The endpoints that are created with node.jsdoes not work properly? - node.js

Question

I have a 2 different endpoint in index.js file. The android app calls and retrieves data with these endpoints from local MongoDB database. The first endpoint "/AddArac" works fine in starting but if ı Call "/AddArac" after calling "/ListArac" it gives an error.
For example:
/AddArac - /ListArac => this order is ok for both.
/ListArac - /AddArac => this order is not ok for /AddArac.
var mongodb = require('mongodb');
var objectID = mongodb.ObjectID;
var express = require('express');
var bodyparser = require('body-parser');
var app = express();
app.use(bodyparser.json());
app.use(bodyparser.urlencoded({ extended: true }));
var mongoClient = mongodb.MongoClient;
var url = 'mongodb://localhost:27017'
app.post('/AddArac', (request, response, next) => {
mongoClient.connect(url, { useNewUrlParser: true }, function (err, client) {
var db = client.db('basaranSMSDev');
var data = request.body;
var name = data.name;
var plaka = data.plaka;
var tel = data.tel;
var json = { 'name': name, 'plaka': plaka, 'tel': tel };
db.collection('Araclar').find({ 'plaka': plaka }).count(function (error, number) {
if (number > 0) {
response.json('Araç daha önce kaydedilmiş.');
}
else {
db.collection('Araclar').insertOne(json, function (error, res) {
if (err) {
res.json('Araç kaydında hata oluştu tekrar deneyiniz.');
console.log('Arac eklenemedi', err);
}
else {
res.json('Araç eklendi');
console.log('Arac eklendi.');
}
});
}
client.close();
});
});
});
app.get('/ListArac', (req, res) => {
mongoClient.connect(url, { useNewUrlParser: true }, function (err, client) {
var db = client.db('basaranSMSDev');
var items = db.collection('Araclar').find().toArray();
items.then(function (result) {
console.log(result)
res.json(result)
})
console.log(items);
client.close();
});
})
The error:
C:\Users\Dilber\Basarannodejs\node_modules\mongodb\lib\utils.js:106
throw err;
^
TypeError: res.json is not a function
at C:\Users\Dilber\Basarannodejs\index.js:138:29
at executeCallback (C:\Users\Dilber\Basarannodejs\node_modules\mongodb\lib\operations\execute_operation.js:70:5)
at C:\Users\Dilber\Basarannodejs\node_modules\mongodb\lib\operations\insert_one.js:34:21
at handleCallback (C:\Users\Dilber\Basarannodejs\node_modules\mongodb\lib\utils.js:102:55)
at C:\Users\Dilber\Basarannodejs\node_modules\mongodb\lib\operations\common_functions.js:269:5
at C:\Users\Dilber\Basarannodejs\node_modules\mongodb\lib\core\connection\pool.js:405:18
at processTicksAndRejections (node:internal/process/task_queues:75:11)

Answer 1

in your code
app.post('/AddArac', (request, response, next) => {
you have used response as the response parameter.
but you used res in
if (err) {
res.json('Araç kaydında hata oluştu tekrar deneyiniz.');
res is not a function in
db.collection('Araclar').insertOne(json, function (error, res) {