Free developer tools

No sign-up and no tracking of what you type — every tool does its work inside your browser tab.

Runs in your browser; nothing is uploaded.

• JSON Formatter, Validator & Minifier

  Format, minify, sort and validate JSON in your browser, with exact error line and column, big-number warnings and one-click copy or download.

• JWT Decoder — Inspect, Verify & Check Expiry

  Decode a JWT's header, payload and expiry, verify HS256/384/512 or RS/ES signatures with WebCrypto, and flag alg-none tokens. Nothing leaves your browser.

• HMAC Signature Tester for Webhooks (SHA-1/256/512)

  Compute and compare HMAC-SHA1/256/512 signatures for GitHub, Stripe, Shopify, Meta and Slack webhooks in your browser. Your secret never leaves the page.

• cURL Command Converter — Go, PHP, Node & Python

  Paste a curl command and convert it to Go, PHP, Node or Python, keeping headers, auth and body. It is parsed locally and never executed or sent anywhere.

• HTTP Status Codes Reference

  Look up any HTTP status code's meaning, common causes, whether to retry, and its defining RFC section — searchable and filterable by 1xx-5xx class.

• Base64 & URL Encoder/Decoder

  Encode or decode Base64, Base64url and percent-encoded URLs with full UTF-8 support, exact error positions and file-to-data-URI conversion in your browser.

• API directory

  Public APIs worth knowing — auth type, free tier, Pakistan relevance and when we last checked the official docs.