I'm creating a REST API using Node js and expressJs, but suddenly I have faced a problem when I tried to create a user then I can create it like this way:

/**
 * save user data from the user model
 */

router.post("/users", async (req, res) => {
  const user = new User(req.body);

  try {
    await user.save();
    res.status(201).send( user);
  } catch (e) {
    res.status(400).send(e);
  }
});

after creating a user I can see a response in postman.

But When I tried to go /users/login routes then I have faced a problem it shows me 400 bad requests also can't get any response. here is my code:

/**
 * User login.
 */

router.post("/users/login", async (req, res) => {
  try {
    const user = await User.findByCredentials(
      req.body.email,
      req.body.password
    );
    res.send( user);
  } catch (e) {
    res.status(400).send();
  }
});

/**
 * user login crendentials
 */

userSchema.statics.findByCredentials = async (email, password) => {
  const user = await User.findOne({ email });

  if (!user) {
    throw new Error("Unable to login");
  }

  const isMatch = await bcrypt.compare(password, user.password);

  if (!isMatch) {
    throw new Error("Unable to login");
  }
  
};

Any suggestion will highly appreciated Thanks.