JWT Generator & Decoder
Generate signed JWTs with custom payloads using HS256/HS384/HS512. Decode any JWT token and inspect header, payload, and signature — runs in your browser.
JWT Generator & Decoder
The JWT Generator creates signed JSON Web Tokens using the browser's built-in Web Crypto API. Choose an algorithm, enter your secret, configure payload claims, and get a production-ready signed token instantly.
Generator
Supports HMAC algorithms: HS256, HS384, and HS512. Add any custom claims with string, number, or boolean types. Standard claims like iat and expare pre-filled automatically.
Decoder
Paste any JWT to instantly decode its header and payload. The tool performs base64url decoding without making network requests. Signature verification is not performed in the decoder tab — use the Generator tab with a known secret for that purpose.
Security
All cryptographic operations use the browser's SubtleCrypto API. Your secret key and token never leave your device.