Your own bit.ly for a grand total of $0

Sob story

I have always wanted to have my very own url shortner because of the following reasons:

1. The Link will be easy to remember, for own self and for others
2. Just plain cool. Imagine this, https://{your-name}.ml/{whatever-you-want}

.ml becuase it is free! .tk is also free. If you have some spare cash lying around, you can buy your own
.com or .whaterver domain you like

Okay sob story is done, let's get right down to it and here is final repository

OkkarMin / url-shortner-app

Repository for url-shortner-app post, read the post on http://okkarm.in/blog/your-own-url-shortner or https://dev.to/okkarmin/your-own-bit-ly-for-a-grand-total-of-0-5hmi

Tech Stack

• NextJS + ChakraUI
• Firebase Firestore for data storage
• Vercel for hosting

The Process

1. 'Purchase' domain
2. Set up Firebase
3. Create NextJS app
4. Host app on vercel
5. Add domain to vercel

1. 'Purchase' domain

We are going to obtain free domain from freenom. Head over there, register for an account and
type in your desired domain in the Find a new FREE domain. Really anything you like but best is to keep it short.
I wanted okkar.ml but it was taken, so I got myself okkar.tk instead.

Choose 12 months when asked to select the duration, you can also 'release' the domain free domain back if you happen to
buy yourself a domain. Okay we are done with this step

2. Set up Firebase

You can use any database you are comfortable with. The shape of the data is simple.

{
  "slug": "linkedin",
  "full_url": "http://linkedin.com/in/okarmin/"
}

When user, navigate to https://okkar.tk/linkedin they are going to get redirected to the full url, which is
http://linkedin.com/in/okarmin/. In general, when user visit https://okkar.tk/[slug] we are going to look up for
corresponding full_url and redirect the user to it.

• Go to Firebase console
• Add project, any name you like, I will be using url-shortner-app
• Default for rest of the options

Now it should take about a minute to create the project. Once ready, click on:

• Continue
• Firestore Database on the left
• Create database
• Start in test mode, this article will do a better job than me to discuss about securing Firestore
• Choose location that is nearest to your country, asia-southeast2 for Singapore. See all Cloud Firestore locations here

We have created Firestore, let's now add a document to it, click on:

• Start collection
• urls for Collection ID
• Auto ID for Document ID
• slug, string github then Add field
• full_url, string, {your github link} then Save

Add more document if you want to have more urls and remember to use same datashape of {slug, full_url}

We now need to add new web project and get configuration values from Firebase

• Click on setting icon beside Project Over
• Add app
• Choose web, </> logo
• Give it any nickname you like, I will be using url-shortner-app
• Register
• Firebase should now give you the configurations like below

var firebaseConfig = {
  apiKey: "{ value }",
  authDomain: "{ value }",
  projectId: "{ value }",
  storageBucket: "{ value }",
  messagingSenderId: "{ value }",
  appId: "{ value }",
  measurementId: "{ value }",
};

Keep this tab open, we will be using the config in the next step.

3. Create NextJS app

We will use with-chakra-ui-typescript starter from NextJS.
Also npm install Firebase module to allow us to connect with Firestore.

npx create-next-app --example with-chakra-ui-typescript url-shortner-app
cd url-shortner-app
npm install firebase

You can delete the src/components and pages/index.tsx we will not be using them.

3.1 Page for redirecting to full_url

Create pages/[slug].tsx and put the following code

import { GetServerSideProps } from "next";
import firebase from "firebase/app";
import "firebase/firestore";

const Slug = () => {
  return null;
};

export const getServerSideProps: GetServerSideProps = async (context: any) => {
  const { slug } = context.params;

  const firebaseConfig = {
    apiKey: "{ value }",
    authDomain: "{ value }"
    projectId: "{ value }"
  };

  if (!firebase.apps.length) {
    firebase.initializeApp(firebaseConfig);
  }
  const db = firebase.firestore();

  let result: { slug: string; full_url: string } | undefined;

  const querySnapShot = await db
    .collection("urls")
    .where("slug", "==", slug)
    .get();

  querySnapShot.forEach(
    (doc) => (result = doc.data() as { slug: string; full_url: string })
  );

  return result == undefined
    ? {
        redirect: {
          destination: "/",
          permanent: true,
        },
      }
    : {
        redirect: {
          destination: result.full_url,
          permanent: true,
        },
      };
};

export default Slug;

• We import the required modules and files
• Notice the return null, we don't have to return any UI component as we are will be redirecting the users
• On page visit, getServerSideProps will help us determine whether there is an entry in Firestore that has {slug, full_url} pair or not, if there is, redirect user to full_url, otherwise redirect user to / where 404 error page will be shown
• We are only making use of 3 config options for Firebase, apiKey, authDomain, projectID out of full configuration options that we obatined from step 2.

At this stage, you can npm run dev to test your app locally but for us we are sure that it will work :) so we don't test
and let us directly host on vercel and your folder structure should look like this

url-shortner-app/
┣━━📁 src
┃ ┣━━📁 pages
┃ ┃ ┣━━ [slug].tsx
┃ ┃ ┣━━ _app.tsx
┃ ┃ ┗━━ _document.tsx
┃ ┗━━ theme.tsx
┣━━ .gitignore
┣━━ README.md
┣━━ next-env.d.ts
┣━━ package-lock.json
┣━━ package.json
┗━━ tsconfig.json

4. Host app on vercel

Vercel made it extremely easy to host NextJS apps. After all, Vercel is behind NextJS. Before we can host on vercel, create new
repository on github and push your codes to github.

Now we can:

• Login to Vercel using GitHub
• New Project
• Import the repository that you just created and pushed
• Use default options and Deploy

After it has successfully deployed, we need to link the domain we obtained from freenom with Vercel. Click on:

• Domains, in https://vercel.com/dashboard
• Add
• Select the project that was just deployed and Continue
• Type in your domain, okkar.tk for me and Add

You should see this and take note of Type and Value shown:

We now need to go back to freenom:

• Services -> My Domains -> Manage Domain
• Manage Freenom DNS
• Put the Type and Value you saw from Vercel here
• Save Changes

Give it sometime for the DNS configuration to propagate and after some time you should be able to see Valid Configuration
on Vercel. Vercel magically gave us SSL certificate as well which allows our domain to have https protocol.

That's it! We now have a functioning app that allows you to pass your slug and redirect to full_url, in my case since
I bought domain, https://okkarm.in/linkedin will be redirected to http://linkedin.com/in/okarmin/.

End

Right now we are adding new urls from Firebase console, you could try to extend what we have by adding an authenticated
page that allows you to add new urls from the app itself https://domain.ml/addNewUrl. Since we use with-chakra-ui-typescript starter,
you can now use UI components to quickly build fairly nice looking pages.

You could also add in Firebase analytics to keep track of how many visitors per shortened url. Tons of ways you can add on top
of this project.

With that, we end here for today, for more content like this, please hit the subscribe button and ofcourse smash that notificaiton
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