Web & API Tools

Build and debug HTTP requests, convert cURL to code, inspect headers, decode JWTs and work with OpenAPI, GraphQL and Open Graph.

The Web & API group is for the boundary between your code and something else's server. That is where most debugging time goes: the request that works in Postman and fails in code, the JWT whose expiry you misread because it is in seconds, the OpenAPI spec that is not quite Swagger 2.0, the OG tags that render a blank card in Slack.

Start with the API request builder when you need to construct or inspect a request, and with cURL to code when someone hands you a working cURL command and you need it as Python, JavaScript or Go. The header analyser explains what each request header does rather than just listing them, which is the difference between copying a working config and understanding why it works. JWT decoder shows the header, claims and expiry side by side so you can spot the classic errors - seconds versus milliseconds, and a signature you cannot verify without the key.

Two notes. Decoding a JWT is not verifying it: the tool shows you the claims and says plainly that the signature cannot be checked without the secret. And when a social preview looks wrong, paste the page URL into the Open Graph preview before you change anything - the tag is usually missing, not misconfigured.

12 tools in this category

• Open Graph Preview Tool — Preview your page on Facebook, X, LinkedIn & WhatsApp with per-platform truncation
• API Request Builder — Build HTTP requests with headers, query params, JSON/form bodies & auth, exported as
• cURL to Code Converter — Convert cURL to Python, JavaScript, Go & 6 more languages in your browser.
• Wget and cURL Command Builder — Build wget or cURL download commands with headers, basic/Bearer/API-key auth, output
• HTTP Status Code Lookup — Every HTTP status code with causes and fixes.
• HTTP Request Header Analyzer — Inspect HTTP request headers (raw capture or cURL) with plain-English explanations of
• OpenAPI / Swagger Viewer — Explore OpenAPI 3.x / Swagger 2.0 specs in your browser: endpoints, parameters, auth
• GraphQL Query Builder — Build, validate & format GraphQL queries/mutations in your browser: syntax
• JWT Decoder & Inspector — Decode JWTs to inspect header, claims, expiry, issuer & signature with a built-in
• Regex Tester — Test regexes with live highlighting, groups & plain-English explanation.
• Regular Expression Library — Browse, test & copy 36 ready-made regex patterns (email, dates, log parsing
• Commit Message Helper — Write conventional-commit messages with type, scope and body prompts.

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