JWT Decoder & Encoder - Free Online Tool
Decode and inspect JSON Web Tokens (JWT) with our free online tool.
👉 JWT Decoder
📚 Complete JWT Guide
What is JWT?
JWT (JSON Web Token) is an open standard for securely transmitting information between parties as a JSON object. JWTs are commonly used for authentication and information exchange.
JWT Structure
A JWT consists of three parts separated by dots (.):
xxxxx.yyyyy.zzzzz
│ │ │
│ │ └── Signature
│ └── Payload (Claims)
└── Header
1. Header
{
"alg": "HS256",
"typ": "JWT"
}
2. Payload (Claims)
{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022,
"exp": 1516242622
}
3. Signature
The signature is used to verify the message wasn’t changed along the way.
Common JWT Claims
| Claim | Name | Description |
|---|---|---|
iss |
Issuer | Who issued the token |
sub |
Subject | Who the token is about |
aud |
Audience | Who the token is intended for |
exp |
Expiration | When the token expires |
iat |
Issued At | When the token was issued |
nbf |
Not Before | Token not valid before this time |
Why Use Our JWT Decoder?
- Instant decoding - Paste a token and see the contents immediately
- Expiration check - See if your token is expired
- Secure - All processing happens in your browser
- No signup required - Free and open access
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