Initializing Supabase client - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of initializing a Supabase client?

Initializing a Supabase client connects your application to the Supabase backend services, allowing you to interact with the database, authentication, and storage.

beginner

Which two pieces of information are required to initialize a Supabase client?

You need the Supabase URL (endpoint) and the public API key (anon key) to initialize the client.

beginner

Show the basic JavaScript code snippet to initialize a Supabase client.

import { createClient } from '@supabase/supabase-js';
const supabaseUrl = 'https://xyzcompany.supabase.co';
const supabaseKey = 'public-anonymous-key';
const supabase = createClient(supabaseUrl, supabaseKey);

intermediate

Why should you keep the Supabase service key secret and not expose it in client-side code?

The service key has elevated permissions and can modify or delete data. Exposing it publicly risks unauthorized access and data breaches.

beginner

What happens if you initialize the Supabase client with incorrect URL or key?

The client will fail to connect properly, causing errors when trying to access database or services, usually resulting in authentication or network errors.

What function is used to create a Supabase client in JavaScript?

A initSupabase

B createClient

C startClient

D connectSupabase

The official Supabase JavaScript library uses the createClient function to initialize the client.

Which of these is NOT required to initialize a Supabase client?

A Database password

B Supabase URL

C API key

D None of the above

You only need the Supabase URL and API key; the database password is managed internally by Supabase.

Where should you store your Supabase anon key for client-side apps?

A In a database table

B Only in server-side environment variables

C In a public GitHub repo

D In environment variables or directly in client code

The anon key is safe for client-side use and can be stored in environment variables or directly in client code.

What is the main risk of exposing the Supabase service key in client code?

A Increased storage costs

B Slower app performance

C Unauthorized data access and modification

D No risk at all

The service key grants full access, so exposing it risks unauthorized data changes.

If your Supabase client initialization fails, what is a common cause?

A Incorrect URL or API key

B Too many users logged in

C Browser cache issues

D Missing CSS files

Incorrect URL or API key prevents the client from connecting to Supabase services.

Explain how to initialize a Supabase client and why each part is important.

Think about what your app needs to talk to Supabase.

Describe the security considerations when initializing a Supabase client in a web app.

Consider what keys can do and where they should be kept.