JSON Web Token (JWT) is a compact, URL-safe means of representing claims to be transferred between two parties. It contains a header, payload, and signature.

Is decoding a JWT safe?

Yes. Decoding a JWT only reveals its header and payload; it does not prove authenticity. Signature validation is required to trust the token.

How do I decode a JWT token?

Paste your token into the JWT decoder tool and it will automatically decode the Base64URL header and payload.

What is a JWT token used for?

JWT tokens are used for authentication, API authorization, single sign-on (SSO), and secure information exchange.

Can I decode JWT without a secret key?

Yes. Decoding does not require a key, but validating the signature does.

What happens if a JWT is expired?

If the exp claim is in the past, the token should be rejected by secure systems.

Does this tool validate JWT signatures?

It supports local HS256 (HMAC-SHA256) signature validation. For RS256 (public key) validation, upload or paste the public key in PEM format.

Does this tool send my tokens to a server?

No. All decoding and validation are performed locally in your browser. No data is uploaded.

Can I view token expiry or issued-at claims?

Yes. The decoded payload will show standard claims like exp, iat, and nbf where available.

Can I validate HS256 tokens if I only have the public key?

No - HS256 requires the secret key used to sign the token. For RSA algorithms (RS256), you need the public key to validate signatures.

Security & Identity Tools

JWT Decoder

Free JWT decoder and validator. Decode header, payload & signature, inspect claims, check exp/iat, and validate HS256 tokens securely in your browser. No data uploaded.

Paste JSON Web Token (JWT):

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyLCJleHAiOjE5MTYyMzkwMjJ9.4zC4m_GzV58pYhJ14K3mE6R8K_Q7n0h5M2wF4g5Z_vQ

Token Status: Active / Valid(9/21/2030, 4:37:02 PM)

Header (Algorithm & Type):

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

Payload (Claims & Data):

{
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022,
  "exp": 1916239022
}

Key Features & Capabilities

Decode JWT header & payload (Base64URL)

Pretty JSON formatting

HS256 signature validation

View exp, iat, nbf timestamps

Export payload to JSON

Copy decoded parts easily

Full client-side processing (secure)

History for recent tokens

How to Use JWT Decoder

Input Data

Enter or paste your text or data into the workspace input field.

Configure Options

Adjust settings, options, or flags according to your desired outcome.

Process & Preview

Review the instant live output and analysis computed in real time.

Copy or Export

Click Copy to clipboard or download the processed results.

Frequently Asked Questions

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JWT Decoder

Key Features & Capabilities

How to Use JWT Decoder

Input Data

Configure Options

Process & Preview

Copy or Export

Frequently Asked Questions

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