cURL & Regex Code Generator
Convert cURL requests and regex patterns into six target languages.
256 KiB limit. Input and generated code stay in this tab and are never executed.
Generated request code may embed tokens, cookies, or API keys from the source. Browser Fetch is also subject to CORS and forbidden-header rules that do not apply to native cURL.
Generated source
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Choose a source and target, then generate explicitly. Generated code is displayed as text only.
Working notes
Use cURL & Regex Code Generator with the boundary visible.
cURL & Regex Code Generator parses bounded cURL commands or regex patterns as text and emits equivalent starting-point code without executing the source command.
What is cURL & Regex Code Generator?
cURL is the de facto standard for describing HTTP requests in documentation, API references, and developer communities. Every API documentation page includes cURL examples, and developers regularly copy cURL commands from browser DevTools network panels. However, translating a cURL command into your programming language of choice requires understanding the mapping between cURL flags (-H for headers, -d for body, -X for method) and your language's HTTP library. This tool automates that translation: paste a cURL command and get equivalent code in JavaScript (fetch), TypeScript, Python (requests), Java (HttpClient), Dart (http), or C#. The regex mode works similarly — enter a regular expression pattern and flags, and get compiled regex code for any of the six languages. Both modes parse the input as text only: no HTTP request is executed, no shell command runs, and no code is evaluated. The generated code is a starting point that handles the common cases; you may need to add error handling, authentication, retry logic, or project-specific dependencies.
When to use it
- Converting API documentation examples — paste cURL commands from REST API docs to get equivalent fetch() or requests code for your project.
- Porting browser network panel requests — copy a request as cURL from Chrome or Firefox DevTools and convert it to your backend language.
- Sharing cross-language examples — generate the same HTTP request in multiple languages for API documentation or tutorials.
- Regex code generation — write and test a regex pattern, then generate compiled regex code for your target language.
- Learning HTTP library APIs — see how cURL flags map to method calls, headers, and body configuration in different languages.
How to use it
- 01Choose cURL request mode or regular-expression mode.
- 02Paste a cURL command (including flags like -H, -d, -X) or a regex pattern with flags.
- 03Select the target language: JavaScript, TypeScript, Python, Java, Dart, or C#.
- 04Review the generated code. It handles method, URL, headers, and body from cURL; pattern and flags from regex.
- 05Copy the code and add project-specific error handling, authentication, and configuration.
Common mistakes
- cURL commands with shell-specific syntax — pipes (|), variable expansion ($VAR), and subshells are not parsed. Paste the raw cURL command without shell wrappers.
- Missing authentication — the generated code includes headers from the cURL command, but authentication tokens may be expired or specific to your session. Update credentials before running.
- File upload flags — cURL's -F (form) and --data-binary @file flags reference local files that the tool cannot read. The generated code includes a placeholder for the file content.
- Generated code is a starting point — it does not include error handling, retry logic, connection pooling, or production-grade configuration. Add these based on your project's requirements.
- Regex flavor differences — the pattern you test may not work identically in every language. Named groups, lookbehind support, and flag behavior differ between JavaScript, Python, Java, and Go.
Synthetic example
Translate a simple request
Input
curl https://api.example.test/health
Result
const response = await fetch('https://api.example.test/health')Related standards
Limits and data boundary
- File-reading cURL arguments and shell execution are rejected.
- Generated code may require project-specific error handling, authentication, and dependency choices.
Frequently asked questions
- Which languages can I convert cURL commands to?
- JavaScript (fetch), TypeScript, Python (requests), Java (HttpClient), Dart (http), and C# (HttpClient). Each output is a dependency-free starting point.
- Does the tool execute the cURL command?
- No. The cURL command is parsed as text. No HTTP request is made and no shell command is executed.
- Can I convert regex patterns to code?
- Yes. Switch to regex mode, enter a pattern and flags, and the tool generates compiled regex code for the same six languages.
- How do I copy a cURL command from my browser?
- In Chrome or Firefox DevTools, open the Network tab, right-click a request, and choose "Copy as cURL." Paste the result into this tool.
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