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https://github.com/danielstjules/swaddle

Automagically create API clients/wrappers in JavaScript
https://github.com/danielstjules/swaddle

api client proxy wrapper

Last synced: 2 months ago
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Automagically create API clients/wrappers in JavaScript

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README 

        


  swaddle

  


  


  





Automagically create API clients/wrappers in JavaScript. This is a great

alternative for when client libraries don't already exist, and they can't be

easily generated from a swagger API. How does it work? ES6 proxies!



``` javascript

let repos = await github.users('octocat').repos.get()

// GET https://api.github.com/users/octocat/repos

```



[![Build Status](https://travis-ci.org/danielstjules/swaddle.svg?branch=master)](https://travis-ci.org/danielstjules/swaddle)



* [Overview](#overview)

* [Installation](#installation)

* [Options](#options)

  * [aliases](#aliases)

  * [fn](#fn)

  * [returnBody](#returnbody)

  * [sendAsBody](#sendasbody)

  * [json](#json)

  * [camelCase](#camelcase)

  * [extension](#extension)

  * [whitelist](#whitelist)

* [Compatibility](#compatibility)



## Overview



The library wraps an API, returning an object that builds the target URL with

each property and invocation. It performs the request when an HTTP method is

invoked. Properties reserved for HTTP methods include: get, post, put, patch,

delete, head, and options.



The library also comes with some sane defaults for JSON APIs. Two options are

set to true by default: json and returnBody. JSON response bodies are parsed,

and the response body itself is returned instead of the response object.

In the example below, we also make use of the camelCase option, which creates

a camelCase client for a snake_case JSON API.



``` javascript

let swaddle = require('swaddle')

let github = swaddle('https://api.github.com', {camelCase: true})



// GET https://api.github.com/users/octocat

let user = await github.users.get('octocat')

user.publicRepos // instead of user.public_repos



// Without async/await

github.users.get('octocat').then((user) => {

  // ...

})



// GET https://api.github.com/users/octocat/repos

let repos = await github.users('octocat').get()



// GET https://api.github.com/repos/octocat/Spoon-Knife/stargazers

let stargazers = await github.repos('octocat', 'Spoon-Knife').stargazers.get()



// GET https://api.github.com/search/repositories?q=tetris

let results = await github.search.repositories.get('?q=tetris')



// Identical operations, both perform

// GET https://api.example.com/users/octocat

await github.users('octocat').get()

await github.users().get('octocat')

```



The library is compatible with a range of HTTP request clients,

including:

[`got`](https://github.com/sindresorhus/got),

[`request`](https://github.com/request/request),

[`request-promise`](https://github.com/request-promise),

[`whatwg-fetch`](https://github.com/github/fetch), and

[`node-fetch`](https://github.com/bitinn/node-fetch).



None are installed as a dependency, giving you the freedom to pick your

favorite. Unless provided, it will default to trying to require `got`,

`request-promise`, `request`, or the browser's `fetch`, in that order.



``` javascript

let swaddle = require('swaddle')

let request = require('request')

let github = swaddle('https://api.github.com', {

  fn: request // Use `request` to perform requests

})



github.users('octocat').repos.get((err, repos) => {

  // GET https://api.github.com/users/octocat/repos

  // request uses callbacks instead of promises

})

```



## Installation



``` bash

npm install --save swaddle

npm install got # optional

```



## Options



Options are passed to the underlying request library in two ways. The first,

is during initialization:



``` javascript

let client = swaddle('https://api.example.com', {

  headers: {

    Authorization: 'Basic ' + Buffer.from('User:Pass').toString('base64')

  }

})

```



Any options set during initialization will be stored and inherited by all

requests to that API, unless otherwise overwritten. That is, in the following

request, both basic auth and the custom header would be set:



``` javascript

client.search.get('?q=foo', {

  headers: {'x-custom-header': 'value'}

}).then((res) => {

  // ...

})

```



All options are passed through to the underlying request function,

except for those reserved by swaddle.



### aliases



Creates aliases for the supplied HTTP methods. Default: none



``` javascript

let swaddle = require('swaddle')

let client = swaddle('https://api.example.com', {

  aliases: {create: 'post', destroy: 'delete'}

})



client.threads.create({body: {subject: 'hi'}}).then((res) => {

  // POST https://api.example.com/threads

  // body: '{"subject": "hi"}'

})

```



### fn



The request function to use. Unless provided, it will default to requiring

`got`, `request-promise`, `request`, or the browser's `fetch`, in that order.



``` javascript

let swaddle = require('swaddle')

let request = require('request-promise')

let client = swaddle('https://api.example.com', {

  fn: request

})

```



### returnBody



Returns the response body instead of response object. Default: true



``` javascript

let swaddle = require('swaddle')



let client = swaddle('https://api.example.com')

client.users.get().then((res) => {

  // Don't need to access res.body

})



client = swaddle('https://api.example.com', {returnBody: false})

client.users.get().then((err) => {

  // Need to access res.body

})

```



### sendAsBody



Any literal or object passed to post, put, or patch, is set as the request body.

