Convert an uint8 array to a base64 encoded string

JavaScript version

const uint8ToBase64 = (arr) =>
    btoa(
        Array(arr.length)
            .fill('')
            .map((_, i) => String.fromCharCode(arr[i]))
            .join('')
    );

// For Node.js
const uint8ToBase64 = (arr) => Buffer.from(arr).toString('base64');

TypeScript version

const uint8ToBase64 = (arr: Uint8Array): string =>
    btoa(
        Array(arr.length)
            .fill('')
            .map((_, i) => String.fromCharCode(arr[i]))
            .join('')
    );

// For Node.js
const uint8ToBase64 = (arr: Uint8Array): string => Buffer.from(arr).toString('base64');

See also

• Convert a base64 encoded string to an uint8 array