Michio JP

Michio JP

1556034065

Building a Node.js static file server (files over HTTP) using ES6+

We are going to do a static file server in Node.js. This web server is going to respond with the content of the file in a given path. While we are doing this exercise we are going to cover more about http module. Also, use some utilities from other core modules such as path, urland fs.

  1. HTTP Web Servers

Node’s HTTP module is versatile. You can use it as a client, to grab content from websites or as a server. We are going to use it server files from our file system.

If you are familiar with Ruby or Python or http-server package. It’s the equivalent of this:

Existing HTTP Servers Implementations
# python HTTP server
python -m SimpleHTTPServer 9000

# ruby HTTP server
ruby -run -e httpd . -p 9000

# Node HTTP server (npm install http-server)
http-server . -p 9000

Let’s do our own. It’s not that hard.

2 . Simple HTTP Server

One of the simplest servers that you can create in Node, looks like this:

Simple server.js
const http = require('http');

http.createServer(function (req, res) {
  // server code
  console.log(`${req.method} ${req.url}`);
  res.end('hello world!');
}).listen(9000);

console.log('Server listening on port 9000');

To test it out, save the code in a file called server.js and run:

node server.js

Then open the browser on <a href="http://localhost:9000" target="_blank">http://localhost:9000</a> and you will see the “hello world!” message.

Let’s explain what’s going on in the code. We are using the function http.createServer with a callback. This callback function is going to be called every time a client connects to the server. You can see that it takes two parameters: request and response.

The request contains the client’s information. For instance: requested URL, path, headers, HTTP method, and so forth.

The response object is used to reply to the client. You can set what you want to send back to the client. For instance, data, headers, etc.

Finally, the listening part. It allows you to set the port that you want your server to run on. In this case, we are using 9000.

3. Node.js HTTP static file server with ES6+

Let’s now proceed to do the static web server. We want to parse the URL path and get the file matching that path. For instance, if we get a request like localhost:9000/example/server.js. We want to look for a file in ./example/server.js.

Browsers don’t rely on the extension to render a file. Instead, they use the header Content-type. For instance, if we serve an HTML file with a content type text/plain it will show the HTML code (plain text). But, if you use a content type text/html then it will render the HTML as such.

For now, we can infer the file content type based on the file extension. The content types are represented in MIME formmat. MIME stands for Multipurpose Internet Mail Extensions. You can see the MIME types according to file extentions in the following code:

static_server.js
const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
// you can pass the parameter in the command line. e.g. node static_server.js 3000
const port = process.argv[2] || 9000;

// maps file extention to MIME types
const mimeType = {
  '.ico': 'image/x-icon',
  '.html': 'text/html',
  '.js': 'text/javascript',
  '.json': 'application/json',
  '.css': 'text/css',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.wav': 'audio/wav',
  '.mp3': 'audio/mpeg',
  '.svg': 'image/svg+xml',
  '.pdf': 'application/pdf',
  '.doc': 'application/msword',
  '.eot': 'appliaction/vnd.ms-fontobject',
  '.ttf': 'aplication/font-sfnt'
};

http.createServer(function (req, res) {
  console.log(`${req.method} ${req.url}`);

  // parse URL
  const parsedUrl = url.parse(req.url);

  // extract URL path
  // Avoid https://en.wikipedia.org/wiki/Directory_traversal_attack
  // e.g curl --path-as-is http://localhost:9000/../fileInDanger.txt
  // by limiting the path to current directory only
  const sanitizePath = path.normalize(parsedUrl.pathname).replace(/^(\.\.[\/\\])+/, '');
  let pathname = path.join(__dirname, sanitizePath);

  fs.exists(pathname, function (exist) {
    if(!exist) {
      // if the file is not found, return 404
      res.statusCode = 404;
      res.end(`File ${pathname} not found!`);
      return;
    }

    // if is a directory, then look for index.html
    if (fs.statSync(pathname).isDirectory()) {
      pathname += '/index.html';
    }

