) or decode them back.
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Base64 ↔ JSON
Encode JSON to Base64 or decode a Base64 string back to formatted JSON.
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URL Encoder / Decoder
Encode special characters for safe URLs or decode percent-encoded URLs back to readable text.
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Cookie Parser
Parse Cookie request headers into key-value pairs. URL-encoded values auto-decoded. Export as JSON.
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Query String Parser
Parse URL query strings into key-value pairs or build query strings from a parameter table.
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Email Validator
Validate email address format — syntax check, MX record lookup, and disposable domain detection.
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Port Number Lookup
Look up well-known TCP/UDP port numbers and their associated services.
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HTTP Status Codes
Look up HTTP status codes: 1xx info, 2xx success, 3xx redirect, 4xx client error, 5xx server error.
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MIME Type Finder
Find MIME types by file extension or search by content type.
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ASCII Table
Browse the full ASCII table with decimal, hex, octal, binary, and character representations.
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Random IP Generator
Generate random IPv4 or IPv6 addresses for testing and mock data.
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Random MAC Generator
Generate random MAC addresses in multiple formats for network testing.
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Regex to English
Translate regular expressions into plain English explanations — understand any regex instantly.
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JSONPath Finder
Query JSON documents with JSONPath — wildcards, recursive descent, filter expressions.
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User Agent Parser
Parse browser user-agent strings into browser, OS, device type, and version details.
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Aes Encrypt Decrypt
Free high-precision, offline-first client-side Aes Encrypt Decrypt tools with dynamic sliders and calculations.
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Api Cost Estimator
Free high-precision, offline-first client-side Api Cost Estimator tools with dynamic sliders and calculations.
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Code Diff Viewer
Free high-precision, offline-first client-side Code Diff Viewer tools with dynamic sliders and calculations.
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Nginx Config Generator
Instantly generate high-performance, secure Nginx virtual host configuration blocks.
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Rss Feed Validator
Free high-precision, offline-first client-side Rss Feed Validator tools with dynamic sliders and calculations.
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Git Commit Linter
Free high-precision, offline-first client-side Git Commit Linter tools with dynamic sliders and calculations.
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Package Json Validator
Free high-precision, offline-first client-side Package Json Validator tools with dynamic sliders and calculations.
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Html Validator
Free high-precision, offline-first client-side Html Validator tools with dynamic sliders and calculations.
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Css Specificity Calculator
Free high-precision, offline-first client-side Css Specificity tools with dynamic sliders and calculations.
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Glassmorphism CSS Generator
Design and preview ultra-premium glassmorphism UI cards with real-time CSS backdrop-filter export.
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Graphql Query Formatter
Free high-precision, offline-first client-side Graphql Query Formatter tools with dynamic sliders and calculations.
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Ab Test Calculator
Free high-precision, offline-first client-side Ab Test tools with dynamic sliders and calculations.
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Box Shadow Generator
Free high-precision, offline-first client-side Box Shadow tools with dynamic sliders and calculations.
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Breadcrumb Schema Generator
Free high-precision, offline-first client-side Breadcrumb Schema tools with dynamic sliders and calculations.
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Character Encoding Converter
Free high-precision, offline-first client-side Character Encoding Converter tools with dynamic sliders and calculations.
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Cidr Calculator
Free high-precision, offline-first client-side Cidr tools with dynamic sliders and calculations.
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Color Palette Generator
Free high-precision, offline-first client-side Color Palette tools with dynamic sliders and calculations.
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Color Shades Generator
Free high-precision, offline-first client-side Color Shades tools with dynamic sliders and calculations.
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Color Tints Generator
Free high-precision, offline-first client-side Color Tints tools with dynamic sliders and calculations.
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Csp Policy Generator
Free high-precision, offline-first client-side Csp Policy tools with dynamic sliders and calculations.
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Data Anonymizer
Free high-precision, offline-first client-side Data Anonymizer tools with dynamic sliders and calculations.
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Dataset Analyzer
Free high-precision, offline-first client-side Dataset Analyzer tools with dynamic sliders and calculations.
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Data Storage Converter
Free high-precision, offline-first client-side Data Storage Converter tools with dynamic sliders and calculations.
