Tutorials on Web Development, Programming, and Web Design

spread operator in Javascript ES6

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The spread operator in Javascript ES6 uses three dots … It also returns 15 to the browser.   Except that the dot-dot-dot is in the caller and not in the function definition.  The function...

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Rest parameter in ES6

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In this ES6 example, we define function “adder” with a “rest parameter” called “numbers”.  Note the three dots before the parameter name in the function...

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Default function parameters in ES6

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Here is an example of using default function parameters in ES6: You see that the browser displays “Hello John” because we passed in the value “John” into the sayHello...

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Example of Get and Post in Express

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In this tutorial, we will create a form which user post their meal preferences to another page so that we can see how to implement Express’s get and post routing methods. GET We start off with...

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Using Mustache Templating engine with Express

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To use the Mustache templating engine in Express, you first install the mustache-express package … npm install mustache-express –save and then add the require module… This sets up...

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Displaying static files in Express

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If you want the webapp in the last tutorial to display a static image, it would give a 404 error.  To fix this, use the express.static middleware like this … That means that anything placed...

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Creating Custom 404 error pages in Express

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To create a custom 404 page indicating “page-not-found” in Express, we add the following to our existing code in previous tutorial… Now when you go to an unknown page URL, you get...

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Putting Node Express app on Heroku

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In the last tutorial, we created an simple Hello WorldNode Express app which we will not deploy to Heroku for hosting on the public internet. Step 1: Login to your Heroku hosting account and click...

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Tutorial for Hello World in Node Express step-by-step

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In this tutorial, we write a Hello World program in Node.js with ExpressJS.  It assumes that you have already installed Node and are able to run npm. If you’ve installed it long time ago and...

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