NodeJS :: TypeError: Cannot read property 'first_name' of undefined
I studied the MEAN stack from the tutorial. When I tried on my localhost I got an error.
TypeError: Cannot read property 'first_name' is undefined
at router.post (/var/www/html/mean/contactlist/routes/route.js:17:28)
I found some similar questions on the internet. But I haven't found the right solution.
Here is my app.js file
//importing modules
var express = require('express');
var mongoose = require('mongoose');
var bodyparser = require('body-parser');
var cors = require('cors');
var path = require('path'); //core module
// calling express method
var app = express();
//connect to mongodb
mongoose.connect('mongodb://localhost/27017/contactlist');
//on connection
mongoose.connection.on('connected', () => {
console.log("connected to database database mongodb @ 27017 ");
});
mongoose.connection.on('error', (err) => {
if(err){
console.log('Error in Database connection : ' + err);
}
});
//adding middleware cors
app.use(cors());
//adding body parser
app.use(bodyparser.json());
//adding static files
app.use(express.static(path.join(__dirname, 'public')));
//setting port no
const port = 3000;
//routing
var route = require('./routes/route');
//using the route
app.use('/api', route);
//testing server
app.get('/', (req, res)=>{
res.send('foobar');
});
//binding the server with port no (callback)
app.listen(port,() =>{
console.log('Server Started at Port : '+ port);
});
In the stackOverflow solution I found,
I have to use the following line before routing
app.use(bodyparser.json());
So I changed it.
And my ./routes/route.js
const express = require('express');
const router = express.Router();
const Contact = require('../models/contacts');
//Retrieving contacts
router.get('/contacts', (res, req, next) => {
contact.find(function(err,contacts){
res.json(contacts);
})
});
//Add contact
router.post('/contact', (res, req, next) => {
let newContact = new Contact({
first_name:req.body.first_name,
last_name:req.body.last_name,
phone:req.body.phone
});
newContact.save((err,contact) => {
if(err){
res.json({msg : 'Failed to add contact'});
}
else{
res.json({msg : 'Contact added successfully'});
}
});
});
//Deleting Contact
router.delete('/contact/:id', (res, req, next) => {
contact.remove({_id: req.params.id }, function(err, result){
if(err){
res.json(err);
}
else{
res.json(result);
}
});
});
module.exports = router;
Depending on package.json
"dependencies": {
"body-parser": "^1.17.1",
"cors": "^2.8.3",
"express": "^4.15.2",
"mongoose": "^4.9.8"
}
And the nodejs version is
v7.10.0
I used Postman to test the API
So, I tested the POST method and the following content type.
{"Content-Type":"application/x-www-form-urlencoded"}
This was my example input
{
"first_name" : "RENJITH",
"last_name" : "VR",
"phone" : "1234567890"
}
Is this a version issue? Please suggest me the correct way to code.
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Your Content Type {"Content-Type":"application/x-www-form-urlencoded"}
To support URL-encoded data bodies, you should use this:
app.use(bodyparser.urlencoded({ // to support URL-encoded bodies
extended: true
}));
What did you use for JSON encoded data like POST: {"name":"foo","color":"red"}
EDIT:
The order of your route parameters is incorrect. Is notrouter.post('/contact', (res, req, next)
In fact router.post('/contact', (req, res, next)
The first parameter is the request, the second is the response.
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