Fast JSON Schema for Python

en in code • 2 min read

JSON is used in many places. It’s easy to learn, read, and use. JSON is also compact and won the battle with an XML to be a generic format to exchange data. But JSON has its problems as well. The biggest issue, I would say, is the same as the most prominent feature—it’s very free.

We have to be able to validate data, and for the JSON, there is JSON schema. “A vocabulary that allows you to annotate and validate JSON documents.”

Many languages implemented that in many libraries. Unfortunately, when you need to process a lot of data, but not A LOT to switch to a compiled language, it can be very slow.

For example, in Python, there are three main libraries. The most popular jsonschema is slow, the second most popular json-spec is even more time-consuming and the last validictory is fast, but does not follow the standards.

So I created a library that is still in pure Python, but very fast. It works by producing a straightforward and stupid Python code. Not complicated objects or other constructs.

The result?

  • jsonschema takes 5 seconds
  • json-spec takes 7 seconds
  • validitory takes 380 miliseconds (but with bugs)
  • and mine fastjsonschema takes only 250 miliseconds

fastjsonschema has been here since 2016, but it supported only the most essential features of JSON schema. Now, there is second version supporting all JSON features (including draft 06 and 07) and is still incredibly fast. :-)

I’m giving big thanks to all contributors who helped to implement missing features and find the bugs.


1 response

Awesome work. Thanks!

You may also like

en Makefile with Python, November 6, 2017
en Deployment of Python Apps, August 15, 2018
cs Jasně, umím Git…, August 6, 2014
cs Checklist na zabezpečení webových aplikací, March 1, 2016
cs Pokročilé regulární výrazy, August 17, 2014

More posts from category code.
Do not miss next posts thanks to Atom/RSS feed.

Recent posts

cs Sousedi mají rádi ementál, May 4, 2021 in family
en Amazing Game Last of Us, April 27, 2021 in reviews
cs Síla myšlenky, April 19, 2021 in family
en Why Do We Exercise?, April 13, 2021 in humanity
cs Dva roky…, April 6, 2021 in family