jsonschema-rs 0.3.0

Fast JSON Schema validation for Python implemented in Rust

Fast JSON Schema validation for Python implemented in Rust.

Supported drafts:

• Draft 7

• Draft 6

• Draft 4

There are some notable restrictions at the moment:

• The underlying crate doesn’t support arbitrary precision integers yet, which may lead to SystemError when such value is used;

• multipleOf keyword validation may produce false-negative results on some input. See #84 for more details

Installation

To install jsonschema-rs via pip run the following command:

pip install jsonschema-rs

Usage

To check if the input document is valid:

import jsonschema_rs

validator = jsonschema_rs.JSONSchema({"minimum": 42})
validator.is_valid(45)  # True

NOTE. This library is in early development and not yet provide a way to show validation errors (even though it is implemented in the underlying Rust crate).

Performance

According to our benchmarks, jsonschema-rs is usually faster than existing alternatives in real-life scenarios.

However, for single-keyword or boolean schemas it might be slower than fastjsonschema.

Compiled validators (when the input schema is compiled once and reused later)

library	false	{"minimum": 10}	small	big
jsonschema-rs	273.01 ns	263.29 ns	904.38 ns	4.96 ms
fastjsonschema	49.77 ns (x0.18)	130.21 ns (x0.49)	5.7 us (x6.31)	575.66 ms (x115.84)
jsonschema	278.27 ns (x1.01)	2.41 us (x9.15)	75.27 us (x83.23)	1.83 s (x368.47)

Validators are not compiled (jsonschema) or compiled on every validation:

library	false	{"minimum": 10}	small	big
jsonschema-rs	349.74 ns	465.67 ns	6.97 us	5.15 ms
fastjsonschema	62.46 us (x178.59)	112.64 us (x241.9)	1.33 ms (x191.67)	574.5 ms (x111.55)
jsonschema	64.57 us (x184.64)	74.2 us (x159.34)	951.38 us (x136.37)	1.85 s (x360.38)

The bigger the input is the bigger is performance win.

In the examples below, big and small schemas refer to more realistic schemas and input instances. You can take a look at benchmarks in benches/bench.py. Ratios are given against jsonschema-rs.

Python support

jsonschema-rs supports Python 3.5, 3.6, 3.7 and 3.8.

License

The code in this project is licensed under MIT license. By contributing to jsonschema-rs, you agree that your contributions will be licensed under its MIT license.