Decode, verify, and generate JSON Web Tokens, which are an open, industry standard RFC 7519 method for representing claims securely between two parties.
{
"alg": "HS256",
"typ": "JWT"
}{
"sub": "1234567890",
"name": "John Doe",
"admin": true,
"iat": 1516239022
}Enter the secret used to sign the JWT below:
Last updated: August 8, 2026
Decode, verify, and encode JSON Web Tokens instantly in your browser. Inspect the header and payload, and check the signature against a secret.
A: No. Decoding, encoding, and signature verification all run locally in your browser using the jose library — your token and secret never leave your device.
A: Yes, for HS256 (HMAC) tokens: enter the signing secret and the tool checks it against the token signature and reports whether it is valid.
A: A JWT's header and payload are only Base64URL-encoded, not encrypted, so anyone can decode and read them. The secret is required only to verify (or create) the signature, not to view the contents.
A: Decoding just reads the Base64URL-encoded header and payload — no secret needed. Verifying additionally checks the signature against your secret to confirm the token was signed correctly and has not been tampered with.
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