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

$ npm install jsoning-api

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

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.json file (you can provide an empty array)

[
  {
    "input": { "method": "GET", "path": "/status/401" }, 
    "output": { "status": 401, "response": {"error": "demo error"} },
    "stop" : true
  }
]

With this rule, calling the resource /status/401 will return a 401 error.

Start the REST API service

$ npm start

Get a REST API

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

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

• 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 are defined using JSON. With these JSON-based rules, you can set conditions based on the request (such as HTTP method, headers, and payload) and specify the response (including HTTP status code and payload). This allows you to tailor the API's behavior to meet specific testing and development needs.

Rules are applied before the API execution (which reads, writes, or deletes data).

If multiple rules match the request, only one is executed (the first one found).

The HTTP status and payload defined by the rules take precedence over those set by the API.

Here is an example of a rule:

  {
    "input": { "method": "GET", "path": "/status/401" }, 
    "output": { "status": 401, "response": {"error": "demo error"} },
    "stop" : true
  }

The stop attribute indicates whether to halt after applying the rule or to continue with the API execution.

The input object is used to represent the different criteria that can be tested in the request.

| Attribute | Description                                                 |
|-----------|-------------------------------------------------------------|
| headers   | The headers (Object: each header is an attribute)           |
| method    | The HTTP method ('GET', 'POST', 'PUT', 'PATCH', 'DELETE')   |
| path      | The pathname of the URL (e.g., /users/23).                  |
| payload   | The payload (object or string)                              |

The output object is used to update the response if the rule match.

| Attribute | Description                                 |
|-----------|---------------------------------------------|
| status    | Sets the HTTP status (e.g., 200, 404, etc.) |
| response  | Sets the response payload                   |
| headers   | Sets the headers                            |

Launch tests

$ npm test

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!

MIT License