NodeJS slim function to generate a string that follows the Redis protocol (RESP) from a command name and its args. Inspired by https://redis.io/topics/mass-insert

redis-raw-generator.js

// https://redis.io/topics/protocol

/**
 * @param {string} str
 * @returns {number}
 * (c) https://stackoverflow.com/a/27377098/5290447
 */
function getBinarySize(str) {
  return Buffer.byteLength(str, 'utf8');
}


function generateRedisProtocolVersion(cmd, ...args) {
  return [
    "*" + cmd.length,
  ].concat(
    (args || []).map(arg => ["$" + getBinarySize(arg), arg]).flat()
  )
  .join("\r\n")
}


console.log(
  generateRedisProtocolVersion("SET", "key", "value")
  /*
*3<cr><lf>
$3<cr><lf>
SET<cr><lf>
$3<cr><lf>
key<cr><lf>
$5<cr><lf>
value<cr><lf>
   */
)