Free cURL to JavaScript Converter Online - TestMu AI (Formerly LambdaTest)

What is cURL to JavaScript?

cURL to JavaScript is a free online converter that turns a cURL command into equivalent JavaScript HTTP request code. It reads the request method, URL, every -H header, the -d body, and -u basic auth, then rebuilds the same request in your chosen JavaScript client so you can run it from the browser or Node.js.

The tool emits six formats: the browser Fetch API, Axios, jQuery AJAX, XMLHttpRequest (XHR), the Node.js request library, and the built-in Node.js http and https modules. Parsing happens with the same tokenizer logic a shell uses, so flags and quoted values are read correctly. For a single library output, the cURL to Axios converter is the focused alternative.

How to use the cURL to JavaScript converter?

Converting a cURL command to JavaScript takes only a few seconds, and you do not need to install anything to use the converter itself. Follow these steps:

• Paste your cURL command: Drop the full command into the input box, including the URL, every -H header, the -d body, and any -u basic auth, in any order.
• Pick an output format: Use the Output format dropdown to choose Fetch, Axios, jQuery AJAX, XMLHttpRequest, the Node.js request library, or the Node.js http/https modules.
• Convert the request: Leave Auto Update on to generate the JavaScript instantly, or turn it off and press the Convert button to produce the HTTP request code.
• Review the generated code: Read the Output panel to confirm the HTTP method, headers, request body, and authentication were mapped into the chosen JavaScript client.
• Copy or download the snippet: Use the Copy button or download the code as a .js file to drop straight into your project.

All processing happens in your browser. No data is uploaded, so the URLs, headers, and credentials in your cURL command never leave your device.

Features of the cURL to JavaScript converter

As a tool, the cURL to JavaScript converter offers a few capabilities that make turning a request into code effortless. Here are the features of our converter:

• Six Output Formats: Generate Fetch, Axios, jQuery AJAX, XMLHttpRequest, Node.js request, and Node.js http/https code from a single cURL command.
• Automatic Method Detection: The converter reads -X or --request, and defaults to POST when a -d body is present without an explicit method, just like cURL.
• Header and Auth Mapping: Every -H header becomes a headers entry or setRequestHeader call, and -u basic auth maps to an Authorization header or auth option.
• Smart Body Handling: A -d payload is parsed as JSON when possible and emitted with JSON.stringify, otherwise kept as a raw string body.
• Browser-Based Processing: All conversion runs locally in your browser, so cURL commands containing tokens or cookies are never uploaded to a server.
• Copy and Download: The output is ready to paste, and you can download it as a .js file with no signup or usage limit.

Use cases of the cURL to JavaScript converter

Converting cURL to JavaScript is useful anywhere an HTTP request needs to move from the terminal into application code. The converter speeds up each of these workflows:

• API Docs to Code: Turn the cURL examples in API documentation into runnable Fetch or Axios calls in seconds, with headers and body intact.
• Test Automation: Convert a cURL command into a JavaScript request to seed an API check, then scale that suite across 3000+ browsers and 10,000+ real devices with the TestMu AI Test Manager.
• Bug Reproduction: Paste a customer-supplied cURL command and get JavaScript you can drop straight into a repro script or failing test.
• Framework Migration: Move a request from XHR or jQuery to Fetch or Axios without rewriting the headers, body, and auth by hand.
• Other Languages: When you need a different target, reach for the cURL to Python and cURL to PHP converters, or build a request from scratch with the cURL Builder.

This converter is maintained by TestMu AI (formerly LambdaTest), the team behind a unified testing platform, so it is shaped by the same focus on reliable, well-tested APIs that QA and development teams depend on every day.

Frequently Asked Questions (FAQs)

What is a cURL to JavaScript converter?

A cURL to JavaScript converter translates a cURL command into JavaScript HTTP request code, mapping the method, URL, headers, request body, and basic auth into the syntax of Fetch, Axios, jQuery, XHR, or Node.js.

Which JavaScript formats does this tool support?

The tool generates six output formats: the browser Fetch API, Axios, jQuery AJAX, XMLHttpRequest (XHR), the Node.js request library, and the built-in Node.js http and https modules.

Does the cURL to JavaScript converter run in my browser?

Yes. All parsing and conversion happen in your browser with client-side JavaScript, so your cURL command, URLs, headers, and tokens never leave your device or get uploaded to a server.

Can it convert headers, request body, and authentication?

Yes. Every -H header is mapped to the target format, JSON and raw bodies from -d are converted to the correct body field, and basic auth from -u is mapped to an Authorization header or auth option.

What is the difference between Fetch and Axios output?

Fetch is the built-in browser API and needs no install, while Axios is a library that must be imported and returns parsed JSON automatically. The converter emits idiomatic code for each so you can pick the one your project uses.

Does the generated code work in Node.js?

Yes. The Axios output runs in both the browser and Node.js, and the Node.js (request) and Node.js (http/https) outputs are built specifically for server-side use with require statements.

Does it detect the HTTP method automatically?

Yes. The converter reads the -X or --request flag, and when a -d body is present without an explicit method it defaults to POST, matching how cURL itself behaves.

Is the cURL to JavaScript converter free?

Yes, the converter is completely free with no signup, subscription, or credit card required, and you can copy or download the generated JavaScript as a .js file.