    // read file from file system
    fs.readFile(pathname, function(err, data){
      if(err){
        res.statusCode = 500;
        res.end(`Error getting the file: ${err}.`);
      } else {
        // based on the URL path, extract the file extention. e.g. .js, .doc, ...
        const ext = path.parse(pathname).ext;
        // if the file is found, set Content-type and send data
        res.setHeader('Content-type', mimeType[ext] || 'text/plain' );
        res.end(data);
      }
    });
  });


}).listen(parseInt(port));

console.log(`Server listening on port ${port}`);

We are using Node.js core path.parse libraries to get the extensions from the URL path. Similarly, we are using url.parse to break down the request.url into its components. Then, we extract the extension from the file. Finally, we use fs.readFile to get the content from the file system. If any error occurs related to the file path, we return a 404 and otherwise return the file content.

Give it a try with:

Command lines to test the server
# run server
node server.js

# get the javascript file with
curl -i localhost:9000/server.js

# testing with non-existing file
curl -i localhost:9000/invalid-file.doc

For the first one, you will get a 200 OK response, while for the 2nd one you will get a 404 not found error, as expected.

You can also download the code from this repo and try out with the test files:

Testing with different file types
# Get Repository
git clone https://github.com/amejiarosario/meanshop.git
cd meanshop
# Load the specific version
git checkout static-server

# start the server (requires Node 4+)
npm start

# test it in your browser with the following paths:
open http://localhost:9000/
open http://localhost:9000/index.html
open http://localhost:9000/test/meanshop-book.png

4. Summary

In this post, we went through the basics about http module to create a server. We talk about the MIME types and how the help the browser to render properly. Finally, we put all together to accomplish our static file server with Node.js!


#node-js #es6 #javascript

What is GEEK

Buddha Community

Building a Node.js static file server (files over HTTP) using ES6+
Aria Barnes

Aria Barnes

1622719015

Why use Node.js for Web Development? Benefits and Examples of Apps

Front-end web development has been overwhelmed by JavaScript highlights for quite a long time. Google, Facebook, Wikipedia, and most of all online pages use JS for customer side activities. As of late, it additionally made a shift to cross-platform mobile development as a main technology in React Native, Nativescript, Apache Cordova, and other crossover devices. 

Throughout the most recent couple of years, Node.js moved to backend development as well. Designers need to utilize a similar tech stack for the whole web project without learning another language for server-side development. Node.js is a device that adjusts JS usefulness and syntax to the backend. 

What is Node.js? 

Node.js isn’t a language, or library, or system. It’s a runtime situation: commonly JavaScript needs a program to work, however Node.js makes appropriate settings for JS to run outside of the program. It’s based on a JavaScript V8 motor that can run in Chrome, different programs, or independently. 

The extent of V8 is to change JS program situated code into machine code — so JS turns into a broadly useful language and can be perceived by servers. This is one of the advantages of utilizing Node.js in web application development: it expands the usefulness of JavaScript, permitting designers to coordinate the language with APIs, different languages, and outside libraries.

What Are the Advantages of Node.js Web Application Development? 

Of late, organizations have been effectively changing from their backend tech stacks to Node.js. LinkedIn picked Node.js over Ruby on Rails since it took care of expanding responsibility better and decreased the quantity of servers by multiple times. PayPal and Netflix did something comparative, just they had a goal to change their design to microservices. We should investigate the motivations to pick Node.JS for web application development and when we are planning to hire node js developers. 

Amazing Tech Stack for Web Development 

The principal thing that makes Node.js a go-to environment for web development is its JavaScript legacy. It’s the most well known language right now with a great many free devices and a functioning local area. Node.js, because of its association with JS, immediately rose in ubiquity — presently it has in excess of 368 million downloads and a great many free tools in the bundle module. 

Alongside prevalence, Node.js additionally acquired the fundamental JS benefits: 

  • quick execution and information preparing; 
  • exceptionally reusable code; 
  • the code is not difficult to learn, compose, read, and keep up; 
  • tremendous asset library, a huge number of free aides, and a functioning local area. 

In addition, it’s a piece of a well known MEAN tech stack (the blend of MongoDB, Express.js, Angular, and Node.js — four tools that handle all vital parts of web application development). 

