JWT Builder — Free Online Developer Tools

JWT Builder

Build and sign a JSON Web Token. All signing runs in your browser.

Algorithm

Header (auto-updated)

{
  "alg": "HS256",
  "typ": "JWT"
}

Payload

{
  "sub": "1234567890",
  "name": "Alice Papadopoulou",
  "email": "alice@example.com",
  "iat": 1700000000,
  "exp": 9999999999
}

Secret key (for HMAC)

Secret is Base64-encoded

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