cURL to Fetch Converter

cURL is the universal HTTP client for terminals, but most JavaScript/TypeScript projects use fetch() (built-in browsers, Node 18+), axios, or node-fetch. Converting lets you copy API examples from documentation, Stack Overflow, or AI assistants — which commonly use cURL — directly into your JS code without manually translating headers, methods, and body formats.

fetch() is built into modern browsers and Node.js 18+ with no dependencies. It returns a Response object — you must call .json() or .text() manually, and non-2xx responses don't throw by default. axios is a library that auto-parses JSON, throws on non-2xx status codes, supports request/response interceptors, has built-in timeout support, and works consistently across environments. For simple use cases, fetch() is fine; for complex API clients, axios adds convenience.

When the cURL -d flag contains a JSON string (starting with '{' or '['), or when the Content-Type header is application/json, the converter auto-detects it as JSON. For fetch/axios, it wraps the body with JSON.stringify() and preserves the object structure. For form-encoded data (application/x-www-form-urlencoded or --data-urlencode), it keeps it as a raw string.

The -u user:pass flag gets converted to an Authorization: Basic header with the base64-encoded credentials. In JavaScript, this is btoa('user:pass'). The converter encodes it directly and includes it in the headers object, so the output works without additional libraries.

Yes. cURL commands split across multiple lines with backslash continuations (\) are normalized before parsing. You can paste the full multi-line command and it will be processed correctly.

Flags that don't have a direct HTTP equivalent are silently ignored: -L (follow redirects — fetch does this by default), -v (verbose), -s (silent), -k (insecure — fetch has no direct equivalent, use node-fetch with rejectUnauthorized for Node.js), -i (include headers in output), and timing flags like --max-time. If you need these behaviors, configure them separately in your HTTP client.