Question: One of the reasons that I moved from emacs to vim was to avoid awkward keybindings such as Ctrl+N and Ctrl+P for up and down. I would prefer more ergonomic keys like hjkl. However, I didn't find a way to navigate in Omnicomplete box without using arrow keys or Ctrl+N/P.

Does vim provide other keys for up and down?

![enter image description here](https://i.stack.imgur.com/nwyyr.png)

Answer: 
If you successfully installed EXPRESS but then also you get
***ReferenceError: express is not defined.***

Then,

just put name of variable in first line and function name in second line same like this:-

```
var express = require('express');  
var app = express();

```

Not Like This:-

```
var exp = require('express');  
var app = express();

```
use this command in your terminal npm install express

make sure install inside your project folder