JWT Decoder & Inspector
A powerful and free online tool to handle JWT Decoder & Inspector operations instantly in your browser. Fast, secure, and fully local by OrbitInfra.
Decoded header JSON will appear here...Decoded payload JSON will appear here...📜 Recent Decoded JWT History
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Inspecting JSON Web Tokens (JWT) and Authentication Claims
JSON Web Tokens (JWT, RFC 7519) are the standard mechanism for stateless authorization across modern Single Page Applications (SPAs) and microservices. A JWT consists of three Base64URL-encoded parts separated by dots: Header, Payload, and Signature.
Our online JWT Decoder parses these segments instantly, formats the JSON claims cleanly, and translates UNIX timestamps (like `exp`, `iat`, and `nbf`) into human-readable local dates and times.
How to Use
- Paste your raw JWT string into the input panel.
- The tool automatically splits the token at the dot (`.`) boundaries and decodes each segment.
- Inspect the Header (algorithm, token type) and Payload claims (user ID, roles, permissions).
- Review expiration status with color-coded badges indicating if the token is active or expired.
Key Features & Capabilities
- Color-coded token segmentation: Header (red), Payload (purple), Signature (blue).
- Automatic conversion of epoch timestamps (`exp`, `iat`, `nbf`) to readable dates.
- Clear expiration badge warning if the token has passed its expiry window.
- 100% private client-side decoding—your sensitive security tokens are never uploaded.
Common Developer Workflows
- Debugging user authentication flows in OAuth 2.0 and OpenID Connect systems.
- Verifying token scopes, user roles, and custom claims during API development.
- Diagnosing session timeouts and invalid token errors in client applications.
- Inspecting Firebase, Auth0, Supabase, or AWS Cognito access tokens.
Frequently Asked Questions
Does decoding a JWT require a secret key?
No. The Header and Payload of a JWT are only Base64URL-encoded, not encrypted. Anyone who has the token can decode and read its claims without the signing key.
Is it safe to paste production JWTs into this tool?
Yes! Our tool runs entirely in your local browser sandbox and never transmits tokens over the network. However, as a general security best practice, avoid sharing production tokens containing sensitive credentials.
Does this tool cryptographically verify the signature?
This utility is an inspector that decodes the payload for debugging. Signature verification requires your private key or secret, which should remain safely on your backend server.
