Convert this Promise based code into Async / Await?

Question

A colleague want to refactor the backend code of a project into Async/Await, which I barely ever used.

I know how it works, but it's kind of strange to write code this way at the beginning.

router.post("/register", async (req, res) => {
  const { firstName, lastName, email, password } = req.body;

  bcrypt.hash(password, 10).then((hash) => {
    User.create({
      firstName: firstName,
      lastName: lastName,
      email: email,
      password: hash,
    });
    res.json("User created!");
  });
});

How would you refactor this simple piece of code, for example? Thanks!!!

const hash = await bcrypt.hash(password, 10); the rest should be self explanatory — Jaromanda X
– Jaromanda X, Commented Jun 30, 2021 at 9:57
@JaromandaX and the entire code in the then is them moved after that line. — VLAZ
– VLAZ, Commented Jun 30, 2021 at 9:58
well, yes, self explanatory @VLAZ :p especially since the OP says "I know how it works" — Jaromanda X
– Jaromanda X, Commented Jun 30, 2021 at 9:59
@JaromandaX wrote the comment before I saw the edited the comment. But I agree. — VLAZ
– VLAZ, Commented Jun 30, 2021 at 10:00

kaffarell · Accepted Answer · 2021-06-30 10:08:01Z

1

Probably like this:

router.post("/register", async (req, res) => {
    const { firstName, lastName, email, password } = req.body;
    
    const hash = await bcrypt.hash(password, 10);
    User.create({
        firstName: firstName,
        lastName: lastName,
        email: email,
        password: hash,
    });
    res.json("User created!");
});

answered Jun 30, 2021 at 10:08

kaffarell

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subrahmanya bhat · Accepted Answer · 2021-06-30 10:41:55Z

1

You can do this by simply adding await while calling hash function

router.post("/register", async (req, res) => {
  const { firstName, lastName, email, password } = req.body;

  try {
    const hash = await bcrypt.hash(password, 10);
    User.create({
      firstName: firstName,
      lastName: lastName,
      email: email,
      password: hash,
    });
  } catch (e) {
    // --- "your .catch() method would go here" ---
  }

  res.json("User created!");
});

answered Jun 30, 2021 at 10:41

subrahmanya bhat

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