Run results for: JSON parse inside eval

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/141.0.0.0 Safari/537.36

Browser: Chrome 141

Operating system: Windows

Device Platform: Desktop

Date tested: 10 months ago

direct eval

13K/s

eval + JSON parse

1K/s

View exact numbers

Test name	Executions per second
✓ direct eval	13,219 Ops/sec
eval + JSON parse	1,227 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(jsonObj) + ")";

Tests:

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