Free Online JWT Decoder (Inspect Token Claims & Expiration)
Safely decode and inspect JSON Web Tokens. Verify expiration dates, subject, issuer, and custom claims client-side without exposing secrets to any external server.
100% Client-Side Inspection Notice
Decoding a JWT decodes Base64Url payload claims in your browser. Decoding is NOT cryptographic signature verification. A decoded token can still be expired, altered, or forged without verifying the secret key.
HEADER: Algorithm & Token Type
PAYLOAD: Data Claims
SIGNATURE (Raw Hash)
How to Use This Tool – JWT Decoder
Paste JWT Token
Paste any JSON Web Token (header.payload.signature) into the input box.
Inspect Decoded Header & Claims
Review formatted JSON showing algorithm, token expiration, subject, and custom claims.
Verify Expiration & Timestamps
Check human-readable expiration dates (exp), issued-at (iat), and not-before (nbf) timings.
Key Features & Capabilities – JWT Decoder
Zero Token Leakage
Crucial for security: your secret authentication tokens are never sent to external servers.
Color-Coded Token Highlighting
Visual separation between Header (red), Payload (purple), and Signature (blue).
Automatic Expiration Status
Calculates active vs expired token status with exact countdown and readable UTC times.
JSON Beautifier & Copy
One-click copy for decoded payload claims formatted in standard 2-space JSON.
Frequently Asked Questions
Is it safe to decode production tokens here?
Does this tool verify token signatures?
What formats are supported?
Can I decode expired tokens?
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