Run results for: eval vs json parse (working) real

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:144.0) Gecko/20100101 Firefox/144.0

Browser: Firefox 144

Operating system: Windows

Device Platform: Desktop

Date tested: 10 months ago

eval + JSON parse

9.8M/s

direct eval

204/s

View exact numbers

Test name	Executions per second
✓ eval + JSON parse	9,780,606 Ops/sec
direct eval	204 Ops/sec

Script Preparation code:

var jsonObj = (() => {
	let data = [];
	for (let i = 0; i < 10000; ++i) {
		data.push({k1: i, k2: i * 2, k3: i * 3});
	}
	return JSON.stringify(data);
})();
var code1 = "var res1 = " + jsonObj;
var code2 = "var res2 = JSON.parse(" + JSON.stringify(data) + ")";

Tests:

direct eval
eval(code1);
eval + JSON parse
eval(code2);