Resolving UnhandledPromiseRejectionWarning in express post request - node.js

Question

I am trying to make a post request to the server (mongodb) but I get this error:
UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'todo_description' of undefined
I am running mongodb on my localhost
// Require Express
const express = require("express");
// Setting Express Routes
const router = express.Router();
// Set Up Models
const Todo = require("../models/todo");
// Get All Todos
router.get("/", async (req, res) => {
try {
const todo = await Todo.find();
res.json(todo);
} catch (err) {
res.json({ message: err });
}
});
router.get("/:id", async (req, res) => {
try {
const id = req.params.id;
await Todo.findById(id, (err, todo) => {
res.json(todo);
});
} catch (err) {
res.json({ message: err });
}
});
router.post("/add", async (req, res) => {
const todo = new Todo({
todo_description: req.body.todo_description,
todo_responsible: req.body.todo_responsible,
todo_priority: req.body.todo_priority,
todo_completed: req.body.todo_completed,
});
try {
await todo.save();
res.json(todo);
} catch (err) {
res.json({ message: err });
}
});
router.patch("/update/:id", async (req, res) => {
try {
const updateTodo = await Todo.updateOne(
{ _id: req.params.id },
{ $set: { todo_description: req.body.todo_description } }
);
updateTodo.save().then(updateTodo => {
res.json(updateTodo);
});
} catch (err) {
res.json({ message: err });
}
});
router.delete("/delete/:id", async (req, res) => {
try {
const deleteTodo = await Todo.deleteOne({ _id: req.params.id });
res.json(deleteTodo);
} catch (err) {
res.json({ message: err });
}
});
module.exports = router;
my todo model
// Require Mongoose
const mongoose = require("mongoose");
// Define Schema
// const Schema = new mongoose.Schema;
// Define Todo-Schema
const TodoSchema = new mongoose.Schema({
// Creating Fields
todo_description: {
type: String
},
todo_responsible: {
type: String
},
todo_priority: {
type: String
},
todo_completed: {
type: Boolean
},
todo_date: {
type: Date,
default: Date.now
}
});
// Compile Model From Schema
// const TodoModel = mongoose.model("Todos", TodoSchema);
// Export Model
module.exports = mongoose.model("todos", TodoSchema);
error message:
(node:548) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'todo_description' of undefined
at router.post (C:\Users\kinG\Desktop\projects\mountain-of-prototype\mern\backend\routes\todo.js:33:32)
at Layer.handle [as handle_request] (C:\Users\kinG\Desktop\projects\mountain-of-prototype\mern\backend\node_modules\express\lib\router\layer.js:95:5)
thank you

Answer 1

You are accessing todo_description from req.body. req.body will only be available if you add the body-parser middleware or add a similar one yourself.
Add this right before your routes are loaded :
const bodyParser = require('body-parser');
const express = require('express');
const app = express();
app.use(bodyParser.json());
You can also add this to a specific route. Read more about it here.

Answer 2

You should use body-parser in your master file of the application. Which gives you the parsed json before your middle-ware parse the body, which by-default in string. And also make sure you are sending todo_description in the req.body(should check before use).
const bodyParser = require('body-parser');
app.use(bodyParser.json());