Wrapi NPM | npm.io

wrapi

Wrap Restful API endpoints as callable functions.

Create a Rest API SDK under 3 minutes.

With wrapi you make calls to HTTP based APIs just like ordinary JavaScript functions.

Installation

$ npm install wrapi --save

$ yarn add wrapi

Easy Start

Create a JSON file listing all API endpoints you want to work with.
Wrap endpoints with wrapi.
Call individual endpoints as functions.

See Sample Code

JSON File

Declare each endpoint in a json file as per the following specifications.

"function_name": {
	"method": "HTTP_METHOD",					// 'GET', 'POST', 'PUT', 'PATCH' or 'DELETE'
	"path": "relative/path/to/:api/endpoint"	// Use `express` style path params
}

E.g. a small set of github.com API:

{
	"repo": {
		"method" : "GET",
		"path" : "repos/:owner/:repo"
	},

	"contributors": {
		"method" : "GET",
		"path" : "repos/:owner/:repo/contributors"
	},

	"languages": {
		"method" : "GET",
		"path" : "repos/:owner/:repo/languages"
	},

	"tags": {
		"method" : "GET",
		"path" : "repos/:owner/:repo/tags"
	},

	"branches": {
		"method" : "GET",
		"path" : "repos/:owner/:repo/branches"
	}
}

Wrap endpoints

Create a API client object from wrapi. Provide the base url for the API and the JSON object. wrapi will create a client object with all the necessary functions.

const endpoints = require('./github.api.json');
const wrapi = require('wrapi');

const client = new wrapi('https://api.github.com/',	// base url for the API
  endpoints 										// your json object
);

// client object contains functions to call the API

Register

client.register('zen',
  {
    method : 'GET',
    path: 'zen'
  }
);

Make the call

Call API function with arguments and a callback.

// This will make GET request to 'https://api.github.com/repos/nodejs/node/contributors'
client.contributors('nodejs', 'node', function(err, contributors) {
  if (!err) {
  	console.log(contributors);
  }
});

client.zen(function(err, response) {
  if (!err) {
    console.log('Chris says "' + response + '"');
  }
});

API

wrapi is an open ended framework. It is not restricted any specific or a set of APIs.

All APIs providing HTTP interface to access the endpoints can be wrapped by wrapi, so that you can quickly build your client application.

Endpoint Definition

Note: method & path/url are required.

method - Any one of the HTTP methods (default: "GET")
path - route path to API Endpoint. Supports express style path params
query - an object consists of name-value pairs. This is optional. This is useful where resources are identified via query string parameters
options - options to override or to add specific to the API endpoint. E.g. {encoding:null} returns the response data as Buffer
url - fully qualified uri string to override. This is useful in cases where an API call connects to a different endpoint

Client object

The wrapi object conveniently provides the client interface to the API. Create the object by calling new wrapi().

The constructor takes the following arguments:

baseURL - The base url for the API. E.g. https://api.github.com/
endpoints - The JSON object listing the API endpoints. Provide {} - empty object or a partial list and then register (additional) endpoints later
options - Optional parameter. wrapi uses request module to connect to API server. The options parameter is the same options parameter used in request

Custom options

catchHTTP4xx5xx - Set this option to true to treat HTTP status 4xx & 5xx as errors. Default value is false. If set, the err argument in your callback function will contain the response body for 4xx & 5xx errors.

Register function

Add endpoints to client object.

register(functionName, endpointDefinition)

functionName - Alias for the endpoint, also the name of the function to call.
endpointDefinition - JSON object defining the endpoint.

Function calls

Call API endpoints via the function in the client object. Arguments to the function depend on the API declaration in the JSON.

Provide the arguments in the following order:

named params in the url path of the endpoint. eg. client.contributors('nodejs', 'node', // nodejs & node are path params
query string as an object with name-value pairs. eg. client.repositories({since:364} // ?since=364
body - JSON content for POST or PUT methods. Skip this argument if not required for the call.

To POST multipart/form-data, set this argument as {"formData" : multipartContent }

callback(err, data) - a callback function for the results to be returned. The callback is called when the response is fetched or if there is an error. This callback function gets the results of the response.
To pipe the results, pass a writable stream as the callback. Listen to error events on outputstream to catch streaming errors. See example.