jsonfork

jsonfork

JSON folk-transforming tool

Install

npm install --save jsonfork

Example

Define the transformer:

var jsonfork = require('jsonfork');

var transformer = new jsonfork({
	source: {
		name: 'Billing',
		schema: {
			"type": "object",
			"properties": {
				"title": { "type": "string" },
				"fromTime": { "type": "string" },
				"toTime": { "type": "string" },
				"customerId": { "type": "string" },
				"items": {
					"type": "array",
					"items": {
						"type": "object",
						"properties": {
							"label": { "type": "string" },
							"price": { "type": "number" },
							"amount": { "type": "number" }
						},
						"required": ["label", "price", "amount"]
					}
				}
			}
		}
	},
	targets: [{
		name: 'Details',
		transform: function(data, bill_opts) {
			return {
				title: data.title + ' [' + data.customerId + ']',
				customerId: data.customerId,
				items: data.items
			}
		},
		eventName: 'BillingDetails'
	},{
		name: 'Summary',
		transform: function(data, bill_opts) {
			var summary = data.items.reduce(function(sum, item) {
				sum.count += item.amount;
				sum.total += item.amount * item.price;
				return sum;
			}, { count: 0, total: 0 });
			if (bill_opts.tax > 0) {
				summary.total *= (1 + bill_opts.tax);
			}
			return {
				title: data.title + ' [' + data.customerId + ']',
				customerId: data.customerId,
				count: summary.count,
				total: summary.total
			}
		},
		schema: {}
	}]
});

transformer.on('BillingDetails', function(result) {
	// save to database
	console.log('Details (from event): %s', JSON.stringify(result));
});

transformer.on('Summary', function(result) {
	// push to log or send back to webpage
	console.log('Summary (from event): %s', JSON.stringify(result));
});

Use transformer to transform json data:

var bill_opts = { tax: 0.1 };

var result = transformer.transform({
	title: 'JsonFork Billing',
	customerId: 'hello.com',
	items: [
		{ label: 'Item#1', price: 15, amount: 2 },
		{ label: 'Item#2', price: 17, amount: 3 }
	]
}, bill_opts);

console.log('Result: %s', JSON.stringify(result, null, 2));