Extra properties maxBytes

[islombektoshev]

Context:
In most validation libraries, maxLength on a string counts Unicode code points, not bytes. However, in the database, storage limits are defined in terms of byte length (e.g., VARCHAR(255) refers to bytes, not characters). This mismatch can lead to runtime errors if multi-byte characters are used.

Question:
Is there a way to enforce string length validation based on byte size rather than code points? Specifically, I want to define a custom maxBytes constraint similar to maxLength, but I'm not sure how to implement or integrate that. Any suggestions?

[santhosh-tekuri]

you have to create custom vocabulary for this. I have implemented it. you can see it:

https://github.com/santhosh-tekuri/jsonschema/blob/boon/example_vocab_bytecount_test.go

with the above vocabulary you have two new keywords: maxBytes, minBytes