JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and check expiration!
Paste a JWT token to decode
Features
- Decode JWT tokens
- View header & payload
- Check expiration
- Timestamp conversion
- Copy decoded data
- No server upload
How to Use
- 1Paste your JWT token
- 2View decoded header
- 3Inspect payload claims
- 4Check expiration status
About JWT Decoder
JSON Web Tokens (JWT) are the industry standard method for securely transmitting information between parties as a JSON object. When developing or debugging modern web applications, APIs, or mobile apps, you will frequently need to inspect these tokens. Our free online JWT decoder lets you instantly unpack the encoded header and payload of any JSON Web Token without writing a single line of code.
Designed with security in mind, this JWT parser tool runs entirely in your local browser environment. The token payload—which often contains sensitive user IDs, roles, and timestamps—is decoded instantly using JavaScript without ever being sent over the network to a distant server. With built-in features like Unix timestamp conversion for token expiration (exp) and issue dates (iat), you can effortlessly debug your authentication logic securely and quickly.
Frequently Asked Questions
Is my token uploaded?
No! Decoding happens entirely in your browser. Your tokens stay private.
Does this verify the signature?
No, this only decodes the token. Verification requires the secret key.
What is the exp claim?
Expiration time - a Unix timestamp when the token becomes invalid.
Why use JWT?
JWTs are compact, self-contained tokens for authentication and information exchange.