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Date To Timestamp
Free high-precision, offline-first client-side Date To Timestamp tools with dynamic sliders and calculations.
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Duplicate Word Remover
Free high-precision, offline-first client-side Duplicate Word Remover tools with dynamic sliders and calculations.
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Excel Data Cleaner
Free high-precision, offline-first client-side Excel Data Cleaner tools with dynamic sliders and calculations.
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Excel Sheet Merger
Free high-precision, offline-first client-side Excel Sheet Merger tools with dynamic sliders and calculations.
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Fake Address Generator
Free high-precision, offline-first client-side Fake Address tools with dynamic sliders and calculations.
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Fake Email Generator
Free high-precision, offline-first client-side Fake Email tools with dynamic sliders and calculations.
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Fake Name Generator
Free high-precision, offline-first client-side Fake Name tools with dynamic sliders and calculations.
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Fake Person Generator
Free high-precision, offline-first client-side Fake Person tools with dynamic sliders and calculations.
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Fake Phone Generator
Free high-precision, offline-first client-side Fake Phone tools with dynamic sliders and calculations.
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Faq Schema Generator
Free high-precision, offline-first client-side Faq Schema tools with dynamic sliders and calculations.
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Gitignore Generator
Free high-precision, offline-first client-side Gitignore tools with dynamic sliders and calculations.
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Google Serp Simulator
Free high-precision, offline-first client-side Google Serp Simulator tools with dynamic sliders and calculations.
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Gradient Generator
Free high-precision, offline-first client-side Gradient tools with dynamic sliders and calculations.
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Graphql Tester
Free high-precision, offline-first client-side Graphql Tester tools with dynamic sliders and calculations.
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Image Placeholder Generator
Free high-precision, offline-first client-side Image Placeholder tools with dynamic sliders and calculations.
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Image To Color Palette
Free high-precision, offline-first client-side Image To Color Palette tools with dynamic sliders and calculations.
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Large Text File Viewer
Free high-precision, offline-first client-side Large Text File Viewer tools with dynamic sliders and calculations.
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License Generator
Free high-precision, offline-first client-side License tools with dynamic sliders and calculations.
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Line Counter
Free high-precision, offline-first client-side Line Counter tools with dynamic sliders and calculations.
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Log File Analyzer
Free high-precision, offline-first client-side Log File Analyzer tools with dynamic sliders and calculations.
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Logo Placeholder Generator
Free high-precision, offline-first client-side Logo Placeholder tools with dynamic sliders and calculations.
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Markdown Table Generator
Free high-precision, offline-first client-side Markdown Table tools with dynamic sliders and calculations.
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Markdown To Slack
Free high-precision, offline-first client-side Markdown To Slack tools with dynamic sliders and calculations.
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Memorable Password Generator
Free high-precision, offline-first client-side Memorable Password tools with dynamic sliders and calculations.
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Number Base Converter
Free high-precision, offline-first client-side Number Base Converter tools with dynamic sliders and calculations.
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Oauth Pkce Generator
Free high-precision, offline-first client-side Oauth Pkce tools with dynamic sliders and calculations.
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Oauth Scope Builder
Free high-precision, offline-first client-side Oauth Scope Builder tools with dynamic sliders and calculations.
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Og Preview Tester
Free high-precision, offline-first client-side Og Preview Tester tools with dynamic sliders and calculations.
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Password Entropy Calculator
Free high-precision, offline-first client-side Password Entropy tools with dynamic sliders and calculations.
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Password Strength Checker
Free high-precision, offline-first client-side Password Strength Checker tools with dynamic sliders and calculations.
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Pin Generator
Free high-precision, offline-first client-side Pin tools with dynamic sliders and calculations.
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Product Schema Generator
Free high-precision, offline-first client-side Product Schema tools with dynamic sliders and calculations.
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Px To Rem Converter
Free high-precision, offline-first client-side Px To Rem Converter tools with dynamic sliders and calculations.
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Qr Code Generator
Free high-precision, offline-first client-side Qr Code tools with dynamic sliders and calculations.
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Random Date Generator
Free high-precision, offline-first client-side Random Date tools with dynamic sliders and calculations.
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Random Number Generator
Free high-precision, offline-first client-side Random Number tools with dynamic sliders and calculations.
