Free Online JWT Decoder and Analyzer
Decode, verify, and analyze JSON Web Tokens (JWT) quickly and easily. Our free online tool supports all JWT types and provides detailed token information. No registration required!
What is JWT?
JWT stands for JSON Web Token. It's an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. JWTs are commonly used for:
- Authentication: Once the user is logged in, each subsequent request will include the JWT, allowing the user to access routes, services, and resources that are permitted with that token.
- Information Exchange: JWTs are a good way of securely transmitting information between parties because they can be signed, which ensures that the senders are who they say they are.
A JWT typically consists of three parts separated by dots (.):
- Header: Contains the type of token and the hashing algorithm used.
- Payload: Contains claims (statements about the user and additional metadata).
- Signature: Ensures that the token hasn't been altered. The party that creates the JWT signs the header and payload with a secret key.
How to Use the JWT Decoder
- Paste your JWT into the input box on the left
- Click the "Decode JWT" button
- View the decoded header, payload, and signature on the right
- Copy the decoded information if needed
JWT Decoding Tips
- Always keep your JWT secret key secure and never share it
- Verify the expiration time (exp) in the payload to ensure the token is still valid
- Check the issuer (iss) and audience (aud) claims to confirm the token's origin and intended recipient
- Be cautious with sensitive information in JWTs as the payload is easily decoded
- Use HTTPS to transmit JWTs to prevent interception
- Implement token refresh mechanisms for long-lived sessions