HTTP & API tools

Convert cURL commands, inspect URLs, headers and cookies, and look up status codes. Every tool runs in your browser, so nothing you add is uploaded.

Reference

Plain-English explanations of HTTP status codes, with fixes for common errors.

HTTP Status Codes

Explains every common HTTP status code in plain language, with what to do about errors.

cURL converters

Turn cURL commands into fetch, axios or Python requests code.

cURL to Python

Converts cURL commands into Python code using the requests library.

cURL to fetch

Converts cURL commands into JavaScript fetch code, including headers, JSON bodies, forms and auth.

cURL to axios

Converts cURL commands into Node.js code using axios.

Inspect requests

Break down URLs, headers, cookies, user agents and Basic auth credentials.

URL Parser

Breaks a URL into its parts and decodes every query parameter, flagging tracking parameters.

User Agent Parser

Identifies the browser, rendering engine, operating system and device type from a user agent string.

Headers Analyzer

Explains HTTP response headers and checks for missing security headers and version leaks.

Cookie Parser

Parses Cookie and Set-Cookie headers, explains every attribute and flags insecure or broken cookies.

Basic Auth Header

Creates an HTTP Basic Authorization header from a username and password, and decodes existing ones.

About HTTP & API tools

Helpers for working with web requests and APIs: turn cURL commands copied from your browser or API docs into JavaScript, Python or Node.js code; break down URLs, cookies and user agents; check a site’s security headers; and look up what any HTTP status code means.

Commands and headers often contain tokens and session cookies, so everything is analysed locally in your browser and nothing is sent to our servers.

Frequently asked questions

Can these tools fetch a URL for me?

No. Fetching another site would need a server in the middle. Paste the command, URL or headers instead, and everything is analysed locally.