Decode any JWT token instantly to view header, payload, and signature. Signature verification is NOT performed; decode safely.
A JWT (JSON Web Token) Decoder is a tool that allows you to inspect the contents of a JWT token. JWTs are widely used for authentication and information exchange in web applications.
Decoding a JWT helps developers, testers, and security analysts view the header, payload, and signature of a token without verifying its signature. This is useful for debugging APIs, testing authentication flows, or analyzing payload data safely.
✔ Quickly inspect JWT header, payload, and signature
✔ Debug API authentication tokens
✔ Examine claims such as userId, email, roles, and expiration (exp)
✔ Safe and fast online — no signup or download required
✔ Decode any JWT token instantly
✔ Displays header, payload, and signature separately
✔ Supports HS256, RS256, and other standard JWT algorithms
✔ Safe to use online — no data stored
✔ Simple and user-friendly interface
✔ Supports multiple JWTs for testing
✔ Warning included: signature is NOT verified
Three-Part Structure
A JWT is always in three parts separated by dots (.):
Header → Metadata about the token (algorithm, type)
Payload → Claims or data (userId, roles, expiration)
Signature → Verifies the token (not decoded by this tool)
Header & Payload are Base64Url Encoded
The first two parts (header & payload) are encoded in Base64Url, which can be decoded without the secret key. Only the signature requires verification.
Dot Format Makes JWT Compact
The three-part dot format allows JWTs to be compact, URL-safe, and easily transmitted in HTTP headers like Authorization: Bearer <token>.
How to Use JWT Decoder
Copy your JWT token and paste it into the input box.
The tool instantly decodes your JWT and displays the header and payload.
Check claims like userId, name, email, iat, exp, and other custom fields. The header shows the algorithm and token type.
Decode any JWT token instantly to view header, payload, and signature. Signature verification is NOT performed; decode safely.
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