How to use the Fetch → cURL Converter
1. Paste JavaScript fetch() code in the left panel — method, headers, and body are all parsed.
2. Click Convert — the equivalent cURL command is generated on the right, ready to paste in your terminal.
What is it?
fetch() is the modern JavaScript HTTP API, while cURL is the standard command-line HTTP tool. Converting between them is a common task when sharing API requests with backend developers, documenting endpoints, or debugging in a terminal. This tool parses the URL, method, headers, and body from your fetch() call and produces a clean, multi-line cURL command.
Benefits
Know exactly who and what is visiting your app
User agent parsing reveals browser name, version, operating system, device type, and whether a request comes from a real user or a bot — essential for analytics, feature flags, and traffic analysis.
Convert curl commands to ready-to-use fetch code
Paste any curl command — from browser DevTools, documentation, or Stack Overflow — and get the equivalent JavaScript fetch API call, ready to drop into your application.
Catch server misconfiguration before users do
Inspect HTTP response headers for missing CORS policies, incorrect Content-Type values, broken cache directives, and absent security headers like CSP and HSTS.
Test API endpoints in the browser without Postman
Send GET, POST, PUT, and DELETE requests with custom headers, bodies, and query parameters directly in your browser — no installation, no account, no context switching.
Frequently asked questions
What about async/await wrapping?
The converter only needs the fetch() call itself. The async/await wrapper, .then() chains, and response.json() calls are ignored.
Can it handle FormData bodies?
Currently only JSON.stringify() and string bodies are supported. FormData conversion requires knowing the form fields at parse time.