REST client
Send HTTP requests with headers, body, and query params. Inspect the response headers and JSON body.
Free browser dev tools
Developer tools
Everyday utilities every developer opens a dozen tabs for — bundled into one editor, running fully in your browser.
JWT decoder
Paste a JSON Web Token to see its header, payload, and signature — all decoded locally.
Base64 encoder / decoder
Encode text or files to base64, and decode base64 back to text or a downloadable blob.
Hash generator
Compute SHA-1, SHA-256, SHA-512, and MD5 digests of any input, in the browser.
UUID generator
Generate v4 UUIDs individually or in bulk.