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Now, we have a file writing function writeFileSync in fs module as shown below −const requestBody = []; req.on('data', (chunks)=>{ requestBody.push(chunks); }); return req.on('end', ()=>{ const parsedData = Buffer.concat(requestBody).toString(); const username = parsedData.split('=')[1]; fs.writeFileSync('username.txt', username); //redirect res.statusCode=302; res.setHeader('Location', '/'); return res.end(); });Sync means synchronized. It’s a blocking code example. Once file write is completed then only code execution for rest of the file starts. Above code is simpler but if we have a large file handling operation it will result into slow performance of app.This way of code execution will slow down the ... Read More
In earlier example in App.js , we saw how to parse data from request using data and end event.Code snippet below shows the if block for that −if(url === '/username' && req.method === 'POST'){ const requestBody = []; req.on('data', (chunks)=>{ requestBody.push(chunks); }); req.on('end', ()=>{ const parsedData = Buffer.concat(requestBody).toString(); const username = parsedData.split('=')[1]; fs.writeFileSync('username.txt', username); }); //redirect res.statusCode=302; res.setHeader('Location', '/'); return res.end(); }In above code block, we have two events (data and end) registered if path matches to ‘/username’ and ... Read More
Earlier in simple code example, we saw how to route a request and creating a file to input the test data.Now, we want to save the user entered input data into text file.How Node.js handles incoming request dataNode.js reads data in chunks means it uses streams to read data . Once node completes reading request data, we can proceed to use it for our purpose.First read data in chunks const requestBody = []; req.on(‘data’, (chunks)=>{ requestBody.push(chunks); });We have registred an event called ‘data’ on incoming http request. This event will keep on streaming data and pushes to requestBody const ... Read More
Now we have an App.js file shown below, we want to redirect the user back to ‘/’ once user name is received by node server. We will store user name in a file named username.txtInitial App.js file −const http = require('http'); const server = http.createServer((req, res)=>{ const url = req.url; if(url === '/'){ res.write(''); res.write(' Hello TutorialsPoint '); res.write(' Submit '); res.write(''); return res.end(); } res.write(''); res.write(' Hello TutorialsPoint '); ... Read More
Routing http requests is important because we want to execute different business rules based on request url and the responses will be different for each routes.Earlier we saw, we can get the url by request.url in node. Simple example of user name input with routes is shown below −const http = require('http'); const server = http.createServer((req, res)=>{ const url = req.url; if(url === '/'){ res.write(''); res.write(' Hello TutorialsPoint '); res.write(' Submit '); res.write(''); ... Read More
App.js −const http = require('http'); const server = http.createServer((req, res)=>{ console.log(req.url, req.method, req. headers); }); server.listen(3000);As shown in above example code, we have request and response parameter object as an argument in createServer method.Response (res) object will be used to send back data to client. It has many properties, some are explained below −res.setHeader(‘Content-Type’, ‘text/html’); this line will set the format of response content o text/html.How to send html content from node.jswrite() function method on response object can be used to send multiple lines of html code like below.res.write(‘’); res.write(‘ Hello TutorialsPoint ’); res.write(‘ Hello Tutorials ... Read More
App.jsconst http = require('http'); const server = http.createServer((req, res)=>{ console.log(req); }); server.listen(3000);Run it with command: node App.jsWe can see what is inside a request object by opening a browser and navigating to localhost:3000There is lots of information which will get printed on console window. We will see some important properties.Identifying the url from where request came, request method type and headers in request is important.Headers will give us information on host and browser type , accepted response by host etc. Request method can be of any http method type like GET, POST, PUT, DELETE etc.const http = require('http'); const ... Read More
Simple http server in node.js will register an event loop which will keep on listening for http requests.Execution of file containing code for creation of server will work as shown below −node App.js => Start executing script => Code parsing, Register events and functions => event loop=> keeps on running as long as event are registered.This is the single threaded event driven approach of the node.js. For accessing and updating of values in database also works using the event driven approach. Even though it’s a single threaded, it can handle multiple requests at a time due to its speed of ... Read More
The mostly used core modules of Node.js are −http − used to launch a simple server, send requestshttps − used to launch a ssl secured http serverpath − used to handle path based on operating systemfs − It’s a file system handling moduleos − its used for os related operationsLets build a simple http server using Node.js −Create a javascript file App.js (name it as you like) in an editor like visual studio code .App.jsconst http = require(‘http’); function reqListener(req, res){ console.log(‘Hello’); } const server = http.createServer(reqListener); server.listen(3000);ExplainationWe used const keyword instead of var or let to import a ... Read More
To display an image inside SVG circle, use the element and set the clipping path. The element is used to define a clipping path. Image in SVG is set using the element.ExampleYou can try to run the following code to learn how to display an image inside SVG circle in HTML5Live Demo HTML5 SVG Image