Designers Can Utilize JavaScript for the Whole Undertaking 

This is perhaps the most clear advantage of Node.js web application development. JavaScript is an unquestionable requirement for web development. Regardless of whether you construct a multi-page or single-page application, you need to know JS well. On the off chance that you are now OK with JavaScript, learning Node.js won’t be an issue. Grammar, fundamental usefulness, primary standards — every one of these things are comparable. 

In the event that you have JS designers in your group, it will be simpler for them to learn JS-based Node than a totally new dialect. What’s more, the front-end and back-end codebase will be basically the same, simple to peruse, and keep up — in light of the fact that they are both JS-based. 

A Quick Environment for Microservice Development 

There’s another motivation behind why Node.js got famous so rapidly. The environment suits well the idea of microservice development (spilling stone monument usefulness into handfuls or many more modest administrations). 

Microservices need to speak with one another rapidly — and Node.js is probably the quickest device in information handling. Among the fundamental Node.js benefits for programming development are its non-obstructing algorithms.

Node.js measures a few demands all at once without trusting that the first will be concluded. Many microservices can send messages to one another, and they will be gotten and addressed all the while. 

Versatile Web Application Development 

Node.js was worked in view of adaptability — its name really says it. The environment permits numerous hubs to run all the while and speak with one another. Here’s the reason Node.js adaptability is better than other web backend development arrangements. 

Node.js has a module that is liable for load adjusting for each running CPU center. This is one of numerous Node.js module benefits: you can run various hubs all at once, and the environment will naturally adjust the responsibility. 

Node.js permits even apportioning: you can part your application into various situations. You show various forms of the application to different clients, in light of their age, interests, area, language, and so on. This builds personalization and diminishes responsibility. Hub accomplishes this with kid measures — tasks that rapidly speak with one another and share a similar root. 

What’s more, Node’s non-hindering solicitation handling framework adds to fast, letting applications measure a great many solicitations. 

Control Stream Highlights

Numerous designers consider nonconcurrent to be one of the two impediments and benefits of Node.js web application development. In Node, at whatever point the capacity is executed, the code consequently sends a callback. As the quantity of capacities develops, so does the number of callbacks — and you end up in a circumstance known as the callback damnation. 

In any case, Node.js offers an exit plan. You can utilize systems that will plan capacities and sort through callbacks. Systems will associate comparable capacities consequently — so you can track down an essential component via search or in an envelope. At that point, there’s no compelling reason to look through callbacks.

 

Final Words

So, these are some of the top benefits of Nodejs in web application development. This is how Nodejs is contributing a lot to the field of web application development. 

I hope now you are totally aware of the whole process of how Nodejs is really important for your web project. If you are looking to hire a node js development company in India then I would suggest that you take a little consultancy too whenever you call. 

Good Luck!

Original Source

#node.js development company in india #node js development company #hire node js developers #hire node.js developers in india #node.js development services #node.js development

Hire Dedicated Node.js Developers - Hire Node.js Developers

If you look at the backend technology used by today’s most popular apps there is one thing you would find common among them and that is the use of NodeJS Framework. Yes, the NodeJS framework is that effective and successful.

If you wish to have a strong backend for efficient app performance then have NodeJS at the backend.

WebClues Infotech offers different levels of experienced and expert professionals for your app development needs. So hire a dedicated NodeJS developer from WebClues Infotech with your experience requirement and expertise.

So what are you waiting for? Get your app developed with strong performance parameters from WebClues Infotech

For inquiry click here: https://www.webcluesinfotech.com/hire-nodejs-developer/

Book Free Interview: https://bit.ly/3dDShFg

#hire dedicated node.js developers #hire node.js developers #hire top dedicated node.js developers #hire node.js developers in usa & india #hire node js development company #hire the best node.js developers & programmers

Node JS Development Company| Node JS Web Developers-SISGAIN

Top organizations and start-ups hire Node.js developers from SISGAIN for their strategic software development projects in Illinois, USA. On the off chance that you are searching for a first rate innovation to assemble a constant Node.js web application development or a module, Node.js applications are the most appropriate alternative to pick. As Leading Node.js development company, we leverage our profound information on its segments and convey solutions that bring noteworthy business results. For more information email us at hello@sisgain.com

#node.js development services #hire node.js developers #node.js web application development #node.js development company #node js application

Michio JP

Michio JP

1556034065

Building a Node.js static file server (files over HTTP) using ES6+

We are going to do a static file server in Node.js. This web server is going to respond with the content of the file in a given path. While we are doing this exercise we are going to cover more about http module. Also, use some utilities from other core modules such as path, urland fs.

