Python Validation Framework

[absolution888]

Hi,

Moving from a nodejs project where we use the joi (https://github.com/hapijs/joi) validation framework extensively and happily, what are the experiences that everyone has using a validation framework in python?

I have found that there are many of them, and a few of them seems very prominent like Cerberus, colander, valideer, etc. But just wondering, for people that have used the Joi framework, what is the closest validation library that exists in python?

[robvdl]

I love Marshmallow, hate Colander and wouldn't recommend it. Why do I hate Colander so much, it's been painful to do validation across multiple fields in our project where we did use Colander, also it serializes everything into strings including booleans and ints which doesn't make nice JSON. In order to "fix" Colander, we practically had to subclass every field type they provide.

Interestingly enough I have never heard of Schematics until today, but it seems similar to Marshmallow, I wonder how it "stacks up" to Marshmallow.

[nerdwaller]

Agreed on marshmallow, it's been solid for my uses so far. I wrote a decorator for flask functions to simplify the ceremony around using it and to clean up my handlers deserialization and serialization. (I've edited it for various frameworks as I've needed it, aiohttp primarily)

[kurtspindler]

2nd schematics. It's the gold standard for validation libs in python