flask-restx
Fully featured framework for fast, easy and documented API development with Flask
Decision gist · record as of 2026-08-14
Yes. Flask-RESTX is a stable, actively maintained extension with low install friction, no known vulnerabilities, and permissive licensing. It's well-suited for developers building REST APIs on Flask who want automatic documentation and schema validation without the overhead of a full framework migration. The recent maintenance history and broad Python version support make it a reliable choice.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.9+; Flask 2.0+ (version 1.3.0+ supports Flask 3.0.0).
- Low install friction with a pure-wheel distribution.
- Actively maintained as of September 2025 with recent commits and community stewardship since early 2023.
License · maintenance · safety
BSD-3-Clause (permissive) — BSD-3-Clause is permissive; you can use this in commercial and proprietary projects with minimal restrictions beyond retaining the license notice.
last release 2025-09-23 (325 days) · last repo commit 2026-04-14 · 2,234 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 2,088,467 downloads/mo, #3,304 on PyPI
Alternatives
Verify before relying
pip install flask-restx
from flask import Flask
from flask_restx import Api, Resource
app = Flask(__name__)
api = Api(app)
ns = api.namespace('items')
@ns.route('/')
class ItemList(Resource):
def get(self):
return {'items': []}
if __name__ == '__main__':
app.run()- Whether the package's Swagger/OpenAPI generation covers all modern OpenAPI 3.x features or remains limited to earlier specs.
- Performance characteristics when documenting large APIs with hundreds of endpoints.
What it is and what it does
Flask-RESTX is a community-maintained extension for Flask that simplifies REST API development by providing a set of decorators and utilities to define endpoints, validate request/response schemas, and automatically generate Swagger documentation. It encourages best practices with minimal boilerplate—you define your API resources as classes, decorate them with namespace and HTTP method handlers, and Flask-RESTX handles routing, validation via jsonschema, and interactive API documentation.
The package depends on Flask, werkzeug, aniso8601 for date parsing, jsonschema for validation, and importlib-resources for resource loading. It's designed for developers already familiar with Flask who want to move faster when building documented APIs without switching to a heavier framework. The library is actively maintained, supports Python 3.9 through 3.12, and has been updated to work with modern Flask and Werkzeug versions.
Use it for
- Build a REST API with automatic Swagger/OpenAPI documentation without writing separate spec files.
- Define request/response schemas using Flask-RESTX field models and validate payloads automatically.
- Organize endpoints into logical namespaces and expose them through a single Api instance.
- Generate interactive API documentation that clients can use to explore and test endpoints.
- Migrate from Flask-RESTPlus to a maintained fork with ongoing community support and compatibility updates.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Flask-RESTX is a stable, actively maintained extension with low install friction, no known vulnerabilities, and permissive licensing. It's well-suited for developers building REST APIs on Flask who want automatic documentation and schema validation without the overhead of a full framework migration. The recent maintenance history and broad Python version support make it a reliable choice.
Install
flask-restx on PyPI
Before you install
Low install friction with a pure-wheel distribution. Actively maintained as of September 2025 with recent commits and community stewardship since early 2023.
Requires Python 3.9+; Flask 2.0+ (version 1.3.0+ supports Flask 3.0.0).
License in practice
BSD-3-Clause is permissive; you can use this in commercial and proprietary projects with minimal restrictions beyond retaining the license notice.
Quickstart
pip install flask-restx
from flask import Flask
from flask_restx import Api, Resource
app = Flask(__name__)
api = Api(app)
ns = api.namespace('items')
@ns.route('/')
class ItemList(Resource):
def get(self):
return {'items': []}
if __name__ == '__main__':
app.run()Verify before relying
- Whether the package's Swagger/OpenAPI generation covers all modern OpenAPI 3.x features or remains limited to earlier specs.
- Performance characteristics when documenting large APIs with hundreds of endpoints.
Package facts
| License | BSD-3-Clause permissive |
| Python support | Supports the current Python release >=3.9 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 6 packagesaniso8601jsonschemareferencingFlaskwerkzeugimportlib-resources |
| Maintenance | Actively maintained 325 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 2,088,467 / month, #3,304 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Development Status :: 5 - Production/StableEnvironment :: Web EnvironmentIntended Audience :: DevelopersLicense :: OSI Approved :: BSD LicenseOperating System :: OS IndependentProgramming Language :: PythonProgramming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.9Programming Language :: Python :: Implementation :: PyPyTopic :: Software Development :: Libraries :: Python ModulesTopic :: System :: Software Distribution |
Evidence: flask_restx-1.3.2-py2.py3-none-any.whl
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See also flask-restplus · flask-swagger-ui · flask-openapi3 · flask-openapi3-swagger · flask-swagger · Flask-RESTful · flask-apispec · flask-pydantic-spec · flasgger · quart-schema