  1. HTTP Web Servers

Node’s HTTP module is versatile. You can use it as a client, to grab content from websites or as a server. We are going to use it server files from our file system.

If you are familiar with Ruby or Python or http-server package. It’s the equivalent of this:

Existing HTTP Servers Implementations
# python HTTP server
python -m SimpleHTTPServer 9000

# ruby HTTP server
ruby -run -e httpd . -p 9000

# Node HTTP server (npm install http-server)
http-server . -p 9000

Let’s do our own. It’s not that hard.

2 . Simple HTTP Server

One of the simplest servers that you can create in Node, looks like this:

Simple server.js
const http = require('http');

http.createServer(function (req, res) {
  // server code
  console.log(`${req.method} ${req.url}`);
  res.end('hello world!');
}).listen(9000);

console.log('Server listening on port 9000');

To test it out, save the code in a file called server.js and run:

node server.js

Then open the browser on <a href="http://localhost:9000" target="_blank">http://localhost:9000</a> and you will see the “hello world!” message.

Let’s explain what’s going on in the code. We are using the function http.createServer with a callback. This callback function is going to be called every time a client connects to the server. You can see that it takes two parameters: request and response.

The request contains the client’s information. For instance: requested URL, path, headers, HTTP method, and so forth.

The response object is used to reply to the client. You can set what you want to send back to the client. For instance, data, headers, etc.

Finally, the listening part. It allows you to set the port that you want your server to run on. In this case, we are using 9000.

3. Node.js HTTP static file server with ES6+

Let’s now proceed to do the static web server. We want to parse the URL path and get the file matching that path. For instance, if we get a request like localhost:9000/example/server.js. We want to look for a file in ./example/server.js.

Browsers don’t rely on the extension to render a file. Instead, they use the header Content-type. For instance, if we serve an HTML file with a content type text/plain it will show the HTML code (plain text). But, if you use a content type text/html then it will render the HTML as such.

For now, we can infer the file content type based on the file extension. The content types are represented in MIME formmat. MIME stands for Multipurpose Internet Mail Extensions. You can see the MIME types according to file extentions in the following code:

static_server.js
const http = require('http');
const url = require('url');
const fs = require('fs');
const path = require('path');
// you can pass the parameter in the command line. e.g. node static_server.js 3000
const port = process.argv[2] || 9000;

// maps file extention to MIME types
const mimeType = {
  '.ico': 'image/x-icon',
  '.html': 'text/html',
  '.js': 'text/javascript',
  '.json': 'application/json',
  '.css': 'text/css',
  '.png': 'image/png',
  '.jpg': 'image/jpeg',
  '.wav': 'audio/wav',
  '.mp3': 'audio/mpeg',
  '.svg': 'image/svg+xml',
  '.pdf': 'application/pdf',
  '.doc': 'application/msword',
  '.eot': 'appliaction/vnd.ms-fontobject',
  '.ttf': 'aplication/font-sfnt'
};

http.createServer(function (req, res) {
  console.log(`${req.method} ${req.url}`);

  // parse URL
  const parsedUrl = url.parse(req.url);

  // extract URL path
  // Avoid https://en.wikipedia.org/wiki/Directory_traversal_attack
  // e.g curl --path-as-is http://localhost:9000/../fileInDanger.txt
  // by limiting the path to current directory only
  const sanitizePath = path.normalize(parsedUrl.pathname).replace(/^(\.\.[\/\\])+/, '');
  let pathname = path.join(__dirname, sanitizePath);

  fs.exists(pathname, function (exist) {
    if(!exist) {
      // if the file is not found, return 404
      res.statusCode = 404;
      res.end(`File ${pathname} not found!`);
      return;
    }

