Building a Full-Stack Application with Next.js and Supabase

What is Supabase?

Supabase is an open-source Firebase alternative that provides a PostgreSQL database, real-time subscriptions, and object storage. It is a serverless platform that allows you to manage your database from the Supabase interface, ranging from creating tables and relationships to writing SQL queries and real-time engine on top of PostgreSQL.

Setting up a Supabase Project

To set up a Supabase project, follow these steps:

1. Visit the Supabase website and sign in to the app dashboard using your GitHub account.
2. Once you log in, create a new organization and set up a new project within it by clicking on “All Projects” and then “New Project”.
3. Give your project a name and database password, and click on “Create a new project”.

Creating a Database Table

Once the project has been created, you can create a database table by following these steps:

1. 1. Click on the SQL Editor icon on the dashboard and click on “New Query”.
   2. Enter the SQL query to create a table, for example:

CREATE TABLE users (
    id SERIAL PRIMARY KEY,
    name VARCHAR(50),
    email VARCHAR(100) UNIQUE
);

1. Click on “RUN” to execute the query. This will create a table in your database that you can use to store data.

Connecting Next.js with Supabase

To connect Next.js with Supabase, follow these steps:

1. 1. Install the Supabase client package by running the command:

npm install @supabase/supabase-js

1. 1. Import the Supabase client in your Next.js project:

import { createClient } from '@supabase/supabase-js';

1. 1. Set up environment variables to store your Supabase URL and anonymous key:

const supabaseUrl = process.env.SUPABASE_URL;
const supabaseAnonKey = process.env.SUPABASE_ANON_KEY;

1. 1. Create a Supabase client instance:

const supabase = createClient(supabaseUrl, supabaseAnonKey);

Implementing Authentication

To implement authentication, you can use the Supabase auth functionality to create users and authenticate them. Here’s an example:

import { supabase } from '../supabase';

async function signUp(email, password) {
  const { user, error } = await supabase.auth.signUp({
    email,
    password,
  });
  if (error) {
    throw error;
  }
  return user;
}

async function signIn(email, password) {
  const { user, error } = await supabase.auth.signIn({
    email,
    password,
  });
  if (error) {
    throw error;
  }
  return user;
}

async function getSession() {
  const { data: session, error } = await supabase.auth.getSession();
  if (error) {
    throw error;
  }
  return session;
}

Implementing Functionalities

Once you have implemented authentication, you can start implementing functionalities such as creating, reading, updating, and deleting data in your database using the Supabase client. Here’s an example:

import { supabase } from '../supabase';

async function createUser(name, email) {
  const { data, error } = await supabase
   .from('users')
   .insert({ name, email });
  if (error) {
    throw error;
  }
  return data;
}

async function getUser(id) {
  const { data, error } = await supabase
   .from('users')
   .select('name, email')
   .eq('id', id);
  if (error) {
    throw error;
  }
  return data;
}

You can use the Supabase client to interact with your database and perform CRUD operations.