Get text signature from bytes signature, thanks https://www.4byte.directory/signatures for the free service!

getSignatureMethods.js

import fetch from "node-fetch";

export default async function getSignatureMethods(hash) {
  if (!hash) {
    throw new Error("signature hash is required");
  }

  if (!Buffer.isBuffer(hash)) {
    hash = hash.replace(/^0x/, "");
    hash = Buffer.from(hash, "hex");
  }

  if (hash.byteLength !== 4) {
    throw new Error("Hash size must be 4 bytes");
  }

  const url = `https://www.4byte.directory/api/v1/signatures/?hex_signature=0x${hash.toString(
    "hex"
  )}`;
  const res = await fetch(url);
  const results = (await res.json()).results;

  return results.map((res) => res.text_signature);
}