# Hosting NodeJs Application on Heroku Platform using Heroku CLI

In this blog, we will learn how to `Host` NodeJs Application on `Heroku` Platform using `Heroku CLI`. No need to leave your terminal or code editor, all from the terminal itself, huh?, pretty cool, right? Let's see how we can achive this.

Pre-requisite
-------------

-   [Heroku cli](https://devcenter.heroku.com/articles/heroku-cli)
-   [Heroku Account](https://www.heroku.com/)

Logging Into Heroku
-------------------

Heroku login is required once. Enter below command in your terminal and follow up the prompt window and `Authorize`
```
heroku login
```

Specify the version of node
---------------------------

Add The version of Node.js to your `package.json` file:

```
"engines": {
    "node": "10.x"  // replace x with your node version like 10.16.2
},
```

Specifying a start script
-------------------------

create a `Procfile` file inside the root directory of the project and add the below code in it

```
web: node app.js
```

By default, Heroku will look into our `package.json` file under the scripts section and grab `start` command. Sometimes we won't have that defined or it will be different from what we want the server to execute. We can specify the exact command we want by creating a `Procfile` file.

Create Heroku App and Remote Repository on Heroku
-------------------------------------------------

Specify a unique name for your application, this name should be globally unique.

```
heroku create <app-name>
```
example:

```
heroku create todo-app-rest-backend-nodejs
```

​Rename Your APP - Optional
---------------------------

If you got `random` app name or if you want to rename your Heroku app then use the below command to achieve it from the terminal itself.

```
heroku apps:rename <new-app-name> --app <old-app-name>
```

​Build your app and run it locally - Optional
---------------------------------------------

```
heroku local web
```
Deploying Code To Heroku
------------------------

```
git push heroku master
```
`Once the build and deployment is successful you will receive the url of the Hosted Application in your terminal.`

If your Project has Environment Variables then Follow Below Along
-----------------------------------------------------------------

### Set a config variables on heroku app

Use below command for each environment variable to set all of your env variables and you are done.

```
heroku config:set <environment-variable-name>=<value>
```

### Examples:
```
heroku config:set GITHUB_USERNAME=joesmith
```

```
heroku config:set PORT=3000
```

`Congratulations!! You had successfully learned how to host the NodeJS application on Heroku Like a PRO`