Fetch to cURL Converter

Convert JavaScript and Node.js Fetch requests into clean, executable terminal cURL commands instantly in your browser.

At a glance

Fetch to cURL Converter is a free developer utility that transforms JavaScript Fetch API requests into ready-to-run terminal cURL commands. It parses HTTP methods, target URLs, request headers, Bearer tokens, cookies, and JSON request bodies 100% client-side in browser memory with zero network requests or data transmission.

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Developer Suite: Fetch to cURL cURL to Fetch Axios to cURL cURL to Axios cURL to PowerShell cURL to JSON HAR to cURL

100% Client-Side Fetch to cURL Converter

Zero Server Uploads

Transform JavaScript Fetch API requests, Request init objects, headers, and payloads into ready-to-run terminal cURL commands directly in browser memory without sending private API tokens or bodies to any server.

Local Sandbox
Presets:
0 lines • 0 chars
Output Options
Waiting for input
Detected Method GET
Headers Count 0
Body Payload None

Why Use This Fetch to cURL Converter?

100% Client-Side Privacy: Your Fetch code, Bearer tokens, and request payloads never leave your browser.
Full Fetch API Syntax Support: Accurately parses fetch(url), fetch(url, options), and raw RequestInit objects.
Payload Handling: Seamlessly formats JSON.stringify, raw objects, and URLSearchParams form data into cURL -d payloads.
Header & Auth Mapping: Automatically converts headers dictionaries, Bearer tokens, and credentials: include flags.
Multiline Bash Formatting: Produces clean multiline commands with backslash (\) continuations or compact single-line commands.
Instant Export: One-click copy to clipboard and downloadable .sh shell script generation.

How to Use Fetch to cURL Converter

1

Paste Fetch Request

Paste your JavaScript fetch() call, async-await snippet, or RequestInit object into the code editor.

2

Configure Options

Toggle multiline bash formatting with backslash continuations or compact single-line output.

3

Copy or Download cURL

Click Copy Command or Download .sh to run your converted HTTP request directly in any terminal.

Converting JavaScript Fetch POST Request to cURL Command

Demonstrates converting an authenticated JavaScript Fetch POST request with JSON payload into an executable terminal cURL command with proper headers and payload flags.

JavaScript Fetch Request Source 
fetch('https://api.example.com/v1/users', {
  method: 'POST',
  headers: {
    'Content-Type': 'application/json',
    'Authorization': 'Bearer secret123'
  },
  body: JSON.stringify({
    name: 'Alice Johnson',
    role: 'developer'
  })
});
Executable cURL Command Processed 
curl -X POST "https://api.example.com/v1/users" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer secret123" \
  -d '{"name":"Alice Johnson","role":"developer"}'

Technical Specifications & Engine Details

Technical specifications and engine details for Fetch to cURL Converter
Specification Details
Supported Formats JAVASCRIPT, TYPESCRIPT, TEXT → TEXT, SH, CURL
Execution Mode 100% Client-Side In-Browser (client)
Browser Requirements Modern browser with JavaScript enabled.
Performance Constraints 100% Client-Side. Runs locally in browser JavaScript memory.
Maintained by Pragyan Pahadi

100% Client-Side Privacy Guarantee

All Fetch code and request credentials are processed entirely in local browser memory. Zero data transmitted.

Frequently Asked Questions

How does the converter handle JSON.stringify() bodies in fetch()?
The converter evaluates or extracts the JSON argument from JSON.stringify({ ... }), preserves the nested JSON structure, adds -H "Content-Type: application/json", and passes the payload via cURL's -d flag wrapped in clean shell quotes.
Are private API keys and Bearer tokens kept secure?
Yes, absolutely. The conversion executes 100% client-side in your browser's local JavaScript memory. No network requests are made, and zero code or header credentials ever touch an external server.
Can I convert URLSearchParams form data?
Yes. When body is initialized with new URLSearchParams(...), the engine encodes key-value pairs into application/x-www-form-urlencoded format and outputs an appropriate cURL -d argument.
Does this tool support raw JavaScript RequestInit objects without fetch()?
Yes. You can paste an options object like { method: 'POST', headers: { ... }, body: ... } directly and the tool will generate the equivalent terminal cURL command.

Methodology

This tool runs entirely in your browser. The example above shows a representative input and the result it produces.

Last updated .

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