![]() ![]() Our online JWT decoder lets you examine the contents of any JWT by pasting it into the Token form field. If they match, it indicates that the JWT has not been tampered with and that the data it contains can be trusted. By re-computing the signature using the same algorithm, the recipient can compare it with the received signature. The recipient of the token uses the corresponding secret key or public key associated with the algorithm to validate the signature. This signature is appended to the JWT, creating a tamper-proof token.ĭuring the decoding process, the algorithm specified in the JWT’s header is used to verify the signature. The algorithm takes the header and payload of the token, combines them, and applies a secret key or private key to generate a unique signature. Common algorithms used for signature generation include HMAC (Hash-based Message Authentication Code) and RSA (Rivest-Shamir-Adleman). When encoding a JWT, the algorithm is selected and specified in the header of the token. JWTs utilize cryptographic algorithms to create and verify the signature, which is a critical component of the token. In the encoding and decoding process of a JWT, the algorithm plays a crucial role in ensuring the integrity and authenticity of the token. Every signed JWT lets you verify the integrity of the JWT without contacting the signer. These are all Base64 URL encoded so the resulting string is safe to put in HTTP headers, cookies and elsewhere. ![]()
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