Run results for: JSON.parse vs string.indexOf

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/118.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 118

Operating system: Android

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
JSON.parse	901328.2 Ops/sec
String.indexOf	11367200.0 Ops/sec

Script Preparation code:

var json = JSON.stringify({
  "type": "l2update",
  "product_id": "BTC-USD",
  "time": "2019-08-14T20:42:27.265Z",
  "changes": [
    [
      "buy",
      "10101.80000000",
      "0.162567"
    ]
  ]
});

Tests:

JSON.parse
var o = JSON.parse(json); if (o.type === 'l2update') { // do something cool }
String.indexOf
if (json.indexOf('l2update') !== -1) { // do something cool }

Run results for: JSON.parse vs string.indexOf

When discriminating a JSON string to determine action, which is faster?

JSON.parse

String.indexOf