JWT (JSON Web Token) Decoder
Cryptography & Hashes100% Client-SideDecode and inspect JWT header, payload claims, expiration time, and signature algorithm safely in your browser.
Encoded JWT Token
Status:Token Active
Expires at: 1/15/2027, 8:00:00 AM
Header (Algorithm & Token Type)
{
"alg": "HS256",
"typ": "JWT"
}Payload (Claims & Data)
{
"sub": "1234567890",
"name": "DevToolkit User",
"admin": true,
"iat": 1725000000,
"exp": 1800000000
}Signature
SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
SponsorNon-intrusive
What is JWT (JSON Web Token) Decoder?
JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This tool parses and pretty-prints the Header, Payload claims, and Signature with visual expiration status.
Key Features
Color-coded breakdown: Header (Red), Payload (Purple), Signature (Cyan)
Formatted readable timestamps for exp (Expires), iat (Issued At), and nbf (Not Before)
Live token expiration badge (Active vs Expired)
100% Client-side decoding — tokens are never transmitted to any server
Common Use Cases
- Debugging authentication issues in Single Page Applications
- Inspecting user roles, permissions, and scopes inside token payloads
- Verifying token expiration times
Frequently Asked Questions
No. Decoding reads the public claims inside the token. Verifying checks the cryptographic signature using the secret or public key to ensure it has not been tampered with.
SponsorNon-intrusive