In an effort to learn node js .This gist consists of some code snippets and small chunk texts that helped me to learn node.

nodelearn.markdown

Learn Me Node

A Node.js application involves following 3 steps :

• Import required modules − We use the require directive to load Node.js modules.
• Create server − A server which will listen to client’s requests similar to Apache HTTP Server.
• Read request and return response − The server created in an earlier step will read the HTTP request made by the client which can be a browser or a console and return the response.

http server

const http = require('http');

const hostname = '127.0.0.1';
const port = 3333;
const server = http.createServer((req, res) => {
  res.statusCode = 200;
  res.setHeader('Content-Type', 'text/plain');
  res.end('Hello World\n');
});
server.listen(port, hostname, () => {
  console.log('Server running at http://'+ hostname + ':' + port + '/');
});

eslint setup and configuration

We want to install the Node.js package eslint-config-airbnb-base as a development dependency, but it has some peer dependencies (have to be manually installed along with it). To inspect these dependencies we type:

npm info "eslint-config-airbnb-base@latest" peerDependencies

and see that we also need to install eslint and eslint-plugin-import. We use the following commands to install all three development dependencies.

npm install --save-dev eslint
npm install --save-dev eslint-plugin-import
npm install --save-dev eslint-config-airbnb-base

Additionally, ESLint needs to be configured using an .eslintrs.js file.

module.exports = {
  extends: [
    'airbnb-base',
  ],
  plugins: [
    'import',
  ],
  env: {
    node: true,
  },
};

With all this in place, we can lint our index.js file.

./node_modules/.bin/eslint index.js

• We can simplify running the linter by editing package.json.

...
"scripts": {
  "lint": "eslint index.js",
  "test": "echo \"Error: no test specified\" && exit 1"
},
...

npm run lint

• to remove console warning in slint /* eslint-disable no-console */

List of blog posts for learning:

Build a Node.js API in Under 30 Minutes