Benchmark: JavaScript Uint8Array to Base64: btoa vs btoa concat vs btoa concat byte

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);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
btoa 1K
btoa 32K
btoa 64K
btoa 1M
btoa concat 1K
btoa concat 32K
btoa concat 64K
btoa concat 1M
btoa concat byte 1K
btoa concat byte 32K
btoa concat byte 64K
btoa concat byte 1M

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 8 months ago)

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/OS: Chrome 142 on Windows

View result in a separate tab

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

JavaScript Uint8Array to Base64: btoa vs btoa concat vs btoa concat byte (version: 1)

Comparing performance of: `btoa 1K vs btoa 32K vs btoa 64K vs btoa 1M vs btoa concat 1K vs btoa concat 32K vs btoa concat 64K vs btoa concat 1M vs btoa concat byte 1K vs btoa concat byte 32K vs btoa concat byte 64K vs btoa concat byte 1M`

Created: 8 months ago by: Guest

Go to the latest result

btoa 1K

btoa 32K

btoa 64K

btoa 1M

btoa concat 1K

btoa concat 32K

btoa concat 64K

btoa concat 1M

btoa concat byte 1K

btoa concat byte 32K

btoa concat byte 64K

btoa concat byte 1M

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

JavaScript Uint8Array to Base64: btoa vs btoa concat vs btoa concat byte (version: 1)

Comparing performance of: btoa 1K vs btoa 32K vs btoa 64K vs btoa 1M vs btoa concat 1K vs btoa concat 32K vs btoa concat 64K vs btoa concat 1M vs btoa concat byte 1K vs btoa concat byte 32K vs btoa concat byte 64K vs btoa concat byte 1M

Created: 8 months ago by: Guest

Go to the latest result

btoa 1K

btoa 32K

btoa 64K

btoa 1M

btoa concat 1K

btoa concat 32K

btoa concat 64K

btoa concat 1M

btoa concat byte 1K

btoa concat byte 32K

btoa concat byte 64K

btoa concat byte 1M

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `btoa 1K vs btoa 32K vs btoa 64K vs btoa 1M vs btoa concat 1K vs btoa concat 32K vs btoa concat 64K vs btoa concat 1M vs btoa concat byte 1K vs btoa concat byte 32K vs btoa concat byte 64K vs btoa concat byte 1M`