The error message “JWT Strings must contain exactly 2 period characters. Found: 0” indicates that the provided JSON Web Token (JWT) does not follow the correct format.
A JWT consists of three parts separated by period characters. The format is as follows: header.payload.signature.
Here is a breakdown of each part:
- Header: The header contains information about the type of token and the hashing algorithm used for the signature. It is base64 encoded.
- Payload: The payload contains the claims or statements about the subject. It is also base64 encoded.
- Signature: The signature is used to verify the integrity of the token. It is generated by signing the header and payload with a secret key or private key using the specified algorithm.
When encountering the error “JWT Strings must contain exactly 2 period characters. Found: 0,” it means that the provided string does not contain any period characters. This could happen if there is an issue with generating or parsing the token.
Here is an example of a valid JWT:
eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c
In this example, we have three parts separated by two period characters. Each part is base64 encoded, but after decoding, you can see the actual content.
It’s important to ensure that the JWT you are working with follows the correct format. If you encounter the mentioned error, you may need to review your token generation or parsing logic to fix the issue.