JWT Decoder — Decode JSON Web Tokens
Paste any JWT to instantly decode the header and payload. See all claims (sub, exp, iat, etc.) in readable JSON. Browser-only — your token never leaves your device.
JWT Decoder
Decode JSON Web Token header & payload
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "John Doe",
"iat": 1516239022
}How to use this tool
1. Enter your input. Use the form above — all processing happens in your browser, no data is sent to any server.
2. View the result. The output appears instantly below the input. Copy any value with one click.
3. Explore related tools. See the related tools section below for adjacent calculators and converters.
4. Bookmark this page. This tool runs entirely client-side, so it works offline once loaded. Add it to your bookmarks for quick access.
Frequently Asked Questions
Everything you need to know about this currency pair
A JWT is a compact, URL-safe token format used for authentication and authorization in web applications. It consists of three Base64-encoded parts separated by dots: header.payload.signature. The header specifies the algorithm, the payload contains claims (user ID, roles, expiration), and the signature proves the token wasn't tampered with.