JWT Decoder API
Category: developer
Decode and inspect JSON Web Tokens (JWT). View header, payload, and verify expiration. Runs entirely in the browser.
Endpoint
N/A
Browser API (atob)
No Server API
Response
Content-Type: N/A
This tool decodes JWTs in the browser using base64 decoding. No server-side API is available.
// Browser-only: uses atob() for base64 decoding
cURL Example
# No cURL equivalent — this tool runs in the browser
Code Samples
// JWT decoding in JavaScript
function decodeJwt(token) {
const parts = token.split('.');
const header = JSON.parse(atob(parts[0]));
const payload = JSON.parse(atob(parts[1]));
return { header, payload };
}
const decoded = decodeJwt('eyJhbG...');
console.log(decoded);
# JWT decoding in Python:
import jwt
decoded = jwt.decode(token, options={'verify_signature': False})
print(decoded)
// JWT decoding in Java (using jjwt): // Jws<Claims> claims = Jwts.parser() // .setSigningKey(key) // .parseClaimsJws(token); // System.out.println(claims.getBody());