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Decode JWT tokens locally, verify signatures, inspect claims, track expiry, and save tokens in an encrypted vault. 🔐 The JWT debugger that never sends your token anywhere. Every time you paste a token into an online jwt debugger or a site like jwt.io, that token leaves your machine. Tokens are live credentials: they carry user emails, roles, and session ids. JWT Vault is the jwt debugger built as a Chrome extension, so you can decode jwt tokens, verify signatures, and read claims entirely inside your browser. Nothing is ever sent to a server. 🚀 🔒 WHY DEVELOPERS TRUST THIS JWT DEBUGGER JWT Vault decodes and verifies every JSON Web Token locally with the browser's built-in Web Crypto API. There is no backend, no logging, and no third-party script. This jwt debugger is locked down with a Content Security Policy that blocks every outbound connection except an anonymous license check. If you have ever felt that small pang of doubt pasting a production token into a web jwt decoder, this is the jwt debugger you have been looking for. ⚡ EVERYTHING IN THE FREE PLAN (FREE FOREVER) The free jwt debugger handles the daily work, with no account and no sign-in: ✓ Unlimited JWT decode: paste a token, or right-click selected text on any page to decode jwt instantly ✓ Full header, payload, and signature breakdown with clean, collapsible formatting ✓ Claims explorer that explains every standard claim (iss, sub, aud, exp, iat, nbf) in plain English ✓ Live expiry countdown and an unmissable valid or expired badge, the fast answer to "is this token still good?" ✓ Automatic "Bearer " and quote stripping: paste a whole Authorization header and the jwt decoder just works ✓ One-click copy of the full payload or any individual claim ✓ Dark mode and a clean, full-width layout ✓ Save up to 3 tokens in an on-device vault 🔓 WHAT PRO UNLOCKS ✦ Local signature verification: check an HS256 secret or an RS256, ES256, or PS256 public key with the Web Crypto API, and your key never leaves the browser ✦ Unlimited encrypted vault: save and label every test token with color-coded dev, staging, and prod tags ✦ Expiry dashboard: see at a glance which saved tokens are expired or expiring soon ✦ Diff two tokens side by side to spot exactly what changed between them ✦ Generate and sign test JWTs for local testing ✦ Team vault sharing through an end-to-end encrypted blob we cannot read 🎯 WHO IT IS FOR Backend and API developers, QA and security engineers, and anyone working with OAuth, OpenID Connect, or any JSON Web Token auth flow. If you decode jwt tokens and debug authentication for a living, this jwt debugger replaces the online jwt decoder you keep bookmarked and the extra browser tab you leave open all day. 🛠️ HOW THE JWT DEBUGGER WORKS 1. Copy a JWT from your network tab, your logs, or a request header 2. Paste it into JWT Vault, or select it on any page and right-click "Decode JWT with JWT Vault" 3. Read the decoded header and payload, the live expiry, and the plain-English claims 4. Optionally verify the signature with your key, then save the token to your vault 💡 REAL USE CASES → Decode jwt payloads from a failing API call and see exactly why the request was rejected → Confirm an access token has the right scopes and roles before you ship → Catch an expired token in seconds with the live jwt expiry checker → Verify a jwt signature locally while you rotate signing keys → Keep labeled dev, staging, and prod tokens side by side instead of re-copying them all day 🔒 PRIVACY YOU CAN VERIFY This is not a promise on a page, it is enforced by the browser. JWT Vault requests only the minimum permissions, has no access to the sites you visit, your history, or page content, and its Content Security Policy forbids sending your token data anywhere. Decode jwt, verify, and store, all without your secrets leaving the device. That is the whole point of a local jwt debugger. 📊 BUILT FOR SPEED A jwt debugger should feel instant, and this one does. Decoding works fully offline, the whole jwt decoder is only a few kilobytes, and there is no network round-trip between you and a decoded token. 🆚 WHY THIS OVER OTHER JWT DECODERS ✓ Unlike jwt.io and other online tools, your token never leaves the browser, which makes JWT Vault a true jwt.io alternative when you need to decode jwt data safely ✓ Unlike a basic jwt decoder, this jwt debugger adds local signature verification, an expiry dashboard, and an encrypted vault ✓ Unlike network-sniffing extensions, the jwt decoder needs no broad permissions to read your tabs ✓ Unlike tools owned by identity vendors, JWT Vault is independent and collects nothing 🛡️ SECURITY JWT Vault is a Manifest V3 jwt debugger with zero remote code. Every line of the jwt decoder that touches your token ships inside the extension and runs on your machine. The encrypted vault is protected by a passphrase-derived key. ❓ FREQUENTLY ASKED QUESTIONS Q: Is JWT Vault really a fully local jwt debugger? A: Yes. Both the decode and the signature verification run in your browser. The only network call is an anonymous license check, never your token. Q: How do I decode a JWT? A: Paste it into the popup, or select a token on any page and right-click "Decode JWT with JWT Vault". The decode jwt step is instant and unlimited on the free plan. Q: Can I verify a jwt signature? A: Yes. Pro adds local signature verification for HS256, RS256, ES256, and PS256 using your own secret or public key, which never leaves the browser. Q: Is this a good jwt.io alternative? A: That is exactly why it exists. You get the same decode and verify workflow as a popular online jwt decoder, without sending a live credential to a third-party site. Q: Does the jwt decoder store my tokens? A: Only if you choose to. Saved tokens go into an encrypted vault on your device. The free plan includes 3 slots, and Pro is unlimited. Q: Does it work offline? A: Yes. The jwt debugger and the jwt decoder both run offline, and the only network call is an anonymous license check. You can decode jwt tokens on a plane with no connection at all. 🚀 GET STARTED Add JWT Vault, paste your first token, and watch it decode jwt instantly. It is the fastest, most private jwt debugger for Chrome, the jwt debugger that keeps every token on your device. One click and you are decoding.