Run results for: JavaScript Uint8Array to Base64: btoa vs btoa concat vs btoa concat byte

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser: Chrome 142

Operating system: Windows

Device Platform: Desktop

Date tested: 8 months ago

btoa concat 1K

219K/s

btoa concat byte 1K

212K/s

btoa 1K

96K/s

btoa concat 32K

7K/s

btoa concat byte 32K

6K/s

btoa concat 64K

4K/s

btoa 32K

3K/s

btoa concat byte 64K

2K/s

btoa 64K

2K/s

btoa concat 1M

84/s

btoa concat byte 1M

83/s

btoa 1M

57/s

View exact numbers

Test name	Executions per second
✓ btoa concat 1K	219,027 Ops/sec
btoa concat byte 1K	212,138 Ops/sec
btoa 1K	95,933 Ops/sec
btoa concat 32K	7,409 Ops/sec
btoa concat byte 32K	5,842 Ops/sec
btoa concat 64K	3,503 Ops/sec
btoa 32K	3,088 Ops/sec
btoa concat byte 64K	2,347 Ops/sec
btoa 64K	1,530 Ops/sec
btoa concat 1M	84 Ops/sec
btoa concat byte 1M	83 Ops/sec
btoa 1M	57 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

function bytesToBase64ByBtoa(bytes) {
    return btoa(bytes.reduce((data, byte) => data + String.fromCharCode(byte), ""));
}

function bytesToBase64ByBtoaConcat(bytes) {
    let binary = "";
    for (let i = 0; i < bytes.length; i++) {
      binary += String.fromCharCode(bytes[i]);
    }
    return btoa(binary);
}

function bytesToBase64ByBtoaByte(bytes) {
    let binary = "";
    for (let i = 0; i < bytes.byteLength; i++) {
      binary += String.fromCharCode(bytes[i]);
    }
    return btoa(binary);
}

const bytes1K = new Uint8Array(1024);
const bytes32K = new Uint8Array(32768);
const bytes64K = new Uint8Array(65536);
const bytes1M = new Uint8Array(1048576);
for (const bytes of [bytes1K, bytes32K, bytes64K, bytes1M])
    for (let i = 0; i < bytes.length; i += 65536)
        crypto.getRandomValues(bytes.subarray(i, i + 65536));

Tests:

btoa 1K
bytesToBase64ByBtoa(bytes1K);
btoa 32K
bytesToBase64ByBtoa(bytes32K);
btoa 64K
bytesToBase64ByBtoa(bytes64K);
btoa 1M
bytesToBase64ByBtoa(bytes1M);
btoa concat 1K
bytesToBase64ByBtoaConcat(bytes1K);
btoa concat 32K
bytesToBase64ByBtoaConcat(bytes32K);
btoa concat 64K
bytesToBase64ByBtoaConcat(bytes64K);
btoa concat 1M
bytesToBase64ByBtoaConcat(bytes1M);
btoa concat byte 1K
bytesToBase64ByBtoaByte(bytes1K);
btoa concat byte 32K
bytesToBase64ByBtoaByte(bytes32K);
btoa concat byte 64K
bytesToBase64ByBtoaByte(bytes64K);
btoa concat byte 1M
bytesToBase64ByBtoaByte(bytes1M);