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What should be stored in JWT payload?
Unserialized JWTs have two main JSON objects in them: the header and the payload . The header object contains information about the JWT itself: the type of token, the signature or encryption algorithm used, the key id, etc. The payload object contains all the relevant information carried by the token.
How much data can you store in JWT?
If we store the ID in a JWT (with basic header fields set, as well as a reasonably long secret), the size has now inflated to 304 bytes. For storing a simple user session, that is a ~51x size inflation on every single page request in exchange for cryptographic signing (as well as some header metadata).
What information should be stored in JWT?
1 Answer
- Registered claims like sub , iss , exp or nbf.
- Public claims with public names or names registered by IANA which contain values that should be unique like email , address or phone_number . See full list.
- Private claims to use in your own context and values can collision.
What is the best algorithm for JWT?
When signing is considered, currently the most recommended algorithm is ES256 (The Elliptic Curve Digital Signature Algorithm (ECDSA) using P-256 and SHA-256), although still the most popular one is RS256 (RSASSA-PKCS1-v1_5 using SHA-256).
Is it safe to store information in JWT payload?
Assuming you are using JWT correctly, it is safe to store information inside it. Since it is signed, an attacker can not fiddle with the content. Edit: While the signature makes sure that the payload is not fiddled with, it does not guarantee it is still up to date. See Andy N’s very good answer.
How are JWT tokens stored in JSON format?
The header and payload are stored in JSON format before signed. The final token is a concatenation of the base64 data of the above, delimited by a period. So, a JWT token would look like the following:
Is it OK to pass sensitive data in JWT?
Shortly: yes, it is OK to pass/receive sensitive data in JWT if you encrypt the data before placing into JWT’s payload and decrypt it after the JWT validation to use it.
What are the different types of JWT payloads?
There are two kinds of JWTs: JWS: Payload is in “plain text” and has a signature to confirm its contents JWE: The payload is completely encrypted. These have slightly different use-cases.