JWT Workbench

Encode, decode, and manage JWTs with reusable projects and a secret library

**JWT Workbench is a private JWT encoder, decoder, and signature verifier built for Chrome's side panel.** Keep it open beside your app, API console, docs, or logs while you inspect bearer tokens, edit claims, re-sign payloads, and verify signatures. Everything runs locally in your browser: tokens, payloads, projects, and signing secrets are never uploaded or sent to a server. **ENCODE AND RE-SIGN TOKENS** • Edit JWT headers and payloads as JSON with live syntax highlighting. • Choose HS256, HS384, or HS512 and see the signed token update as you type. • Add an `exp` claim with one click using presets from 5 minutes to 1 year. • Copy the finished token instantly for API requests, tests, or debugging. **DECODE AND VERIFY** • Decode a JWT from your clipboard with one click, or paste a token manually. • View clean, highlighted header and payload JSON. • Read `exp`, `iat`, and `nbf` claims as human-friendly timestamps. • Spot expired tokens quickly with an "Expired" badge. • Verify signatures against a saved or pasted secret and get a clear result. **SAVE REUSABLE PROJECTS** Stop rebuilding the same test tokens from scratch. Save a header, payload, algorithm, and secret as a named project, reopen it later, tweak a claim, and copy a fresh token. You can create, save, duplicate, rename, and delete projects as your environments change. **MANAGE SIGNING SECRETS LOCALLY** Store reusable secrets with friendly names like "staging-api" or "auth-service" and select them from the encoder or decoder. Secrets are stored with `chrome.storage.local` on this browser profile and are not synced or transmitted. **WHY DEVELOPERS USE IT** • Side panel workflow: no tab switching to an online decoder. • Local by design: no tracking, no uploads, no remote code. • Useful for backend, frontend, QA, support, and API debugging. • System light/dark theme and a clean, focused interface. JWT Workbench is made for anyone who works with authentication tokens and wants a fast, private tool close at hand.