Set up express middlewares inside the server.js to receive body data

app.use(express.json());

Set up error handler for the post route

const createQuote = (req, res) => {
if (!req.body) {
    res.status(400);
    throw new Error("Please add a quote and author field");
  }
  res.status(200).json({ message: "Create quote" });
};

Set up error handler for the update route

const updateQuote = (req, res) => {
  if (!goal) {
    res.status(400);
    throw new Error("Goal not found");
  }
  res.status(200).json({ message: `Update quote, ${req.params.id}` });
};

Set up error handler for the delete route

const deleteQuote = (req, res) => {
  if (!goal) {
    res.status(400);
    throw new Error("Goal not found");
  }
  res.status(200).json({ message: `Delete quote, ${req.params.id}` });
};

Change the default express error by adding error handler middleware in an errorMiddleware.js file inside a middleware folder to be created

const errorHandler = (err, req, res, next) => {
  const statusCode = res.statusCode ? res.statusCode : 500;

  res.status(statusCode);

  res.json({
    message: err.message,
    stack: process.env.NODE_ENV === "production" ? null : err.stack,
  });
};

You might need this later

module.exports = {
  errorHandler,
};

Bring in the error handler middleware into server.js and use it

const { errorHandler } = require("./middleware/errorMiddleware");

app.use(errorHandler);

Test the post route to make sure the error handler is working by inputting no data to the body

errortest