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AiTechWorlds
AiTechWorlds
Build and sign JWT tokens with HS256 using Web Crypto API — header, payload, and secret.
Header
Payload
Standard Claims
Custom Claims
Secret
The JWT Builder creates signed JSON Web Tokens using HMAC-SHA256 (HS256) entirely in your browser via the Web Crypto API. Set the payload claims (sub, iat, exp, and custom key-value pairs), enter your signing secret, and get a properly signed JWT. Pairs with the JWT Decoder tool for verification.
Set claims
Add key-value pairs to the payload. Enable iat (issued at) and exp (expiry) as needed.
Enter secret
Type your HMAC secret, or click Generate to create a random one.
Sign the token
Click Sign JWT to generate the signed token. Copy it to use in your application.
100% Private — No Server Required
All processing happens directly in your browser. No data is uploaded, stored, or transmitted to any server.