Free Online API Request Converter

The Fetch API is a modern, native browser interface introduced in ES2015 (ES6) for making HTTP network requests. Unlike the older XMLHttpRequest (XHR), Fetch uses a clean Promise-based design that integrates naturally with async/await syntax. Fetch supports configurable request objects with headers, method, credentials, body, and CORS mode. It is built into all modern browsers and Node.js 18+, meaning no external package is required. The main limitation is that Fetch does not automatically throw errors for HTTP error codes (like 404 or 500) — you must manually check response.ok.

Axios is a lightweight, isomorphic promise-based HTTP client library that works identically in both browser JavaScript and Node.js environments. It was created to solve common pain points with native Fetch: automatic JSON serialization/deserialization, built-in request and response interceptors, configurable timeout support, upload/download progress tracking, request cancellation with AbortController, and automatic error throwing for HTTP 4xx/5xx responses. Axios is especially favored in React, Angular, and Vue projects for its cleaner syntax, enterprise-grade reliability, and rich ecosystem of plugins.

Paste your Curl command (e.g., curl -X POST https://api.example.com/data -H "Content-Type: application/json" -d '{"name":"test"}') into the Input Code editor, select "Curl Command" as the Convert From format, and select "Fetch API" as Convert To. The converter instantly parses the Curl flags (-X, -H, -d, --header, --data), extracts the URL, HTTP method, headers, and body, then generates clean async/await Fetch code with proper JSON.stringify() wrapping and response handling.

The API Request Converter uses smart pattern recognition to identify your input format automatically. It scans the beginning of your pasted code: if it starts with the keyword "curl" or "curl.exe", it identifies Curl. If it detects "fetch(" or "await fetch", it selects Fetch API. If it finds "axios.get", "axios.post", "axios(", or similar Axios method signatures, it identifies Axios. The detected format is shown as a green badge next to the "Auto-detect input type" toggle. You can also disable auto-detection and manually choose your input format from the dropdown.

Yes! This API converter supports all six bidirectional conversion paths: Curl → Fetch, Curl → Axios, Fetch → Curl, Fetch → Axios, Axios → Curl, and Axios → Fetch. Simply select your source format in the "Convert From" dropdown and your target format in "Convert To". You can also click the 🔄 Swap button to instantly reverse the conversion direction and load the output back as the new input.

Absolutely secure. This API Request Converter operates 100% client-side in your web browser. All parsing, pattern matching, code generation, and formatting logic runs locally as JavaScript in your browser tab. No data — including your API URLs, authorization bearer tokens, API keys, request headers, body parameters, or any other sensitive payload — is ever transmitted to any external server, database, or third-party service. You can safely use it with private API credentials.

The converter supports all standard HTTP methods: GET, POST, PUT, PATCH, DELETE, and HEAD. It correctly handles custom request headers (including Authorization, Content-Type, Accept, X-API-Key, etc.), JSON request bodies, form-encoded data, multipart file upload payloads, query string parameters, basic auth, bearer token authentication, and cookie headers. The output code includes proper async/await patterns, try-catch error handling, and JSON response parsing for maximum production-readiness.