JWT Decoder Online

Decode and inspect JWT tokens instantly. View header, payload, claims, and expiry information. Free JWT decoder — nothing sent to any server.

Decode Header Decode Payload Expiry Check Issued At 100% Client-Side

Paste JWT token

Header

Payload

Quick reference

What it is

Decodes JWT strings to reveal the header, payload claims, and checks if the token has expired — all in the browser.

How to use it

Paste your JWT token into the input
Header and Payload decode automatically as you type
Expiry and issued-at times appear below if present
The tool shows whether the token is expired or still valid

When you need this

Debugging an authentication issue in your API
Checking what claims are inside a token
Verifying when a token was issued and when it expires
Understanding what a third-party service sends in its JWT

Good to know

A JWT has 3 parts separated by dots: header.payload.signature
This tool only decodes — it cannot verify the signature
Never share JWT tokens publicly — they may contain session data
The exp claim is a Unix timestamp of when the token expires

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