MockAPY

MockAPY is a versatile tool that allows you to mock REST APIs using Python code execution. It allows to easily simulate and test API behaviors, providing a dynamic environment to craft custom responses and logic.

Inspired by Mockae (Mock REST APIs using Lua code execution).

Install

$ npm install mockapy

# Or clone the repository
$ git clone https://github.com/cyrilbois/mockapy.git
$ cd mockapy
$ npm install

You can also generate a mock API online at pythonium.net to test this fake API, though without custom rules.

Configuration

Create a db.json file

{
  {
    "products": [
      {
        "id": 1, "name": "T-shirt", "price": 19.99
      },
      {
        "id": 2, "name": "Jeans", "price": 49.99
      }
    ],
    "users": [
      {
        "id": 1, "username": "johndoe", "email": "[email protected]"
      },
      {
        "id": 2, "username": "janedoe", "email": "[email protected]"
      }
    ]
}
}

In this example, you have created 2 resources: "products" and "users" (2 objects for each resource).

Create a rules.py file

import request
import response
import json

def handle_request():
    if request.method() == "POST" && request.pathname() == "/users":
        response.status(400)
        response.send(json.dumps({
            "error": "Bad Request",
            "message": "Missing required field: email"
        }))
        response.exit()

With these rules, when calling the creation of a "users" a 400 error is returned.

Usage

Start the REST API service

$ npx mockapy

# Or if you have cloned the repository
$ npm start

Get a REST API

$ curl http://localhost:3000/products/1
{
    "id": 1,
    "name": "T-shirt",
    "price": 19.99
}

Routes

The REST API handles different HTTP methods for creating, retrieving, updating, and deleting resources

GET     /products     Returns all products
GET     /products/2   Returns the product with ID 2
POST    /products     Create a new product
GET     /products/2   Returns the product with ID 2
PUT     /products/2   Update the product with ID 2
PATCH   /products/2   Update partially the product with ID 2
DELETE  /products/2   Delete the product with ID 2

Pagination

• page
• limit

GET     /products?limit=5         Returns the first 5 products (Page defaults to 1)
GET     /products?page=2          Returns 10 products from the second page (default limit is 10)
GET     /products?page=2&limit=5  Returns 5 products from the second page (Page starts at 1)

Custom rules

Custom rules are Python code that allow you to modify the behavior of the fake REST API. With custom rules, you can set conditions based on the request (such as HTTP method, headers, and payload) and define the response (including HTTP status code and payload). This enables you to tailor the API's behavior to suit specific testing and development scenarios.

Your Python script must define a function handle_request that contains the rules.

Python code is executed via Pyodide in a Node.js environment. Pyodide is a Python distribution for the browser and Node.js based on WebAssembly.

The Request and Response objects are provided to define the rules.

Request

The Request object is used to represent the request data.

| Method                  | Description                                                                        |
|-------------------------|------------------------------------------------------------------------------------|
| request.header(name)    | Returns the header `name`                                                          |
| request.method()        | Returns the HTTP method ('GET', 'POST', 'PUT', 'PATCH', 'DELETE')                  |
| request.url()           | Returns the pathname of the URL (e.g., /users/23).                                 |
| request.id()            | Returns the resource ID                                                            |
| request.resource()      | Returns the resource                                                               |
| request.payload(name)   | Returns the attribute of the payload object with the name specified in `name`      |

Response

The Response object is used to update the response, including the HTTP status, headers, and payload.

| Method                     | Description                                                                                     |
|----------------------------|-------------------------------------------------------------------------------------------------|
| response.status(status)    | Sets the HTTP status (e.g., 200, 404, etc.)                                                     |
| response.send(payload)     | Sets the response payload                                                                       |
| response.header(name, value) | Sets the header name to value                                                                  |
| response.exit()            | Stops the standard execution of the API (No action or resource loading will be performed)       |

Contributing

Contributions are welcome! If you have ideas, improvements, or bug fixes, feel free to submit a pull request. Please ensure your changes keep things simple and easy to maintain. Thank you for helping make this project better!

Tests

Launch tests

$ npm test

License

MIT License