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JWT Builder / Generator (HS256)

Create and sign a JWT with HMAC-SHA256 — handy for generating test tokens. Signing happens locally.

Creates an HS256-signed JWT token from your payload and secret — useful when you need a test token for an API.

How to use JWT Builder (HS256)

  1. Enter the payload (JSON).
  2. Enter the secret.
  3. Click generate and copy the JWT.

Frequently asked questions

Should this token be used in production?

It's best suited for testing and development. For production, generate tokens from a backend system with secure key management.

Related tools

JWT Decoder Decode the header and payload of a JSON Web Token. Warns about expiration. Does not verify the signature (offline). JWT Verify (HS256) Verify a JWT's HMAC-SHA256 signature using your secret — locally, so the secret never leaves your browser. Hash (SHA) Compute SHA-1/256/384/512 hashes using the Web Crypto API, entirely on your device. Base64 Encode/Decode Encode/decode Base64 with full UTF-8 support (works correctly with any language). Password / Token Generate strong passwords and secret tokens (API keys, NEWS_INGEST_TOKEN, etc.) using secure crypto — nothing leaves your browser. MD5 Hash Compute the MD5 checksum of text (pure JS implementation, since Web Crypto doesn't support MD5).
🔒 JWT Builder / Generator (HS256) runs entirely in your browser — the data you enter is not sent to any server. Free, no sign-up required. See145 free dev tools more.