Using Scoped Slots in Vue.js to Abstract Functionality

Let’s start with a short introduction to Vue.js slots concept. Slots are useful when you want to inject content in a specific place of a component. Those specific places that you can define are called slots.
For example, you want to create a wrapper component that is styled in a specific way but you want to be able to pass any content to be rendered inside that wrapper (it might be a string, a computed value, or even another …
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How to Deploy Your Secure Vue.js App to AWS

This article was originally published on the Okta developer blog. Thank you for supporting the partners who make SitePoint possible.
Writing a Vue app is intuitive, straightforward, and fast. With low barriers to entry, a component-based approach, and built-in features like hot reloading and webpack, Vue allows you to focus on developing your application rather than worrying about your dev environment and build processes. But, what happens when you are ready to deploy your app into production? The choices can be endless and sometimes unintuitive.
As an AWS Certified Solutions Architect, I am frequently asked how to deploy Vue apps to AWS. In this tutorial, I will walk you through building a small, secure Vue app and deploying it to Amazon Web Services (AWS). If you’ve never used AWS, don’t worry! I’ll walk you through each step of the way starting with creating an AWS account.
About AWS
Amazon Web Services (AWS) is a cloud platform that provides numerous on-demand cloud services. These services include cloud computing, file storage, relational databases, a content distribution network, and many, many more. AWS came into existence not as a retail offering, but rather Amazon’s internal answer to the growing complexity of the infrastructure that was responsible for powering Amazon.com and their e-commerce operations. Amazon quickly realized their cloud-based infrastructure was a compelling, cost-effective solution and opened it to the public in 2006.
At the time of writing this article, AWS is worth an estimated $250B (yes, that’s a B for BILLION) and used by thousands of companies and developers worldwide.

What You Will Build
I feel the best way to learn is by doing. I’ll walk you through building a small, Vue app with an Express REST server. You will secure your app using Okta’s OpenID Connect (OIDC) which enables user authentication and authorization with just a few lines of code.
You will begin by building the Vue frontend and deploy it to Amazon S3. Then you will leverage Amazon CloudFront to distribute your Vue frontend to edge servers all around the world. Lastly, you will create an Express API server and deploy it with Serverless. This API server will contain a method to fetch “secure data” (just some dummy data) which requires a valid access token from the client to retrieve.
The goal of this article is to show you how to leverage multiple AWS services rather than just spinning up a single EC2 instance to serve your app. With this services-based approach, you have a limitless scale, zero maintenance, and a cost-effective way to deploy apps in the cloud.
What is Okta?
Okta is a cloud service that allows developers to manage user authentication and connect them with one or multiple applications. The Okta API enables you to:

Authenticate and authorize your users
Store data about your users
Perform password-based and social login
Secure your application with multi-factor authentication
And much more! Check out our product documentation

Register for a free developer account, and when you’re done, come on back so we can learn more deploying a Vue app to AWS.
Bootstrap Frontend
You are going to build the Vue frontend to your secure app first and deploy it to Amazon S3 and Amazon CloudFront. Amazon S3 (Simple Storage Service) is a highly redundant, object-based file store that is both powerful and featureful. In the scope of this article, we will focus on one of the best features S3 provides: Static website hosting.
To get started quickly, you can use the scaffolding functionality from vue-cli to get your app up and running quickly. For this article, you can use the webpack template that includes hot reloading, CSS extraction, linting, and integrated build tools.
To install vue-cli run:
npm install -g vue-cli@2.9.6

Next up is to initialize your project. When you run the following vue init command, accept all the default values.
vue init webpack secure-app-client
cd ./secure-app-client
npm run dev

The init method should also install your app’s dependencies. If for some reason it doesn’t, you can install them via npm install. Finally, open your favorite browser and navigate to http://localhost:8080. You should see the frontend come alive!

About Single Page Applications
When you create an application with Vue, you are developing a Single Page Application (or “SPA”). SPAs have numerous advantages over traditional multi-page, server-rendered apps. It’s important to understand the difference between SPAs and multi-page web applications — especially when it comes to deploying.
A SPA app is often referred as a “static app” or “static website.” Static, in this context, means that your application compiles all its code to static assets (HTML, JS, and CSS). With these static assets, there is no specialized web server required to serve the application to your users.
Traditional web applications require a specialized web server to render every request to a client. For each of these requests, the entire payload of a page (including static assets) is transferred.
Conversely, within an SPA there is only an initial request for the static files, and then JavaScript dynamically rewrites the current page. As your users are navigating your app, requests to subsequent pages are resolved locally and don’t require an HTTP call to a server.

Vue-router and Creating Additional Routes
The component of an SPA that is required to rewrite the current page dynamically is commonly referred to as a “router”. The router programmatically calculates which parts of the page should mutate based off the path in the URL.
Vue has an official router that is aptly named vue-router. Since you used the vue-cli bootstrap, your app has this dependency and a router file defined (./src/router/index.js). Before we can define additional routes, we need to create the pages (or components) that you want the router to render. Create the following files in your project:
Homepage: ./src/components/home.vue