Run results for: JSON.stringify vs string concat simple

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0

Browser: Firefox 88

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
JSON.stringify	15811.7 Ops/sec
string concat	9107.6 Ops/sec

Script Preparation code:

var testData = {};

for (let i = 0; i < 1000; i++) {
 testData[i.toString()] = "bla" + i; 
}

Tests:

JSON.stringify
const data = JSON.stringify(testData);
string concat
let str = "{"; Object.keys(testData).forEach((k) => { str += "\"".concat(k).concat("\":\"").concat(testData[k]).concat("\","); }); str = str.substring(0, str.length - 1); str += "}";