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117. What is JWT(JSON Web Token)?

JWT is a compact and self-contained method for securely transmitting information between parties as a JSON object. The information contained within the JWT is digitally signed and therefore can be trusted by parties. JWT consists of three parts: header, payload, and a signature. The header typically consists of the type of token and the used cryptographic algorithms. The payload contains the claims or a piece of information such as user ID, expiration time or user roles. Finally, the signature is used to verify that the message has not been tampered with and ensures that the information is authentic. JWTs are widely used in web applications as a means of authenticating users and exchanging information securely between parties.