Code to Curl Converter: Turn fetch() Into a Shareable Command
Reproducing a request outside your app — for a teammate, a bug report, or a quick terminal test — usually means hand-copying the URL, headers, and body from a fetch() call into curl syntax, then fixing the quoting. This tool parses your fetch() call directly (evaluating the URL and options as real JavaScript expressions) and generates a correctly-quoted curl command.
The URL and options arguments are evaluated as JavaScript, so expressions like JSON.stringify(...) resolve to their actual computed value.
Why Real Evaluation Beats Regex Matching
A regex-based extractor would struggle with something like `body: JSON.stringify({ name: 'Jane' })` — it can't compute what that expression actually produces. By evaluating the isolated expression instead, this tool gets the true resulting string, the same way your browser would when it actually calls fetch().
Shell-Safe Quoting
Every value going into the generated curl command — the URL, header values, the body — is wrapped in properly-escaped single quotes, so values containing spaces, special characters, or embedded quotes still produce a curl command that runs correctly when pasted into a terminal.
Practical Examples
Sharing a Bug Repro
Turning a failing fetch() call into a curl command for a teammate.
- 1.Paste the fetch() call
- 2.Copy the generated curl command
- 3.Share it in a bug report — no app context needed to run it
What's Preserved
- HTTP method (explicit or inferred from body presence)
- All headers from a plain object or Headers instance
- Request body, whether a literal string or an object to stringify
Good Use Cases
- Reproducing a frontend request in a terminal for debugging
- Sharing a runnable request example in a bug report
- Testing a request outside your application's error handling
- Documenting an API call for teammates on any stack
Frequently Asked Questions
How does this parse my fetch() code?
It locates the fetch(...) call, splits its arguments respecting nested braces/brackets/strings, then evaluates the URL and options expressions as JavaScript — so real expressions like JSON.stringify({...}) inside your code are actually computed, not just pattern-matched.
Why does it require literal values instead of variables?
The tool only evaluates the fetch() call's arguments in isolation — it doesn't have access to variables defined elsewhere in your file, so a call like fetch(myUrl, myOptions) can't be resolved. Paste the literal URL string and options object directly for it to work.
Does it support Axios or XMLHttpRequest?
Not currently — only the native fetch() function is parsed. Axios and XHR have different call signatures that would need separate parsing logic.
Is evaluating my code with the Function constructor safe?
It only parses and evaluates the isolated URL/options expressions from your own pasted snippet locally in your browser — nothing is sent anywhere, and no network requests are made from the evaluation itself.
What happens to the request body?
If body is already a string (common when you call JSON.stringify(...) yourself), it's used as-is for curl's -d flag. If body is a plain object, it's JSON-stringified automatically.