cURL Converter — Free Online Tool cURL Converter: free online tool with examples and documentation. Convert, generate, format, or analyze data instantly in your browser.
Use this free online cURL Converter directly in your browser. No signup required, no data leaves your device. Part of Utilier — a collection of 133+ developer utilities.
What is cURL Converter? Converts cURL commands into equivalent code for multiple languages and libraries: JavaScript fetch, Axios, Python requests, Go http, PHP cURL, Java HttpClient, Rust reqwest, and more. A cURL command describes a complete HTTP request through options for its URL, method, headers, body, authentication, and redirects. The generated snippet preserves those request details in the conventions of the selected library, making it easier to reproduce API experiments in application code.
cURL is a command-line HTTP client whose flags describe a request: URL, method, headers, cookies, body, authentication, and redirects. A converter translates that request into the equivalent calls for client libraries such as fetch, Axios, or Python requests, helping move a successful terminal experiment into application code. Generated code should still have secrets removed and error handling adapted for the target application.
Why use curl fetch? When debugging APIs with cURL, you often need to translate the working cURL command into your application's language. This tool does the conversion instantly, handling headers, body, auth, and options.
When to use curl fetch Use when you have a working cURL command from documentation or network tools and need to implement it in your codebase. Supports complex cURL flags like -H, -d, -X, --data-raw, -u, etc.
How to use curl fetch Simple steps to use this tool effectively.
Enter input: Paste or type your input data into the input area. Supports various formats and encodings.Configure options: Select format, encoding, or other options as needed. Sensible defaults are provided for quick start.Process data: Click the convert, generate, or format button. Many tools show real-time results as you type.Review output: Check the output for correctness. Validation errors are shown if any issues are detected.Copy or export: Click copy button to clipboard or download results as a file for use in your project.Try examples: Use provided examples to understand features and learn common patterns and use cases.Key features Fast processing: Quick and accurate curl fetch operations with instant results.Input validation: Validates input format and provides helpful error messages and suggestions for fixes.Multiple formats: Supports various input and output formats for maximum compatibility and flexibility.Built-in examples: Includes common use case examples to help you get started quickly and learn.Copy & export: Easy copying to clipboard or downloading results as files for use in projects.Real-time updates: See results instantly as you type or change options. No need to click buttons.Client-side privacy: All processing happens in your browser. No data is uploaded to servers or stored.Comprehensive docs: Detailed documentation, specifications, FAQs, and troubleshooting help included.Common use cases Web development: Use curl fetch during coding, debugging, and testing web applications.API integration: Test API requests and responses, validate data formats, debug integration issues.Data conversion: Convert between different data formats, encodings, or representations as needed.Learning & education: Understand concepts through interactive examples, experimentation, and documentation.Documentation: Create clear examples and code samples for technical documentation and guides.Troubleshooting: Debug issues in development or production by validating, converting, or analyzing data.Quick prototyping: Rapidly test ideas, generate sample data, or validate approaches without writing code.Examples Convert cURL to various programming languages.
cURL to fetch curl -X POST https://api.com/users -H 'Content-Type: application/json' -d '{"name":"John"}'fetch('https://api.com/users', { method: 'POST', headers: {'Content-Type': 'application/json'}, body: JSON.stringify({name: 'John'})
})Technical reference cURL Converter specifications, standards, and technical details.
Standards compliance Follows industry standards, specifications, and best practices for compatibility and correctness. Input formats Supports common input formats used in web development, APIs, and data interchange. Output formats Provides multiple output format options for different use cases and requirements. Character encoding Handles UTF-8 and other character encodings correctly for international text support. Browser support Works in all modern browsers: Chrome, Firefox, Safari, Edge. Requires JavaScript enabled. Performance Optimized for fast processing of typical workloads. Large inputs may take longer depending on device. Security & privacy Client-side processing only. No data is uploaded to servers, stored, or transmitted externally. Accuracy Validated against test suites, specifications, and real-world examples to ensure correctness. Limitations Handles typical use cases efficiently. Extremely large inputs (megabytes) may be slower or hit browser limits. Updates Regularly updated with new features, improvements, bug fixes, and user-requested enhancements. Common mistakes to avoid Missing auth headers cURL's -u flag (basic auth) translates to an Authorization header with Base64-encoded credentials. Verify the conversion includes your auth method.
Frequently asked questions What cURL flags are supported? -X (method), -H (header), -d/--data/--data-raw (body), -u (basic auth), -k (insecure), -L (follow redirects), -I (HEAD), and more.
Privacy and availability Runs entirely in your browser — zero server processing No signup or account required Works offline once loaded Fast, lightweight, no external dependencies Available as a browser extension for Chrome and Firefox Tags HTTP API Related tools API Tester — Lightweight REST, GraphQL & WebSocket client with auth, body types, query params, and request history.JSON Beautifier & Validator — Format, minify and validate JSON. Reports the exact error location.URL Encode / Decode — Percent-encode or decode text and query components, in any character set.TOML Converter — Convert TOML to JSON or YAML and JSON/YAML back to TOML, with validation.ASCII Converter — Convert text to and from character codes in decimal, hexadecimal or binary.All developer tools JSON Beautifier & Validator — Format, minify and validate JSON. Reports the exact error location.HTML Beautifier & Minifier — Indent or minify HTML. 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