JWT Decoder
Decode and inspect JSON Web Tokens — view header, payload, and expiry. Free, fast, and runs 100% in your browser.
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JWT Decoder
Decode and inspect JSON Web Tokens — view header, payload, expiry, and claims.
About JWT Decoder
The ZamDev JWT Decoder lets you decode and inspect JSON Web Tokens (JWTs) instantly in your browser. Paste any JWT and see the decoded header, payload, and signature in a clean, formatted view. Check token expiration timestamps, inspect claims like issuer and audience, and verify token structure — all without sending your token to any server. Essential for debugging authentication flows in web applications.
How It Works
- 1Paste your JSON Web Token (JWT) into the input field.
- 2The token is instantly decoded into its three parts: header, payload, and signature.
- 3View the decoded header showing algorithm and token type.
- 4Inspect the payload with all claims including expiration (exp), issued-at (iat), and custom claims.
- 5Check if the token is expired based on the exp claim timestamp.
Key Features
Lightning Fast
Processes instantly with zero server delays
100% Private
Your data never leaves your device
No Sign-up Required
Use this tool instantly — completely free
Works Everywhere
Compatible with all modern browsers and devices
Common Use Cases
Debugging OAuth 2.0 and OpenID Connect authentication flows
Inspecting JWT claims returned by API endpoints
Verifying token expiration during development and testing
Understanding JWT structure when learning about web authentication
Checking audience, issuer, and scope claims in access tokens
Troubleshooting SSO and identity provider integrations
Frequently Asked Questions
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