Fast JSON Schema validation for Python implemented in Rust

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  • License: MIT License (MIT)
  • Author: Dmitry Dygalo
  • Maintainer: Dmitry Dygalo
  • Tags jsonschema, validation, rust
  • Requires: Python >=3.6
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Project description

Build Version Python versions License

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

or:

import jsonschema_rs

validator = jsonschema_rs.JSONSchema({"minimum": 42})
validator.validate(41)  # raises ValidationError

NOTE. This library is in early development.

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 or jsonschema on PyPy.

Schemas:

  • kubernetes-openapi is an Open API schema for Kubernetes which is ~3.15 MB JSON file.

  • small is taken from fastjsonschema benchmarks.

Compiled validators (when the input schema is compiled once and reused later). jsonschema-rs comes in two variants in the table below:

  • validate. This method raises ValidationError on errors or returns None on their absence.

  • `is_valid. A faster method that returns a boolean result whether the instance is valid.

Ratios are given against the validate variant.

library

false

{"minimum": 10}

small

kubernetes-openapi

jsonschema-rs[validate]

200.51 ns

203.30 ns

1.09 us

14.97 ms

jsonschema-rs[is_valid]

186.00 ns (x0.92)

186.79 ns (x0.91)

884.40 ns (x0.81)

13.94 ms (x0.93)

fastjsonschema[CPython]

58.57 ns (x0.29)

109.10 ns (x0.53)

4.21 us (x3.86)

91.79 ms (x6.13)

fastjsonschema[PyPy]

1.32 ns (x0.006)

33.39 ns (x0.16)

1.17 us (x1.07)

44.27 ms (x2.95)

jsonschema[CPython]

226.48 ns (x1.12)

1.88 us (x9.24)

58.14 us (x53.33)

1.07 s (x71.47)

jsonschema[PyPy]

41.18 ns (x0.20)

224.94 ns (x1.10)

25.97 us (x23.82)

663.30 ms (x44.30)

The bigger the input is the bigger is performance win. You can take a look at benchmarks in benches/bench.py.

Package versions:

  • jsonschema-rs - latest version from the repository

  • jsonschema - 3.2.0

  • fastjsonschema - 2.14.5

Measured with stable Rust 1.49, CPython 3.9.1 / PyPy3 7.3.3 on i8700K (12 cores), 32GB RAM, Arch Linux.

Python support

jsonschema-rs supports CPython 3.6, 3.7, 3.8 and 3.9.

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.

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  • License: MIT License (MIT)
  • Author: Dmitry Dygalo
  • Maintainer: Dmitry Dygalo
  • Tags jsonschema, validation, rust
  • Requires: Python >=3.6
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