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What is the max size of JWT token?
As a JWT is included in a HTTP header, we’ve an upper limit (SO: Maximum on http header values) of 8K on the majority of current servers. As this includes all Request headers < 8kb, with 7kb giving a reasonable amount of room for other headers.
What is the size of a JWT token?
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).
How do I shorten a JWT token?
Now if you need a smaller token you can write your own impl for tokens….JWT has 3 parts,
- The header – which has info of which algos are used for signing and encoding.
- the body – which is a base64 encoding of data you want to send.
- The signature- which is HS256 hash(default) to ensure no tampering has been done.
How big is a session token 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).
Are there any downsides to using JWT for sessions?
There are quite a few downsides to using JWT as a session mechanism, several of them being serious security issues. JWT tokens are not exactly small. Especially when using stateless JWT tokens, where all the data is encoded directly into the token, you will quickly exceed the size limit of a cookie or URL.
What does the unique identifier on a JWT mean?
Indicates that the token is a JWT. A unique identifier used to protect against token replay attacks. Your resource can record this value to protect against replays. Specifies the thumbprint for the public key that’s used to sign this token. Emitted in both v1.0 and v2.0 access tokens.
Is there an upper limit for JWT headers?
As a JWT is included in a HTTP header, we’ve an upper limit (SO: Maximum on http header values) of 8K on the majority of current servers. As this includes all Request headers < 8kb, with 7kb giving a reasonable amount of room for other headers.