Auth Tool

JWT Token Decoder

Instantly decode and inspect JSON Web Tokens. View header, payload, expiry status, security warnings, and all standard JWT claims 100% runs in your browser.

3 Parts

Header · Payload · Signature

100%

Private & Offline

Live

Expiry Countdown

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JWT Token Input

Samples:

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Paste a JWT Token Above

Paste any JWT token to decode its header and payload, check expiry status, view security warnings, and inspect all claims with explanations.

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What is a JWT Decoder?

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Instant Decoding

Paste any JWT and instantly see the decoded header and payload with all claims clearly labeled.

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Live Expiry Countdown

See exactly how long until your token expires with a live countdown timer. Red when expired, green when valid.

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Security Warnings

Automatic detection of dangerous configurations like alg:none and weak algorithms with clear explanations.

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Claims Inspector

Every standard JWT claim (sub, iss, aud, exp, iat) is labeled and explained with hover tooltips.

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100% Private

All decoding happens in your browser. Your tokens are never sent to any server safe for production tokens.

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Export Decoded JSON

Download the full decoded token as a formatted JSON file for documentation or debugging.