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Blogs

Blogs on various topics

CREATE DYNAMIC WEB APPLICATION USING ANGULARJS FRAMEWORK


AngularJS is a JavaScript Framework which benefits us to develop modern age web applications. Today web applications are not restricted to the desktop. They are widely used on the mobile devices. AngularJS is especially useful while building Single Page Applications, Data Driven and CRUD AngularJS is a JavaScript Framework which benefits us to develop modern age web applications. Today web applications are not restricted to the desktop. They are widely used on the mobile devices. AngularJS is especially useful while building Single Page Applications, Data Driven and CRUD


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Node.js Port Scanner


Node.js has become an incredible tool for creating services or utilities that act like a service. Usually it’s npm start, wait a moment, and you’ll see the utility provide an address and port; a good example being localhost:8000. One thing that bugs me about this pattern is if you have many service-based utilities that you work on, you wind up running into “port in use” errors, after which you need to look through all of your utilities to see which one to turn off.There’s an easy solution to this problem: Node Port Scanner. This utility provides methods for finding in use or available ports on a given host! Using Port Scanner The most common use case to solve port collisions would be findAPortNotInUse: var portscanner = require(‘portscanner’); // 127.0.0.1 is the default hostname; not required to provide portscanner.findAPortNotInUse([3000, 3010], ‘127.0.0.1’).then(port => { console.log(`Port ${port} is available!`); // Now start your service on this port… }); Providing a series of ports and then starting on the first available port is made simple — no more collisions. You can also check for a given port’s status, or check for ports in use: // Get port status portscanner.checkPortStatus(3000, ‘127.0.0.1’).then(status => { // Status is ‘open’ if currently in use or ‘closed’ if available console.log(status); }); // Find port in use portscanner.findAPortInUse([3000, 3005, 3006], ‘127.0.0.1’).then(port => { console.log(‘PORT IN USE AT: ‘ + port); }); Using this port scanner utility is incredibly simple and the easiest way to get your service to run on any available port. Hardcoded port usage, when unnecessary, only leads to frustration!


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