json-config-reader

json-config-reader

This module was made for iora, but can be used separately to read any JSON configurations.

json-config-reader reads configurations, parses them, and caches them in case they need to be referenced again.

Usage

The json-config-reader package consists of a simple API, containing two methods.

To use it, you simply use the require function after installing it via npm npm install json-config-reader.

var jc = require('json-config-reader');

.read

The .read method attempts to read a file, then attempts to parse it as JSON. If successful, it caches the data.

  var data = jc.read('some.json');
  // `data` is now a usable object.

The object is cached so the files doesn't have to be read over and over again...

// The first read fetches the contents from the file and parses it.
var data1 = jc.read('config.json');

// The second read refers to the `global.__jsonCache` object.
var data2 = jc.read('config.json');

.purge

The .purge method sets and entry in global.__jsonCache to undefined, so the .read function will re-read the JSON file.

// my.json = {'example': 'test'}

// Read the json file and store it.
var data1 = jc.read('my.json');

// Rewrite the JSON file to something different!
fs.writeFileSync(
  'my.json',
  JSON.stringfy({'foo': 'bar'})
);

// Try to read the new json file
var data2 = jc.read('my.json');
// But if refers to the cache!
// At this point, data1 and data2 are the same, since data2 is from the cache.

// Purge cache.
jc.purge('my.json');

// Read again!
var data3 = jc.read('my.json');

// The results would be:
// data1 = {'example': 'test'}
// data2 = {'example': 'test'}
// data3 = {'foo': 'bar'}

.__objectCache and global.__objectCache

Note: You shouldn't ever have to use these objects yourself. .read provides automated functionality to read from the cache object. These objects are where the cache is stored, you should access them with .read.

These objects hold the cache values, they both reference the same value in the memory, so if you change one, it'll change the other.

var test1 = jc.read('test.json');

// Remember, you shouldn't ever have to do this...
var test2 = global.__jsonCache['/absolute/path/to/test.json'];

// test1 and test2 are the same.