Luch NPM | npm.io

Light and flexible promise-based http client built on top of isomorphic-fetch with usefull extra functionality

luch

The luch is light and flexible modular http client built on top of isomorphic-fetch, which build on GitHub's WHATWG Fetch polyfill.

The luch could be used for both environments as for browser and for node.js, it provides possibility to make requests in easy laconic way with flexible configuration. Also luch uses isomorphic and standardized base under the hood because it built on top of isomorphic-fetch.

Warnings

According to origin isomorphic-fetch docs

You must bring your own ES6 Promise compatible polyfill, I suggest es6-promise.
For ease-of-maintenance and backward-compatibility reasons, this library will always be a polyfill. As a "safe" alternative, which does not modify the global, consider fetch-ponyfill.

Installation

NPM

npm install --save luch es6-promise

luch API

luch(url , options)

require('es6-promise').polyfill();
const {luch} = require('luch');
// or es6
import {luch} from 'luch';

const someHeaders = new Headers();

const someOptions = {
  method: 'GET',
  headers: someHeaders,
  mode: 'cors',
  cache: 'default',
};

luch('api.web.com', someOptions)
  .then(response => response.json())
  .then(data => succFn(data))
  .catch(err => errFn(err))

Request method aliases

For convenience aliases have been provided for all popular request methods.

luch.get(url , params, config)

luch.head(url , params, config)

luch.options(url , params, config)

luch.delete(url , params, config)

luch.post(url , data, config])

luch.put(url , data, config])

luch.patch(url , data, config])

NOTE

By default get head options delete methods stringify params to query-string and post put patch pack data argument to body as json.

luch.get('http://cool.api.com/resource', {limit: 5, offset: 0})
  .then(response => handleResponse(response))
  .catch(err => handleErr(err));

luch.post('http://cool.api.com/things', {name: 'luch', howCoolItIs: 'very cool'});


const optns = {
  headers: new Headers(),
  cache: 'default',
};

const vals = {
  name: 'dog',
  howCoolItIs: 'WUF WUF',
};

luch.put('http://cool.api.com/things', vals, optns);

luchFor

luchFor is method for defining customized luch-like clients with common configuration for multi requests.

luchFor(baseUrl , baseOptions)

// base.js
import {luchFor} from 'luch';

const localhostUrl = 'http://localhost:3000';

const localhostOptions = {
  headers: new Headers({
    "Content-Type": "application/json",
  }),
};

export const localhostLuch = luchFor(localhostUrl, localhostOptions);

// Voila! Now you can use it like original luch, but with predefined configuration

localhostLuch('/');
// => same as luch(`${localhostUrl}/`, localhostOptions);

const coolArticle = {
  title: 'LUCH FOR?? FOR WHAT??!!?',
  desc: 'WUF WUF',
};

localhostLuch.post('/articles', coolArticle);
// same as luch.post(`${localhostUrl}/articles`, coolArticle, localhostOptions);

Thats not all!

You can call addToBaseConfig method on luchFor objects, it especially usefull with modules using.

addToBaseConfig(path , options)

// users.js
import {localhostLuch} from './base';

const usersPath = '/users';

const usersConfig = {
  cache: 'default',
};

const usersLuch = localhostLuch.addToBaseConfig(usersPath, usersConfig);

usersLuch.post('/', {name: 'Dude'});

export const updateUser = (id, data) => userLuch.put(`/${id}`, data);

Note

You can pass options argument like in regular luch request, but it will be united with baseOptions by flat merging, so some baseOptions attributes values could be overriden by values from options.

You can read baseUrl and baseOptions values from luchFor object

console.log(localhostLuch.baseUrl, localhostLuch.baseOptions);

Utils

The luch lib provides some extra methods

getAbsoluteUrl(baseUrl)(path)

import {luch, getAbsoluteUrl} from 'luch';

const apiUrl = 'http://localhost:3000';
const withApiUrl = getAbsoluteUrl(apiUrl);


const user = {...};
luch.post(withApiUrl('/users'), user);
// => same as luch.post('http://localhost:3000/users', user)

luch.get(withApiUrl('/resource'));
// => same as luch.get('http://localhost:3000/resource')

luch.get(withApiUrl('/resource2'));
luch.get(withApiUrl('/resource3'));

// calling without path argument will return baseUrl
luch.get(withApiUrl());
// => luch.get('http://localhost:3000')

removeUndefinedAttrs(obj)

import {removeUndefinedAttrs} from 'luch';

const obj = {
  a: undefined,
  b: null,
  c: false,
  d: 0,
  e: '',
  f: 42,
};

removeUndefinedAttrs(obj);
/* => {
  b: null,
  c: false,
  d: 0,
  e: '',
  f: 42,
}; */

console.log(obj);
// => {a: undefined, b: null, ...}

appendToFormData(body , formData)

Append or transform object to FormData.

import {luch, appendToFormData} from 'luch';

const data = {/* WUF WUF */};

const options = {
  method: 'POST',
  body: appendToFormData(data),
};

luch('https://wuf.wuf', options);

getJson

Use it when you need call json method on response

import {luch, getJson} from 'luch';

// from
luch(someUrl)
  .then(response => response.json())
  .then(data => handleData(data);

// to
luch(someUrl).then(getJson).then(handleData);