JWT Decoder

Decode JSON Web Tokens and inspect header, payload, and expiry claims instantly in your browser

JWT Token

Header (decoded)

Payload (decoded)

JWT Decoding Tips

A JWT is three Base64URL-encoded parts joined by dots: header.payload.signature.
Decoding only reveals the contents — the signature is not verified without the secret key.
Never paste production tokens into tools that run on a server. This decoder runs 100% in your browser.
The exp claim is a Unix timestamp in seconds; this tool converts it to your local time automatically.

Fonctionnalités professionnelles de traitement JWT Decoder

Tout ce dont vous avez besoin pour travailler avec les données JWT Decoder efficacement et professionnellement

Structure Validation

Instantly checks the header.payload.signature format and reports malformed tokens with a clear error message.

Formatted JSON Output

Decoded header and payload are pretty-printed with two-space indentation, ready to read or copy.

Expiry Panel

exp, iat, and nbf claims are converted to your local time with a valid/expired badge at a glance.

UTF-8 Safe

Non-ASCII claim values such as names in other languages decode correctly thanks to proper UTF-8 handling.

Instant Decoding

Long-lived access tokens and refresh tokens decode in milliseconds with zero network activity.

Zero Setup

No installs, no accounts, no extensions. Open the page, paste, and decode.

Comment ça marche

Des étapes simples pour traiter vos JWT Decoder comme un pro

Paste Your Token

Copy the JWT from your request header, cookie, or logs and paste it into the input area.

Click Decode

The header and payload are Base64URL-decoded and formatted as JSON instantly.

Inspect the Claims

Read the algorithm, subject, scopes, and the expiry panel showing whether the token is still valid.

Copy & Continue

Copy the decoded payload JSON for debugging, documentation, or support tickets.

Formateur et validateur JWT Decoder professionnel

Utilisé par des millions de développeurs dans le monde pour un traitement JWT Decoder fiable

Conçu par des experts

Our JWT decoder implements the RFC 7519 structure directly in your browser: it splits the JWS compact serialization, Base64URL-decodes the header and payload, and renders the claims as formatted JSON. The expiry panel turns raw Unix timestamps into your local time so you can tell at a glance whether a token is still valid.

Fonctionnalités techniques clés :

• Full Base64URL decoding with proper UTF-8 and padding handling
• Human-readable expiry panel for exp, iat, and nbf claims
• Instant formatting of decoded header and payload JSON
• Client-side processing - tokens never leave your device
• Supports HS256, RS256, ES256 and all other JWS algorithms

Fiable & Sécurisé

Trusted by developers who handle authentication daily. Because decoding happens entirely on your machine, access tokens, refresh tokens, and ID tokens are never transmitted anywhere — which is exactly how a JWT inspector should work.

Sécurité & Confidentialité :

• 100% client-side decoding - no server uploads, ever
• No tracking, cookies or token logging
• HTTPS encryption for secure connections
• Signature is displayed but never verified remotely
• GDPR and CCPA compliant approach

Pourquoi les professionnels choisissent EZ Formatter

99.9%

Fiabilité de disponibilité

<100ms

Temps de traitement moyen

10M+

Fichiers JWT Decoder traités mensuellement

Rejoignez des millions de développeurs qui font confiance à notre formateur JWT Decoder pour leur flux de travail quotidien. Inscription non requise, entièrement gratuit et conçu avec le respect de la vie privée.

Questions fréquentes

Réponses aux questions courantes sur le formatage Jwt Decoder

Yes, it is completely free with no registration required. All decoding happens in your browser.

No. Decoding is not verification: without the secret or public key, a signature cannot be checked. This tool shows the signature as-is so you can inspect it, but treats the claims as unverified data, which is the correct behavior for a client-side decoder.

Never. The decoder is plain JavaScript running on this page. Your token is not transmitted, logged, or stored — close the tab and it is gone.

The exp, iat, and nbf claims are Unix timestamps in seconds, converted to your local timezone. If the result looks wrong, check that your device clock and timezone are set correctly.

Unsigned tokens with alg "none" decode fine. Encrypted JWE tokens (five-part tokens) are not supported, since decryption requires the key.