JWT Decoder
Decode and inspect JSON Web Tokens (JWT) instantly. View header, payload claims, and check expiration status without sending data to any server.
Paste a JWT above to decode it
Your token is processed entirely in your browser
JWT Decoder & Inspector
Decode JSON Web Tokens instantly. Inspect headers, payload claims, and check token validity - all in your browser.
Features
100% Client-Side
Your JWT never leaves your browser. Complete privacy guaranteed.
Expiration Check
Instantly see if your token is expired or still valid.
Claim Labels
Standard claims are labeled for easy understanding.
Full Inspection
View header, payload, and signature parts separately.
How this JWT Decoder works
This JSON Web Token inspection tool decodes and analyzes JWT structure entirely within your browser—no data transmission occurs, ensuring complete privacy for sensitive authentication tokens. JWTs consist of three Base64URL-encoded segments separated by periods: header, payload, and signature.
The decoder splits the token, applies Base64URL decoding (handling padding and URL-safe character substitution), and parses the resulting JSON strings. Header inspection reveals the signing algorithm (HS256, RS256, ES256) and token type. Payload analysis displays registered claims with human-readable labels: issuer (iss), subject (sub), audience (aud), expiration time (exp), not before (nbf), issued at (iat), and JWT ID (jti).
Timestamp claims automatically convert to human-readable date formats showing both Unix values and localized DateTime representation. Expiration status calculates in real-time, displaying countdown until expiry or time since expiration. Visual indicators clearly distinguish valid tokens, expired tokens, and malformed input. The signature segment displays without verification—signature validation requires the secret key unavailable in client-side contexts.
How to use this JWT Decoder
Paste JWT
Enter your JSON Web Token in the input field above.
View Decoded Data
See the header, payload, and signature parts decoded.
Check Claims
Verify expiration, issuer, and other standard JWT claims.
Example Usage
Decoding a JWT to reveal its contents:
Frequently Asked Questions
Is it safe to paste my JWT here?
Can this tool verify JWT signatures?
What do the standard claims mean?
Why is my token showing as expired?
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The JWT Decoder is maintained by CodeItBro. We aim to provide the best free developer tools on the web. If you have feedback or suggestions, please visit our contact page.
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