function displayBufferContents(buf) {
    const byteString = Array.from(new Uint8Array(buf.buffer), (byte) =>
        String.fromCharCode(byte),
    ).join('')

    return byteString.replaceAll(/\u0000+/g, (m) => `{...${m.length}}`)
}

const secretKeyBuffer = Buffer.from('SECRET KEY PLEASE DO NOT STEAL')

displayBufferContents(Buffer.from('arbitrary text'))
// /{...7}/{...7}SECRET KEY PLEASE DO NOT STEAL{...2}arbitrary text{...8130}