🛠️DevTools

JWT Decoder & Encoder

Decode and inspect JWT tokens or create new JWTs. View header, payload, and verify signatures. Fast, free, browser-based.

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💡 Tip: JWT tokens consist of three parts: Header (algorithm info), Payload (claims/data), and Signature (verification). This tool decodes the header and payload but cannot verify signatures without the secret key.

Related JWT Tools

JWT Decoder JWT Encoder JWT Parser JWT Debugger JWT Viewer

How to Use

Select 'Decode' to inspect a JWT token, or 'Encode' to create one
Paste your JWT token or JSON payload in the input field
Click Run to process the token
View the decoded header, payload, and signature
Copy the result using the Copy button

Example

Input

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c

Output

{
  "header": {
    "alg": "HS256",
    "typ": "JWT"
  },
  "payload": {
    "sub": "1234567890",
    "name": "John Doe",
    "iat": 1516239022
  },
  "signature": "SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c"
}

FAQ

What is a JWT token?

JWT (JSON Web Token) is a compact, URL-safe way to represent claims between two parties. It consists of three parts: header, payload, and signature, separated by dots.

Is it safe to decode JWTs here?

Yes, all processing happens in your browser. Your JWT is never sent to any server. However, never share sensitive JWTs publicly.

Can this tool verify JWT signatures?

This tool decodes and displays JWT contents. Signature verification requires the secret key, which should never be shared in a browser tool.

What's the difference between decode and encode?

Decode extracts the header and payload from an existing JWT. Encode creates a new JWT from JSON data (without a valid signature for security).

JWT Examples

Basic JWT Token Example

See how to decode a basic JWT token with standard claims. Learn the structure of JWT header and payload.

JWT Expiration Check Example

Learn how to check if a JWT token is expired by examining the exp claim in the payload.

Auth0 JWT Token Example

Decode a typical Auth0 JWT token with common claims like issuer, audience, and permissions.

Firebase JWT Token Example

Decode a Firebase Authentication JWT token and understand its claims structure.

API Key JWT Example

Decode a JWT-based API key and see how API permissions and scopes are encoded.

Refresh Token JWT Example

Understand refresh token JWT structure with longer expiration and token family claims.

RS256 Signed JWT Example

Decode a JWT signed with RS256 (RSA) algorithm. See the key ID (kid) in the header.

Create JWT Payload Example

Learn how to create a JWT token from JSON payload data for testing purposes.

📚 Learn More

What is JWT (JSON Web Token)?

Learn what JWT (JSON Web Token) is, how it works, why it's used for authentication, and see examples in JavaScript, Python, and more. Complete beginner-friendly guide.

Related Tool Collections

Encoding Tools Online JWT Decoder Online JWT Encoder Online JWT Parser - Parse JWT Token Structure JWT Debugger - Debug JWT Issues Online

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