cURL to Fetch
About Tool
Modern web development has largely moved toward the fetch() API for making network requests, but most documentation and API examples are still provided as cURL commands. Translating a complex cURL command—complete with headers, authentication tokens, and JSON payloads—into a clean JavaScript function can be a repetitive and error-prone task. This converter automates that transition, providing you with ready-to-use JavaScript code in seconds.
The utility parses the different flags of a cURL command, such as -X for the method, -H for headers, and -d for the body. For developers who are dealing with authentication headers that require encoding, the Base64 Encoder and Decoder is a great resource. Additionally, if your cURL command includes complex URLs with many query parameters, you can use the URL Encoder and Decoder to ensure the endpoints are correctly formatted for the final script.
Generating Fetch Boilerplate
By pasting your command into the "cURL Command" area and clicking "Convert to Fetch," you receive a "Fetch JavaScript Code" block that includes the fetch() call, a headers object, and the body if applicable. This output is formatted for readability, making it easy to drop into your React, Vue, or vanilla JS project. It handles JSON content types automatically, adding the necessary JSON.stringify() calls to ensure your data is sent correctly to the server.
Efficient API Testing
This tool is particularly useful when you have successfully tested a request in your terminal or a tool like Postman and are ready to move that logic into your frontend. It eliminates the guesswork of mapping cURL flags to JavaScript objects. The "Copy Fetch" button ensures you can get back to your code editor without manual re-typing, allowing for a faster and more fluid development workflow.
Frequently Asked Questions
Does it support cookies and credentials?
The converter will attempt to map header flags like '-b' or '--cookie', but you may need to manually add the 'credentials: "include"' property to your fetch object depending on your security needs.
Will it handle multi-line cURL commands?
Yes, as long as the lines are separated by the standard backslash (\) character, the tool will parse them as a single command.
Does it support the 'fetch' options like 'mode' or 'cache'?
This tool generates the core request logic (method, headers, body). You can easily append specific fetch options like 'mode: "cors"' to the resulting object.
Can I convert Fetch back to cURL?
This utility is a one-way converter designed to help you bring terminal-based commands into the browser environment.
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