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

Reader consists of a simple API.

Reader.read(file, [call])

With .read, you can read asynchronously or synchronously depending on if you provide a callback.

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

// Read synchronously
var data = jc.read("some.json");
console.log(data);

// Read asynchronously
jc.read("some.json", function(data){
  console.log("data");
});

Note that both refer to the same cache bank.

Reader.purgeCache([file])

.purgeCache sets cache values to undefined in the Reader.__cache bank. This is helpful if you update a JSON file mid-script and need to read it again to get the new value.

// Lets say some.json is { "test": 1 }

var data1 = jc.read("some.json");
fs.writeFileSync("some.json", JSON.stringify({"new": "values!"}));
var data2 = jc.read("some.json");

// data1 and data2 are the same.  The second `.read` fetched from the cache.

jc.purgeCache("some.json");
var data3 = jc.read("some.json");

// Now we have:
// data1 and data2 = { "test": 1 }
// data3 = { "new": "values!" }

global.__jsoncache

global.__jsoncache is used internally. It's an object that routes file paths to the parsed data (if successfully parsed).

var data1 = jc.read("/home/jamen/some.json");
var data2 = global.__jsoncache["/home/jamen/some.json"];

// Both data1 and data2 are the same.

Note! You should never have to refer to the global.__jsoncache object yourself. Reader.read implements cache lookups, and falls back by reading and parsing the file (then adding that data to the bank).