Python Falcon - API Testing

Last Updated : 23 Jul, 2025

Python Falcon is a lightweight and fast web framework designed for building RESTful APIs. When it comes to API testing, Falcon provides a straightforward and efficient way to interact with your API endpoints. In this article, we'll explore three simple examples using Python Falcon: a basic API endpoint, form submission, and file upload with display.

Python Falcon - API Testing

Below, are the examples of Python Falcon - API Testing Tools.

Example 1: Basic API Endpoint

In this example, we've created a resource class HelloWorldResource with an on_get method, which is called when a GET request is made to the /hello endpoint. The response contains a JSON object with a greeting message.

Python3

import falcon

class HelloWorldResource:
    def on_get(self, req, resp):
        resp.status = falcon.HTTP_200
        resp.media = {'message': 'Hello, Falcon!'}

# Create a Falcon application
app = falcon.App()

# Add a route for the HelloWorldResource
app.add_route('/hello', HelloWorldResource())

if __name__ == '__main__':
    from wsgiref import simple_server

    # Run the Falcon app
    host = 'localhost'
    port = 8000
    httpd = simple_server.make_server(host, port, app)
    print(f'Starting Falcon app on http://{host}:{port}')
    httpd.serve_forever()

Output :

first-q

Example 2: Message Passing

In this example, we've created a resource class FormSubmitResource with an on_post method, which is triggered when a POST request is made to the /submit endpoint. The submitted form data is accessed using req.media, and a personalized response is sent back.

Python3

import falcon

class FormSubmitResource:
    def on_post(self, req, resp):
        data = req.media
        name = data.get('name', 'Guest')
        resp.status = falcon.HTTP_200
        resp.media = {'message': f'Hello, {name}! Form submitted successfully.'}

# Create a Falcon application
app = falcon.App()

# Add a route for the FormSubmitResource
app.add_route('/submit', FormSubmitResource())

if __name__ == '__main__':
    from wsgiref import simple_server

    # Run the Falcon app
    host = 'localhost'
    port = 8000
    httpd = simple_server.make_server(host, port, app)
    print(f'Starting Falcon app on http://{host}:{port}')
    httpd.serve_forever()

Output :

second-q

Example 4: Query Parameters Handling

In this example, we've created a resource class QueryParamsResource with an on_get method. The method retrieves query parameters using Falcon's req.get_param and req.get_param_as_int methods. It then processes the parameters and generates a response JSON object.

Python3

import falcon

class QueryParamsResource:
    def on_get(self, req, resp):
        # Retrieve query parameters
        name = req.get_param('name', default=None)
        age = req.get_param_as_int('age', default=None)

        # Process parameters and generate response
        response = {'message': 'Query parameters received successfully'}

        if name:
            response['name'] = name

        if age is not None:
            response['age'] = age

        resp.status = falcon.HTTP_200
        resp.media = response

app.add_route('/query', QueryParamsResource())

Output :

third-q

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Python Falcon - API Testing