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Random Time Generator
Free high-precision, offline-first client-side Random Time tools with dynamic sliders and calculations.
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Random Word Generator
Free high-precision, offline-first client-side Random Word tools with dynamic sliders and calculations.
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Rate Limit Header Parser
Free high-precision, offline-first client-side Rate Limit Header Parser tools with dynamic sliders and calculations.
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Rest Endpoint Documenter
Free high-precision, offline-first client-side Rest Endpoint Documenter tools with dynamic sliders and calculations.
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Robots Txt Generator
Free high-precision, offline-first client-side Robots Txt tools with dynamic sliders and calculations.
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Secret Scanner
Free high-precision, offline-first client-side Secret Scanner tools with dynamic sliders and calculations.
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Semver Calculator
Free high-precision, offline-first client-side Semver tools with dynamic sliders and calculations.
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String Template Tester
Free high-precision, offline-first client-side String Template Tester tools with dynamic sliders and calculations.
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Svg Optimizer
Free high-precision, offline-first client-side Svg Optimizer tools with dynamic sliders and calculations.
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Syllable Counter
Free high-precision, offline-first client-side Syllable Counter tools with dynamic sliders and calculations.
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Test Data Generator
Free high-precision, offline-first client-side Test Data tools with dynamic sliders and calculations.
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Text Cleaner
Free high-precision, offline-first client-side Text Cleaner tools with dynamic sliders and calculations.
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Text Splitter
Free high-precision, offline-first client-side Text Splitter tools with dynamic sliders and calculations.
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Time Zone Converter
Free high-precision, offline-first client-side Time Zone Converter tools with dynamic sliders and calculations.
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Timestamp To Date
Free high-precision, offline-first client-side Timestamp To Date tools with dynamic sliders and calculations.
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Trailing Space Remover
Free high-precision, offline-first client-side Trailing Space Remover tools with dynamic sliders and calculations.
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Utm Builder
Free high-precision, offline-first client-side Utm Builder tools with dynamic sliders and calculations.
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Cron Expression Validator
Free high-precision, offline-first client-side Cron Expression Validator tools with dynamic sliders and calculations.
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Date Difference Calculator
Free high-precision, offline-first client-side Date Difference tools with dynamic sliders and calculations.
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Env File Parser
Free high-precision, offline-first client-side Env File Parser tools with dynamic sliders and calculations.
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Env Variable Template
Free high-precision, offline-first client-side Env Variable Template tools with dynamic sliders and calculations.
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File Compressor Zip
Free high-precision, offline-first client-side File Compressor Zip tools with dynamic sliders and calculations.
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Zip File Extractor
Free high-precision, offline-first client-side Zip File Extractor tools with dynamic sliders and calculations.
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Conventional Commit Generator
Free high-precision, offline-first client-side Conventional Commit tools with dynamic sliders and calculations.
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Protobuf Decoder
Free high-precision, offline-first client-side Protobuf Decoder tools with dynamic sliders and calculations.
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Receipt Generator
Free online client-side developer utility for receipt-generator.
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Working Capital Calculator
Free online client-side developer utility for working-capital-calculator.
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Xpath Validator
Free high-precision, offline-first client-side Xpath Validator tools with dynamic sliders and calculations.
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Docker Compose Validator
Free high-precision, offline-first client-side Docker Compose Validator tools with dynamic sliders and calculations.
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Dockerfile Linter
Free high-precision, offline-first client-side Dockerfile Linter tools with dynamic sliders and calculations.
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Eslint Config Generator
Free high-precision, offline-first client-side Eslint Config tools with dynamic sliders and calculations.
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Github Actions Validator
Free high-precision, offline-first client-side Github Actions Validator tools with dynamic sliders and calculations.
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Htaccess Validator
Free high-precision, offline-first client-side Htaccess Validator tools with dynamic sliders and calculations.
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Kubernetes Yaml Validator
Free high-precision, offline-first client-side Kubernetes Yaml Validator tools with dynamic sliders and calculations.
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Tsconfig Generator
Free high-precision, offline-first client-side Tsconfig tools with dynamic sliders and calculations.
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Toml Validator
Free high-precision, offline-first client-side Toml Validator tools with dynamic sliders and calculations.
