Django Rest Framework ORJSON Renderer

drf_orjson_renderer2 is JSON renderer and parser for Django Rest Framework using the orjson library. Backed by Rust, orjson is safe, correct and fast. ⚡️

In addition, unlike some performance optimized DRF renderers, It also renders pretty printed JSON when requests are made via RestFramework's BrowsableAPI.

You get:

• The safety of Rust
• The speed of orjson when requests are made with Accept: appliation/json HTTP header or when requests are made with an unspecified Accept header.
• The convenience of formatted output when requested with Accept: text/html.
• The ability to pass your own default function definition.

Installation

pip install drf-orjson-renderer2

You can then set the ORJSONRenderer class as your default renderer in your settings.py

REST_FRAMEWORK = {
    "DEFAULT_RENDERER_CLASSES": (
        "drf_orjson_renderer2.renderers.ORJSONRenderer",
        "rest_framework.renderers.BrowsableAPIRenderer",
    ),
}

To modify how data is serialized, specify options in your settings.py

REST_FRAMEWORK = {
    "ORJSON_RENDERER_OPTIONS": (
        orjson.OPT_NON_STR_KEYS,
        orjson.OPT_SERIALIZE_DATACLASS,
        orjson.OPT_SERIALIZE_NUMPY,
    ),
}

Also you can set the ORJSONParser class as your default parser in your settings.py

REST_FRAMEWORK = {
    "DEFAULT_PARSER_CLASSES": (
        "drf_orjson_renderer2.parsers.ORJSONParser",
    ),
}

Passing Your Own default Function

By default, the ORJSONRenderer will pass a default function as a helper for serializing objects that orjson doesn't recognize. That should cover the most common cases found in a Django web application. If you find you have an object it doesn't recognize you can pass your own default function by overriding the get_renderer_context() method of your view:

from rest_framework.views import APIView
from rest_framework.response import Response


class MyView(APIView):
    def default(self, obj):
        if isinstance(obj, MyComplexData):
            return dict(obj)

    def get_renderer_context(self):
        renderer_context = super().get_renderer_context()
        renderer_context["default_function"] = self.default
        return renderer_context

    def get(self, request, *args, **kwargs):
        my_complex_data = MyComplexData()
        return Response(data=my_complex_data)

If you know your data is already in a format orjson natively recognizes you can get a small performance boost by passing None to the renderer_context:

def get_renderer_context(self):
    renderer_context = super().get_renderer_context()
    renderer_context["default_function"] = None
    return renderer_context

As of ORJSON version 3, 2-space indenting is supported in serialization. In order to take advantage of the RestFramework Browsable API, when the requested media type is not application/json, the ORJSON renderer will add orjson.OPT_INDENT_2 to the options mask to pretty print your output.

Benchmarks

See the orjson Benchmarks for more information