Run results for: JSON.parse() vs. eval()

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_0_0 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/136.0.7103.91 Mobile/15E148 Safari/604.1

Browser: Chrome Mobile iOS 136

Operating system: iOS 18.0.0

Device Platform: Mobile

Date tested: one year ago

JSON.parse()

12.3M/s

eval()

2.3M/s

View exact numbers

Test name	Executions per second
✓ JSON.parse()	12,264,499 Ops/sec
eval()	2,342,962 Ops/sec

Script Preparation code:

var jsonString = '{"key1": "val1", "key2": 7}'

Tests:

JSON.parse()
var dummy = JSON.parse(jsonString);
eval()
eval('var dummy = ' + jsonString);