When working with JWT (JSON Web Token), it is common to use the “Bearer” authentication scheme, where the token is prefixed with the word “Bearer” followed by a space.
However, if you encounter an error mentioning that the JWT token does not begin with the “Bearer” string, it means that the token you are using does not follow this convention. The authentication server or backend expects the token format to include the “Bearer” prefix for proper identification and handling.
Here’s an example to illustrate the correct format of a JWT token with the “Bearer” string:
Authorization: Bearer eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
In this example, the token is passed in the “Authorization” header with the value “Bearer” followed by a space and the actual token. The token itself is a JSON Web Signature (JWS) in the format of header.payload.signature, separated by dots.
It is crucial to follow this format to ensure proper authentication and authorization when using JWT tokens in your applications. If the received token does not begin with the “Bearer” string, you might need to check the token generation or retrieval process to ensure it is correctly implemented.