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Xml Validator
Free high-precision, offline-first client-side Xml Validator tools with dynamic sliders and calculations.
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Css Validator
Free high-precision, offline-first client-side Css Validator tools with dynamic sliders and calculations.
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Canonical Url Checker
Free high-precision, offline-first client-side Canonical Url Checker tools with dynamic sliders and calculations.
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Meta Tag Generator
Free high-precision, offline-first client-side Meta Tag tools with dynamic sliders and calculations.
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Open Graph Generator
Free high-precision, offline-first client-side Open Graph tools with dynamic sliders and calculations.
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Robots Txt Validator
Free high-precision, offline-first client-side Robots Txt Validator tools with dynamic sliders and calculations.
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Sitemap Validator
Free high-precision, offline-first client-side Sitemap Validator tools with dynamic sliders and calculations.
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Twitter Card Generator
Free high-precision, offline-first client-side Twitter Card tools with dynamic sliders and calculations.
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Css Flexbox Generator
Free high-precision, offline-first client-side Css Flexbox tools with dynamic sliders and calculations.
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Css Grid Generator
Free high-precision, offline-first client-side Css Grid tools with dynamic sliders and calculations.
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Media Query Generator
Free high-precision, offline-first client-side Media Query tools with dynamic sliders and calculations.
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Svg To Base64
Free high-precision, offline-first client-side Svg To Base64 tools with dynamic sliders and calculations.
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Cors Header Generator
Free high-precision, offline-first client-side Cors Header tools with dynamic sliders and calculations.
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Http Cache Header Generator
Free online client-side developer utility for http-cache-header-generator.
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Http Header Analyzer
Free high-precision, offline-first client-side Http Header Analyzer tools with dynamic sliders and calculations.
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Http Headers Generator
Free high-precision, offline-first client-side Http Headers tools with dynamic sliders and calculations.
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Oauth Token Validator
Free high-precision, offline-first client-side Oauth Token Validator tools with dynamic sliders and calculations.
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Api Key Generator
Free high-precision, offline-first client-side Api Key tools with dynamic sliders and calculations.
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Api Key Hasher
Free high-precision, offline-first client-side Api Key Hasher tools with dynamic sliders and calculations.
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Api Key Validator
Free high-precision, offline-first client-side Api Key Validator tools with dynamic sliders and calculations.
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Bcrypt Hash Generator
Free high-precision, offline-first client-side Bcrypt Hash tools with dynamic sliders and calculations.
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Hmac Generator
Free high-precision, offline-first client-side Hmac tools with dynamic sliders and calculations.
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Json Web Key Generator
Free high-precision, offline-first client-side Json Web Key tools with dynamic sliders and calculations.
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Jwt Encoder Signer
Free high-precision, offline-first client-side Jwt Encoder Signer tools with dynamic sliders and calculations.
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Jwt Token Validator
Free high-precision, offline-first client-side Jwt Token Validator tools with dynamic sliders and calculations.
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Pgp Key Generator
Free high-precision, offline-first client-side Pgp Key tools with dynamic sliders and calculations.
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Rsa Key Generator
Free high-precision, offline-first client-side Rsa Key tools with dynamic sliders and calculations.
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Ssh Key Generator
Free high-precision, offline-first client-side Ssh Key tools with dynamic sliders and calculations.
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Totp Generator
Free high-precision, offline-first client-side Totp tools with dynamic sliders and calculations.
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Dns Record Validator
Free high-precision, offline-first client-side Dns Record Validator tools with dynamic sliders and calculations.
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Ip Allowlist Generator
Free high-precision, offline-first client-side Ip Allowlist tools with dynamic sliders and calculations.
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Random User Agent Generator
Free high-precision, offline-first client-side Random User Agent tools with dynamic sliders and calculations.
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Ssl Certificate Decoder
Free high-precision, offline-first client-side Ssl Certificate Decoder tools with dynamic sliders and calculations.
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Ssl Certificate Validator
Free high-precision, offline-first client-side Ssl Certificate Validator tools with dynamic sliders and calculations.
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Tls Cipher Checker
Free high-precision, offline-first client-side Tls Cipher Checker tools with dynamic sliders and calculations.
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Code Deobfuscator
Free high-precision, offline-first client-side Code Deobfuscator tools with dynamic sliders and calculations.
