What Is a JWT Token?
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A JSON Web Token (JWT) is a compact, URL-safe token used for authentication and information exchange. It contains three Base64URL-encoded parts separated by dots: Header (algorithm and token type), Payload (claims/data), and Signature (cryptographic verification). JWTs are widely used in OAuth 2.0, OpenID Connect, and REST API authentication.
Use the JWT Decoder above — enter your values and get instant results. This free online tool calculates how to decode jwt token without any download or signup required. Results update in real time as you type.
Use the JWT Decoder above — enter your values and get instant results. This free online tool calculates jwt decoder free online without any download or signup required. Results update in real time as you type.
This tool is 100% client-side — your JWT is decoded in your browser using JavaScript and is never sent to any server. However, as a general security best practice, avoid pasting production JWTs with sensitive user data into any online tool. For debugging production tokens, use your local development environment or a trusted internal tool.
JWT signature verification requires the secret key (for HS256) or public key (for RS256/ES256). This tool only decodes the readable Header and Payload — it cannot verify the signature without the key. A JWT could be modified and re-encoded — always verify the signature server-side before trusting any JWT claims.