Decode JWT Tokens Instantly Online
Inspect and validate JWT tokens securely in your browser. Our free JWT decoder helps you understand token headers, payloads, and verify signatures.
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Try our JWT Validator for comprehensive security checks, signature verification, and advanced token validation.
Instantly decode and validate JWT (JSON Web Token) online - completely free, with no registration required. Our tool processes everything in your browser, ensuring your tokens remain private and secure. Perfect for developers who need quick, reliable JWT inspection and validation.
Whether you're debugging authentication issues or learning about JWT structure, our instant JWT decoder provides immediate results with support for all algorithms. No account needed, no data stored, and 100% secure browser-based processing.
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What is a JWT Token?
A JSON Web Token (JWT) consists of three parts:
- Header: Contains token type and signing algorithm
- Payload: Holds the token's claims (data)
- Signature: Verifies token authenticity
JWT Decoder Examples
Basic Authentication Token:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
Decoded Parts:
Header:
{
"alg": "HS256",
"typ": "JWT"
}Payload:
{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}Advanced Token with Claims:
eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IjEyMzQ1In0.eyJzdWIiOiJ1c2VyMTIzIiwibmFtZSI6IkFsaWNlIFNtaXRoIiwiZW1haWwiOiJhbGljZUBleGFtcGxlLmNvbSIsInJvbGVzIjpbImFkbWluIiwidXNlciJdLCJwZXJtaXNzaW9ucyI6WyJyZWFkIiwid3JpdGUiXSwiZXhwIjoxNzM1Njg5NjAwLCJpYXQiOjE3MDQwNjcyMDAsImlzcyI6Imh0dHBzOi8vYXV0aC5leGFtcGxlLmNvbSJ9.signature
Decoded Parts:
Header:
{
"alg": "RS256",
"typ": "JWT",
"kid": "12345"
}Note: RS256 uses RSA signature with SHA-256, commonly used in production environments. The 'kid' (Key ID) helps identify which key to use for verification.
Payload:
{
"sub": "user123",
"name": "Alice Smith",
"email": "alice@example.com",
"roles": [
"admin",
"user"
],
"permissions": [
"read",
"write"
],
"exp": 1735689600,
"iat": 1704067200,
"iss": "https://auth.example.com"
}exp: Token expiration time (January 1, 2025)
iat: Token issued at (January 1, 2024)
iss: Token issuer
roles & permissions: Common claims for authorization
Common JWT Claims Explained
Registered Claims
- iss (Issuer): Who created and signed the token
- sub (Subject): Who the token refers to
- exp (Expiration Time): When the token becomes invalid
- nbf (Not Before): When the token starts being valid
- iat (Issued At): When the token was created
- jti (JWT ID): Unique identifier for the token
Common Custom Claims
- name: User's full name
- email: User's email address
- roles: User's role assignments
- permissions: Specific access rights
- org: Organization identifier
- scope: OAuth 2.0 scopes
Common JWT Use Cases
Authentication
JWTs are commonly used for user authentication and maintaining session state. Decode tokens to verify user claims and permissions.
API Authorization
Inspect JWT tokens used in API requests to debug authorization issues and validate access rights.
Information Exchange
Use JWTs to securely transmit information between parties as JSON objects with optional signature verification.
Single Sign-On (SSO)
Debug SSO implementations by decoding tokens to understand user sessions and authentication states.
JWT Decoder Features
- Decode JWT tokens instantly in your browser
- Validate token expiration (exp) and issuance (iat) dates
- Inspect header claims and algorithms
- Pretty-print payload data for readability
- Copy decoded values to clipboard
- 100% secure, browser-based processing
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