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Code Obfuscator
Free high-precision, offline-first client-side Code Obfuscator tools with dynamic sliders and calculations.
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Code To Curl Converter
Free high-precision, offline-first client-side Code To Curl Converter tools with dynamic sliders and calculations.
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Curl To Code Converter
Free high-precision, offline-first client-side Curl To Code Converter tools with dynamic sliders and calculations.
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Javascript Syntax Checker
Free high-precision, offline-first client-side Javascript Syntax Checker tools with dynamic sliders and calculations.
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Proportion Calculator
Free high-precision, offline-first client-side Proportion tools with dynamic sliders and calculations.
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Api Diff Checker
Free high-precision, offline-first client-side Api Diff Checker tools with dynamic sliders and calculations.
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Api Documentation Generator
Free high-precision, offline-first client-side Api Documentation tools with dynamic sliders and calculations.
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Api Error Decoder
Free high-precision, offline-first client-side Api Error Decoder tools with dynamic sliders and calculations.
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Api Mock Data Generator
Free high-precision, offline-first client-side Api Mock Data tools with dynamic sliders and calculations.
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Api Pagination Calculator
Free high-precision, offline-first client-side Api Pagination tools with dynamic sliders and calculations.
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Api Payload Analyzer
Free high-precision, offline-first client-side Api Payload Analyzer tools with dynamic sliders and calculations.
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Api Rate Limiter Calculator
Free high-precision, offline-first client-side Api Rate Limiter tools with dynamic sliders and calculations.
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Api Request Builder
Free high-precision, offline-first client-side Api Request Builder tools with dynamic sliders and calculations.
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Api Response Formatter
Free high-precision, offline-first client-side Api Response Formatter tools with dynamic sliders and calculations.
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Api Tester
Free high-precision, offline-first client-side Api Tester tools with dynamic sliders and calculations.
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Graphql Schema Validator
Free high-precision, offline-first client-side Graphql Schema Validator tools with dynamic sliders and calculations.
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Graphql Variables Formatter
Free high-precision, offline-first client-side Graphql Variables Formatter tools with dynamic sliders and calculations.
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Mock Api Response Generator
Free high-precision, offline-first client-side Mock Api Response tools with dynamic sliders and calculations.
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Openapi Mock Generator
Free high-precision, offline-first client-side Openapi Mock tools with dynamic sliders and calculations.
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Openapi Validator
Free high-precision, offline-first client-side Openapi Validator tools with dynamic sliders and calculations.
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Postman Collection Generator
Free high-precision, offline-first client-side Postman Collection tools with dynamic sliders and calculations.
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Postman To Openapi Converter
Free high-precision, offline-first client-side Postman To Openapi Converter tools with dynamic sliders and calculations.
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Soap Api Tester
Free high-precision, offline-first client-side Soap Api Tester tools with dynamic sliders and calculations.
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Swagger Openapi Generator
Free high-precision, offline-first client-side Swagger Openapi tools with dynamic sliders and calculations.
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Webhook Signature Verifier
Free high-precision, offline-first client-side Webhook Signature Verifier tools with dynamic sliders and calculations.
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Webhook Tester
Free high-precision, offline-first client-side Webhook Tester tools with dynamic sliders and calculations.
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Webhook Validator
Free high-precision, offline-first client-side Webhook Validator tools with dynamic sliders and calculations.
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Professional-Grade Developer Utilities

Our Developer Tools hub is built for engineers who value speed and privacy. We provide a suite of tools for data formatting, security debugging, and network calculations that run entirely in your browser.

Data Manipulation & Formatting

Whether you need to beautify minified JSON, convert between CSV and XML, or format complex SQL queries, our tools handle large datasets with ease and consistency.

Testing & Debugging

Debug your Regular Expressions with our live Regex Tester, parse complex Cron schedules into human-readable text, or safely decode JSON Web Tokens (JWT) to inspect claims locally.

Why ModernCalcs for Developers?

  • Zero Backend: We don't have a server-side for these tools. Your data is 100% private.
  • Modern UI: Clean, responsive interface designed for professional productivity.
  • No Signup Required: Fast access to tools without registration or login.
  • Instant Results: Leverages local compute for lightning-fast transformations.