PATCH route/endpoint in Express not working - node.js

Question

Hi I've written the following route for an api endpoint which isn't working. When I test with Postman and my code, it's simply a 404 not found error.
router.patch("/favorite", async (req, res) => {
user = await User.findById(req.body.id)
if (user == null) {
return res.status(404).json({ message: 'Cannot find user' })
}
if (req.body.putArr != null) {
res.user.favPokemon = req.body.putArr;
}
try {
const updatedUser = await res.user.save();
console.log(res.user.favPokemon);
console.log(updateUser);
res.json(updatedUser);
} catch (err) {
res.status(400).json({ error: err.message });
}
});
What am I missing/what error do I have in my code? For reference, here's my mongoDB setup for users:
Edit: Apologies for not specifying the endpoint. To be more clear, the end point and code calling this is:
const favThis = async (e) => { // Patch method to favorite or unfavorite a pokemon
debugger;
e.preventDefault();
try {
console.log(putArr);
const newUser = {userID, putArr};
await axios.patch("http://localhost:5000/users/favorite", newUser);
} catch(err) {
err.response.data.msg && setError(err.response.data.msg)
}
};
, so it's http://localhost:5000/users/favorite. I have other endpoints working fine such as http://localhost:5000/users/login and http://localhost:5000/users/register, and inside server.js I have app.use("/users", require("./routes/users"));
Additionally, server.js is simply
const express = require("express");
const mongoose = require("mongoose");
const cors = require("cors");
require("dotenv").config();
// set up express
const app = express();
app.use(express.json());
app.use(cors());
const PORT = process.env.PORT || 5000;
app.listen(PORT, () => console.log(`The server has started on port: ${PORT}`));
// set up mongoose
mongoose.connect(
process.env.MONGODB_CONNECTION_STRING,
{
useNewUrlParser: true,
useUnifiedTopology: true,
useCreateIndex: true,
},
(err) => {
if (err) throw err;
console.log("MongoDB connection established");
}
);
// set up routes
app.use("/users", require("./routes/users"));
app.use("/todos", require("./routes/todo"));
Edit 2:: I notice now that when I test on Postman, it's an infinite loop and the call is hung. I also get the following warnings in my console:
(node:36447) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag --unhandled-rejections=strict (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
and
(node:36447) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

Answer 1

Based on the warning you have failing code inside a promise which is not being caught. Perhaps in this line user = await User.findById(req.body.id).
Getting a UnhandledPromiseRejectionWarning when testing using mocha/chai