    // if is a directory, then look for index.html
    if (fs.statSync(pathname).isDirectory()) {
      pathname += '/index.html';
    }

    // read file from file system
    fs.readFile(pathname, function(err, data){
      if(err){
        res.statusCode = 500;
        res.end(`Error getting the file: ${err}.`);
      } else {
        // based on the URL path, extract the file extention. e.g. .js, .doc, ...
        const ext = path.parse(pathname).ext;
        // if the file is found, set Content-type and send data
        res.setHeader('Content-type', mimeType[ext] || 'text/plain' );
        res.end(data);
      }
    });
  });


}).listen(parseInt(port));

console.log(`Server listening on port ${port}`);

We are using Node.js core path.parse libraries to get the extensions from the URL path. Similarly, we are using url.parse to break down the request.url into its components. Then, we extract the extension from the file. Finally, we use fs.readFile to get the content from the file system. If any error occurs related to the file path, we return a 404 and otherwise return the file content.

Give it a try with:

Command lines to test the server
# run server
node server.js

# get the javascript file with
curl -i localhost:9000/server.js

# testing with non-existing file
curl -i localhost:9000/invalid-file.doc

For the first one, you will get a 200 OK response, while for the 2nd one you will get a 404 not found error, as expected.

You can also download the code from this repo and try out with the test files:

Testing with different file types
# Get Repository
git clone https://github.com/amejiarosario/meanshop.git
cd meanshop
# Load the specific version
git checkout static-server

# start the server (requires Node 4+)
npm start

# test it in your browser with the following paths:
open http://localhost:9000/
open http://localhost:9000/index.html
open http://localhost:9000/test/meanshop-book.png

4. Summary

In this post, we went through the basics about http module to create a server. We talk about the MIME types and how the help the browser to render properly. Finally, we put all together to accomplish our static file server with Node.js!


#node-js #es6 #javascript

sophia tondon

sophia tondon

1625114985

Top 10 NodeJs app Development Companies- ValueCoders

Node.js is a prominent tech trend in the space of web and mobile application development. It has been proven very efficient and useful for a variety of application development. Thus, all business owners are eager to leverage this technology for creating their applications.

Are you striving to develop an application using Node.js? But can’t decide which company to hire for NodeJS app development? Well! Don’t stress over it, as the following list of NodeJS app development companies is going to help you find the best partner.

Let’s take a glance at top NodeJS application development companies to hire developers in 2021 for developing a mind-blowing application solution.

Before enlisting companies, I would like to say that every company has a foundation on which they thrive. Their end goals, qualities, and excellence define their competence. Thus, I prepared this list by considering a number of aspects. While making this list, I have considered the following aspects:

  • Review and rating
  • Enlisted by software peer & forums
  • Hourly price
  • Offered services
  • Year of experience (Average 8+ years)
  • Credibility & Excellence
  • Served clients and more

I believe this list will help you out in choosing the best NodeJS service provider company. So, now let’s explore the top NodeJS developer companies to choose from in 2021.

#1. JSGuru

JSGuru is a top-rated NodeJS app development company with an innovative team of dedicated NodeJS developers engaged in catering best-class UI/UX design, software products, and AWS professional services.

It is a team of one of the most talented developers to hire for all types of innovative solution development, including social media, dating, enterprise, and business-oriented solutions. The company has worked for years with a number of startups and launched a variety of products by collaborating with big-name corporations like T-systems.

If you want to hire NodeJS developers to secure an outstanding application, I would definitely suggest them. They serve in the area of eLearning, FinTech, eCommerce, Telecommunications, Mobile Device Management, and more.

  • Ratings: 4.9/5.0

  • Founded: 2006

  • Headquarters: Banja Luka, Bosnia, and Herzegovina

  • Price: Starting from $50/hour

Visit Website - https://www.valuecoders.com/blog/technology-and-apps/top-node-js-app-development-companies

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