Thus no additional headers or options can be set at the time of the request.

Combined with aliases, it can prevent an otherwise leaky HTTP abstraction.

Default: false



``` javascript

let swaddle = require('swaddle')

let client = swaddle('https://api.example.com', {

  aliases: {create: 'post'},

  sendAsBody: true

})



// Don't need to write:

// client.messages.post({body: 'foo'})



client.messages.create('foo').then((res) => {

  // POST https://api.example.com/messages

  // body: "foo"

})

```



### json



Parses the JSON response. This is built into some libraries, but not all

(e.g. fetch). Default: true



``` javascript

let swaddle = require('swaddle')



let client = swaddle('https://api.example.com')

client.users.get().then((res) => {

  // res.body has been parsed

})



client = swaddle('https://api.example.com', {json: false})

client.users.get().then((res) => {

  // res.body is a string response

})

```



### camelCase



Creates a camelCase client for a snake_case JSON API. Only available when both

returnBody and json are set to true. Camel case properties are appended as

snake case to the resulting url. Arguments passed during function invocation

are unaffected. Any objects request or response body are recursively formatted.

Default: false



``` javascript

let client = swaddle('https://api.example.com')



client.jobStatuses.get((err, res) => {

  // GET http://api/job_statuses

})



client.fooBar('bazQux').get().then((res) => {

  // GET http://api/foo_bar/bazQux

})



client.users(1).get().then((res) => {

  // If the original response body was '{"is_admin": false}', then res is

  // {isAdmin: false}

})



client.users.post({

  body: {isAdmin: false, name: 'Foo Bar'}

}).then((res) => {

  // POST http://api/users

  // body: '{"is_admin": false, "name": "Foo Bar"}'

})

```



### extension



Allows you to specify an extension to be appended to any requests,

required by some APIs. Default: empty



``` javascript

let swaddle = require('swaddle')

let client = swaddle('https://api.example.com', {

  extension: 'json'

})



client.users(1).get().then((res) => {

  // https://api.example.com/users/1.json

})



client.search.get('?q=foo').then((res) => {

  // https://api.example.com/search.json?q=foo

})

```



### whitelist



Whitelists properties that can be accessed. Required when polyfilling Proxy

support for older browsers. Note that the exception is thrown during the

property access, and not during request execution. Accepts arrays of strings

for top level resources, or objects with nested objects and arrays for listing

sub-resources. Default: empty



``` javascript

// Single top level resource, /user

var client = swaddle('https://api.example.com', {

  whitelist: ['users']

});



client.users().get().then((res) => {

  // success

});



client.search

// Error: search not listed in swaddle's whitelist



// Can provide a combination of objects & arrays for sub-resources

// Example supports: /users, /tickets, /tickets/replies, /tickets/related

client = swaddle(BASE_URL, {

  whitelist: {

    users: [],

    tickets: ['replies', 'related'],

  }

})



client.tickets(1).replies.get().then((replies) => {

  // success

})

```



## Compatibility



The module has been tested and is compatible with the following module

versions:



| package                                               | version  |

| ----------------------------------------------------- | --------:|

[`got`](https://github.com/sindresorhus/got)            | ^7       |

[`request`](https://github.com/request/request)         | ^2.81.0  |

[`request-promise`](https://github.com/request-promise) | ^4.2.0   |

[`whatwg-fetch`](https://github.com/github/fetch)       | ^2.03    |

[`node-fetch`](https://github.com/bitinn/node-fetch)    | ^1.6.3   |



The library makes use of Proxies, which means it works with Node 6.4+,

Chrome 49+, FF 18+, Opera 36+, Safari 10+, and Edge. For older versions of Node

and browsers such as IE9+ and Safari 6+, two things are required:

* Installing a polyfill like

  [`proxy-polyfill`](https://github.com/GoogleChrome/proxy-polyfill)

* Enumerating available properties via `whitelist`



This is because polyfills require that properties you want to proxy be known at

creation time. In a browser with fetch, an example would then be:



``` javascript

var github = swaddle('https://api.github.com', {

  whitelist: {users: ['repos']}

});



// Default to using fetch in the browser

github.users('octocat').repos.get().then((repos) => {

  // repos

});



github.search

// Error: search not listed in swaddle's whitelist

```



For browsers, it's assumed that you're using browserify, webpack, or similar,

to load the module with your build.