NodeJS TypeError: Cannot read property of undefined

NodeJS TypeError: Cannot read property of undefined

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NodeJS TypeError: Cannot read property of undefined
Tag : javascript , By : Jonathan
Date : December 05 2020, 12:23 PM

I wish this helpful for you This looks a little different from how Node modules are typically written.
There's a great resource on how to write them here.
function User() {
  this.info = {
    'strUsername': 'Hashimoro'

User.prototype.getInfo = function() {
  return this.info;

module.exports = User;
var Person = require('./UserEntity.js');
var person = new Person();


// OR

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TypeError: Cannot read property 'id' of undefined in nodejs

Tag : javascript , By : Keonne Rodriguez
Date : March 29 2020, 07:55 AM
I wish this helpful for you I'm struggling to make a function which selects from database based on the id entered in a textbox. I wrote the code, but it shows in console this error and I can't figure why: TypeError: Cannot read property 'id' of undefined. , Make sure you've required body-parser. And use bodyParser.urlencoded.
var bodyParser = require('body-parser');

app.use(bodyParser.urlencoded({ extended: false }));

NodeJs TypeError: Cannot read property 'key' of undefined

Tag : node.js , By : Xander
Date : March 29 2020, 07:55 AM
I hope this helps . It looks like 'postmark' isn't set in your firebase configuration. You can set what's retrieved by functions.config() using the CLI: https://firebase.google.com/docs/functions/config-env

NodeJS - TypeError: Cannot read property 'name' of undefined

Tag : node.js , By : CyberGreg
Date : March 29 2020, 07:55 AM
I wish did fix the issue. TypeError: A TypeError is thrown when an operand or argument passed to a function is incompatible with the type expected by that operator or function.
The possible cause is your props is not loaded correctly and doesn't include any property help, thus accessing property name of unknown property help throws TypeError. Similar to following:
let obj = {
    o1: {
        a: 'abc'

obj.o1     // gives {a: 'abc'}, as o1 is property obj which is an object.
obj.o1.a   // gives 'abc', as a is property of o1, which is property of obj.
obj.o2     // undefined, as there's no o2 property in obj.
obj.o2.a   // TypeError as there's no o2 property of obj and thus accessing property a of undefined gives error. 

NodeJS: TypeError: Cannot read property 'json' of undefined

Tag : javascript , By : Elwillow
Date : March 29 2020, 07:55 AM
I wish this help you There's a famous saying which says that you can solve almost any problem in CS by adding another layer of indirection. This is one of those cases:
Instead of of declaring your module as:
module.exports = {
  async update(req, res) {
    const currency = await Currency.findByIdAndUpdate(req.params.id, req.body, {
      new: true
    return res.json(currency);
module.exports = {

  async getCurrency(id, params) {
      const currency = await Currency.findByIdAndUpdate(id, params, {
        new: true
      return currency;

  async update(req, res) {
    const currency = await getCurrency(req.params.id, req.body);
    return res.json(currency);

TypeError: Cannot read property 'match' of undefined on NodeJs

Tag : node.js , By : Al Dimond
Date : December 16 2020, 02:45 PM
seems to work fine I cannot see process.env.BOT_KEY declared anywhere. So basically the Key is undefined.
To set the BOT_KEY environment variable, you should start node with
BOT_KEY='something' node <filename>
// or 
export the BOT_KEY 
// or 
use `dotenv` and set the config in the config file.
const bot = bb({
  key: process.env.BOT_KEY || "some secret key",
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