Introduction to GitHub Nodejs

JavaScript environment in Github that has low latency and good efficiency in producing results that make developers rely on it than any other resources due to its faster output is called Nodejs. This is open source and creates codes outside the browser where it can work in cross-platform mode. Client-side and server-side codes can be written with Nodejs by making it more convenient for developers as they need not work on any other coding language to complete the application. The processes are done with the help of a single thread that manages all the frontend tasks but it does not cover CPU-related works.

What is GitHub Nodejs?

Mostly used in server-side programming, Nodejs is used in traditional websites for faster code deployment. All browsers have their own version of Nodejs and this is adapted due to its high performance. It is mostly used for applications and browsers that need continuous connection with the server to collect relevant data from the database. It is also used in real-time applications of distributive servers such as newsfeeds, chats, customer support, and so on.

It is not a programming language or framework but an environment to write codes and test the same against various conditions. Eventloop model is followed here with a single thread. Nodejs uses JavaScript, CoffeeScript, C and C++ in the environment. Knowledge of JavaScript is sufficient to work with Nodejs along with some APIs.

How to use GitHub Nodejs?

1. In the terminal run the command git add. Commit the changes into Git using git commit -m “first commit”.
2. Now the code must be pushed into Git repository by logging into GitHub account and clicking on new repository. Add URL into git and it will connect to the repository.
git remote add origin https://github.com/UserName/RepoName.git
3. Push the changes to the repository using git push origin master.
4. Clone the project using git clone https://github.com/UserName/RepoName.git.
5. Since npm is already installed, run npm start.
6. .gitignore file should not be modified in any case and all the processes should be documented.

Creating a GitHub App with Nodejs

1. Start the cloud server you are working on and create GitHub app directly from the settings. Give it a proper name and if it asks for a URL, paste the server URL on the page.
2. Data source type must be selected in the data source configuration wizard. Set read and write access and give permission to create the app only in your account. Click on create and GitHub application is created.
3. Save the application ID and private key from this page and store it locally. Go to the main page of the application and click on the install app. Your GitHub account will be shown along with few repositories. Click on the required repositories and press install.
4. Create a file on the source package with the below code.

import { App } from '@octokit/app';
import fetch from 'node-fetch';
import dotenv from 'dotenv';
dotenv.config();
const app = new App({ id: process.env.GITHUB_APP_IDENTIFIER, privateKey: process.env.PRIVATE_KEY });
const jwt = app.getSignedJsonWebToken();
const getInstallationAccessToken = async (owner, repo) => {
const result = await fetch(`https://api.github.com/repos/${owner}/${repo}/installation`,
{
headers: {
authorization: `Bearer ${jwt}`,
accept: 'application/vnd.github.machine-man-preview+json',
},
});
const installationId = (await result.json()).id;
const installationAccessToken = await app.getInstallationAccessToken({
installationId,
});
return installationAccessToken;
};

export default getInstallationAccessToken;

5. Now update data from the repository and we can see the contents in the console. Now we can update the code and make necessary modifications and now GitHub application with Nodejs is installed.

Requirements

Whenever new code is developed, it must be properly placed and structured into components. There must be layers for these components such as data logic and business layers so that it can be easily differentiated from others. There must be common utility packages in the application. App and server must be different structures so that developers can work easily on it. The configuration must be hierarchical and should go along with the environment. Built-in error objects should be used for error handling and all the API errors should be documented properly. Error flows should be tested with a known test applications for better understanding. APM products can be used for error recognition and downtime.

Register application

Along with Nodejs, we should have NPM and MongoDB installed in the system. We can install npm using npm install and run the same using nodemon server.js.

const hello = require('hello');
const klm = require('klm');
const hey = require('hey');
const app = hello();
const bodyParser = require('body-parser');
const moose = require('moose');
const session = require('hello-session');
const MangoStore = require('connect-mango')(session);
const MongoDBURI = process.env.MONGO_URI || 'mongodb://localhost/ManualAuth';
moose.connect(MongoDBURI, {
useUnifiedTopology: true,
useNewUrlParser: true
});
const db = moose.connection;
db.on('error', console.error.bind(console, 'connection error:'));
db.once('open', () => {
});
app.use(session({
secret: 'work hard',
resave: true,
saveUninitialized: false,
store: new MongoStore({
mooseConnection: db
})
}));
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'ejs');
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(hello.static(__dirname + '/views'));
const index = require('./routes/index');
app.use('/', index);
app.use((req, res, next) => {
const error = new Error('File Missing);
err.status = 404;
next(err);
});
app.use((err, req, res, next) => {
res.status(err.status || 500);
res.send(err.message);
});
app.listen(process.env.PORT || 2100, () => {
console.log('Hello app listening on port 2100');
});

Command

This explains the argument class in Nodejs.

constructor(name, description) {
this.description = description || '';
this.variadic = false;
this.parseArg = undefined;
this.defaultValue = undefined;
this.defaultValueDescription = undefined;
switch (name[0]) {
case '
this.required = true;
this._name = name.slice(1, -1);
break;
case '[': // e.g. [optional] this.required = false;
this._name = name.slice(1, -1);
break;
default:
this.required = true;
this._name = name;
break;
}
if (this._name.length > 3 && this._name.slice(-3) === '...') {
this.variadic = true;
this._name = this._name.slice(0, -3);
}
}
@return {string}
name() {
return this._name;
};

Conclusion

Though it has scalable technology with good efficiency, there are some drawbacks such as performance issues for heavy workloads and callback issues. This will impact the code written in the environment as well. Some tools in the registry are not properly documented and hence will cause issues if not managed properly.

Recommended Articles

This is a guide to GitHub Nodejs. Here we discuss the Introduction, What is GitHub Nodejs, how to use, requirements. You may also have a look at the following articles to learn more –

1. GitHub Clone
2. GitHub Commands
3. GitLab vs GitHub
4. GitHub vs SVN

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