Headers Factory

Opinionated headers factory for easy use with fetch and other AJAX things too I guess.

99% of the time I'm hitting a JSON API in CORS mode, getting or posting some data, and maybe sending up a JWT token.

So I've designed this module to make that use case super easy.

Install

# with npm 
npm install --save headersfactory
 
# with yarn 
yarn add headersfactory

Use

headersFactory(jwtToken)(method, data)

// with es6
import headersFactory from 'headersfactory';
 
// with CommonJS
const headersFactory = require('headersfactory');
 
// Example get with no JWT token
const githubUrl = 'https://api.github.com/users/tylerbuchea/repos?sort=updated';
const githubHeaders = headersFactory()('get');
 
fetch(url, githubHeaders)
    .then(response => response.json())
    .then(console.log)
    .then(console.error);
 
// Example post and get with JWT token
const madeupUrl = 'https://api.example.com/users';
const jwtToken = 'IMAJWTTOKEN'; // no need add "Bearer " it is added automatically
 
// No we can use headers() to generate new headers with the JWT token automatically connected
const headers = headersFactory(jwtToken);
 
const headersPost = headers('post', { age: 27 }); // JSON is automatically strinigified and attached to the body of the request
fetch(madeupUrl, headersPost)
    .then(response => response.json())
    .then(console.log)
    .then(console.error);
 
// We can use headers() again and the JWT is still automatically attached even though we're performing a different call
const headersGet = headers('get');
fetch(madeupUrl, headersGet)
    .then(response => response.json())
    .then(console.log)
    .then(console.error);
 
 

The actual code

This whole module is super tiny feel free to just copy paste it into your own file locally and modify as opposed to npm install-ing it.

'use strict';
 
function headersFactory(jwtToken) {
  return function headers(method, data, headers) {
    var header = {
      mode: 'cors',
      method: method,
      headers: {
        Accept: 'application/json',
        'Content-Type': 'application/json',
      },
    };
    if (jwtToken) header.headers.Authorization = 'Bearer ' + jwtToken;
    if (data) header.body = JSON.stringify(data);
    return header;
  };
}
 
module.exports = headersFactory;