get-json

#!/usr/bin/env node

const argv = require('minimist')(process.argv.slice(2));
const fs = require("fs");

var get_sub_path = function(data, param_name) {
	var p = param_name.split(/[\.\/]/);
	var v = data;
	if (typeof v !== "object" || v === null) {
		return null;
	}
	while(p.length > 1) {
		var pk = p.shift();
		if (!v.hasOwnProperty(pk) ||
				typeof v[pk] !== "object" ||
				v[pk] === null ) {
			return null;
		}
		v = v[pk];
	}
	var pk = p.shift();
	if (!v.hasOwnProperty(pk)) {
		return null;
	}
	return v[pk];
};


const p = JSON.parse(fs.readFileSync(argv.file));

var value = get_sub_path(p, argv.key);
if (value !== null) console.log(value);