MongoDB - RestAPI- ExpressJS - Put Method does not appear to be working - node.js

Question

I'm attempting to build my first REST API using MongoDB and Node.
I'm using Postman to test the API.
all of the methods appear to be working, but I currently cannot update any "articles" in my database, using the post method.
I'm essentially trying to edit the "title" and "content" of the articles, but Postman is returning ("update not successful").
//jshint esversion:6
const express = require("express"); //creating four constant, and requiring the modules
const bodyParser = require("body-parser");
const ejs = require("ejs");
const mongoose = require('mongoose');
const app = express();
app.set('view engine', 'ejs');
app.use(bodyParser.urlencoded({ //parse requests
extended: true
}));
app.use(express.static("public")); //public directory to store static files
mongoose.connect("mongodb://localhost:27017/wikiDB", { useNewUrlParser: true }); // connect to local database
const articleSchema = { //created article schema
title: String,
content: String
};
const Article = mongoose.model("Article", articleSchema); //created article model
//Requests Targetting all Articles
app.route("/articles")
.get(function (req, res) {
Article.find(function (err, foundArticles) { //search through articles and send to client
if (!err) {
res.send(foundArticles);
} else {
res.send(err);
}
});
})
.post(function (req, res) {
console.log(req.body.title);
console.log(req.body.content);
const newArticle = new Article({
title: (req.body.title),
content: (req.body.content)
});
newArticle.save(function (err) {
if (!err) {
res.send("Successfully added a new article");
} else {
res.send(err);
}
});
})
.delete(function (req, res) {
Article.deleteMany(function (err) {
if (!err) {
res.send("Succesfully deleted all articles.");
} else {
res.send(err);
}
});
});
///request targeting a specific article/////////////////
app.route("/articles/:articleTitle") // match request parameters
.get(function (req, res) {
Article.findOne({ title: req.params.articleTitle },
function (err, foundArticle) {
if (foundArticle) {
res.send(foundArticle);
} else {
res.send("No articles matching that title was found");
}
});
})
.put(function (req, res) {
Article.updateMany(
{ title: req.params.articleTitle },
{ title: req.body.title, content: req.body.content },
{ overwrite: true },
function (err) {
if (!err) {
console.log("success")
res.send("successfully updated article")
} else {
res.send("update not successful");
console.log("error")
}
}
);
});
app.listen(3000, function () {
console.log("Server started on port 3000"); //listen on port
});

Answer 1

Add app.use(bodyParser()); to your code, like this:
app.use(bodyParser());
app.use(bodyParser.urlencoded({extended: true}));
You are supposed to use the update method instead of the updateMany method, as you are updating a single entry in the database.
For information: The body parser you are using is deprecated. If you are using Express >= 4.16.0, then you can use this: express.json() and express.urlencoded() by replacing your body parser code with this:
app.use(express.json());
app.use(express.urlencoded({ extended: true }));
Hope everything works now.