개발자 도구
JWT Generator
Generate signed JSON Web Tokens (JWT) with HS256 using the WebCrypto API, right in your browser
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Security notice: Never include sensitive data in a JWT payload. JWTs are base64url-encoded, not encrypted — anyone can decode them. All signing happens locally in your browser.
Header
{
"alg": "HS256",
"typ": "JWT"
}
Payload
Quick-add standard claims:
Signature
Use a strong, random secret of at least 32 characters for HS256.
HMACSHA256(
base64UrlEncode(header) + "." +
base64UrlEncode(payload),
your-secret-key
)
base64UrlEncode(header) + "." +
base64UrlEncode(payload),
your-secret-key
)
Generated Token
Click "Generate JWT" to create a token
About JWT
- •JWTs consist of three Base64URL-encoded parts separated by dots.
- •HS256 uses a shared secret — keep it safe on your server.
- •The payload is readable by anyone — do not store passwords or PII.
- •Always set an
expclaim to limit token lifetime.
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