yaml-vs-json-perf.js

const router = require('cmdrouter');
const fs = require('fs-extra');
const yamljs = require('yamljs');
const jsyaml = require('js-yaml');

// USAGE:
// `node yaml-vs-json-perf write` to create the data data yaml and data.json files, and stringify perf measure. 
// `node yaml-vs-json-perf read` to perf measure the parsing.

router({ read, write }).route();

async function write() {
	const itemsCount = 100000;
	const subItemsCount = 3;
	let start, yamlString;
	const docObj = {};
	docObj.items = [];

	// create the docObj
	for (let i = 0; i < itemsCount; i++) {
		const item = { i };
		item.name = `name ${i}`;
		item.description = `description for ${i}`;
		item.subItems = [];
		for (let j = 0; j < subItemsCount; j++) {
			item.subItems.push(`subItem ${i}-${j}`);
		}
		docObj.items.push(item);
	}

	// json
	start = now();
	const jsonString = JSON.stringify(docObj, null, '  ');
	console.log(`json stringify ${Math.round(now() - start)}ms`);
	await fs.writeFile('data.json', jsonString, 'utf8');

	// Generate js-yaml 
	start = now();
	yamlString = jsyaml.dump(docObj, { indent: 2 });
	console.log(`js-yaml stringify ${Math.round(now() - start)}ms`);
	await fs.writeFile('data-jsyaml.yaml', yamlString, 'utf8');

	// Generate yamljs 
	start = now();
	yamlString = yamljs.stringify(docObj, 100, 2);
	console.log(`yamljs stringify ${Math.round(now() - start)}ms`);
	await fs.writeFile('data-yamljs.yaml', yamlString, 'utf8');
}

async function read() {
	let start;
	const jsonString = await fs.readFile('data.json', 'utf8');
	const jsyamlString = await fs.readFile('data-jsyaml.yaml', 'utf8');
	const yamljsString = await fs.readFile('data-yamljs.yaml', 'utf8');

	// pick one to make sure that both are measures with the same input
	const yamlString = yamljsString;

	// json
	start = now();
	JSON.parse(jsonString);
	console.log(`json parsing ${Math.round(now() - start)}ms`);

	// js-yaml
	start = now();
	jsyaml.load(yamlString);
	console.log(`js-yaml parsing ${Math.round(now() - start)}ms`);

	// yamljs
	start = now();
	yamljs.parse(yamlString);
	console.log(`yamljs parsing ${Math.round(now() - start)}ms`);
}



function now() {
	var hrTime = process.hrtime();
	return hrTime[0] * 1000 + hrTime[1] / 1000000;
}