JavaScript client installation in Supabase - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to import the Supabase client library.

Supabase

import { createClient } from '[1]';

Drag options to blanks, or click blank then click option'

Asupabase-client

B@supabase/supabase-js

Csupabase

Dsupabase-lib

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect package names like 'supabase-client' or 'supabase-lib'.

Forgetting to import the client before using it.

The official Supabase JavaScript client library is imported from the '@supabase/supabase-js' package.

2fill in blank

medium

Complete the code to create a Supabase client instance with your project URL.

Supabase

const supabase = createClient('[1]', 'your-anon-key');

Drag options to blanks, or click blank then click option'

Aproject-url

Bsupabase-url

Cyour-project-url

DsupabaseProjectUrl

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong variable name or placeholder.

Confusing the URL with the anon key.

The first argument to createClient is your Supabase project URL, which you get from your Supabase dashboard.

3fill in blank

hard

Fix the error in the code to correctly create the Supabase client.

Supabase

const supabase = createClient('your-project-url', [1]);

Drag options to blanks, or click blank then click option'

A'your-anon-key'

B'anon-key'

CanonKey

Danon_key

Attempts:

3 left

💡 Hint

Common Mistakes

Passing the anon key without quotes causing a syntax error.

Using incorrect variable names.

The second argument must be a string containing your anon key, so it needs quotes around it.

4fill in blank

hard

Fill both blanks to initialize the Supabase client with environment variables.

Supabase

const supabase = createClient(process.env.[1], process.env.[2]);

Drag options to blanks, or click blank then click option'

ASUPABASE_URL

BSUPABASE_KEY

CSUPABASE_ANON_KEY

DSUPABASE_SECRET

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong environment variable names.

Mixing up anon key and secret key.

Use SUPABASE_URL for the project URL and SUPABASE_ANON_KEY for the anon key from environment variables.

5fill in blank

hard

Fill all three blanks to import, create, and export the Supabase client.

Supabase

import { [1] } from '@supabase/supabase-js';

const supabase = [2]('[3]', process.env.SUPABASE_ANON_KEY);

export default supabase;

Drag options to blanks, or click blank then click option'

AcreateClient

BcreateClient()

Cyour-project-url

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses in the import statement.

Passing environment variable instead of string for URL in this example.

Import createClient, call it to create the client with your project URL, then export the client.

Practice

1. What is the correct command to install the Supabase JavaScript client using npm?

easy

A. npm install @supabase/supabase-js

B. npm install supabase-js

C. npm install supabase-client

D. npm install @supabase/client-js

Solution

1. Step 1: Identify the official package name

   The official Supabase JavaScript client package is named '@supabase/supabase-js'.

2. Step 2: Use npm install with the correct package

   The correct command is 'npm install @supabase/supabase-js' to install the client.

3. Final Answer:

   npm install @supabase/supabase-js -> Option A

4. Quick Check:

   Correct package name = npm install @supabase/supabase-js [OK]

Hint: Remember the package starts with '@supabase/' [OK]

Common Mistakes:

• Using incomplete package names
• Omitting the '@supabase/' prefix
• Confusing with other similar package names

2. Which of the following is the correct way to import the Supabase client in a JavaScript file after installation?

easy

A. const supabase = require('supabase-js');

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

C. import supabase from '@supabase/client';

D. const supabase = require('@supabase/supabase-js');

Solution

1. Step 1: Use ES module import syntax

   The Supabase client uses named export 'createClient' from '@supabase/supabase-js'.

2. Step 2: Confirm correct import statement

   The correct import is 'import { createClient } from '@supabase/supabase-js';'.

3. Final Answer:

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

4. Quick Check:

   Use named import 'createClient' from '@supabase/supabase-js' [OK]

Hint: Use named import with curly braces for createClient [OK]

Common Mistakes:

• Using default import instead of named import
• Using wrong package name in import
• Mixing require and import syntax

3. Given the following code snippet, what will be the output of console.log(supabaseUrl)?

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

medium

A. https://xyzcompany.supabase.co

B. undefined

C. An error because supabaseUrl is not defined

D. 'public-anonymous-key'

Solution

1. Step 1: Identify the variable logged

   The code logs 'supabaseUrl', which is defined as a string URL.

2. Step 2: Confirm the value of supabaseUrl

   It is set to 'https://xyzcompany.supabase.co', so logging it prints this string.

3. Final Answer:

   https://xyzcompany.supabase.co -> Option A

4. Quick Check:

   Variable supabaseUrl = 'https://xyzcompany.supabase.co' [OK]

Hint: Check which variable is logged exactly [OK]

Common Mistakes:

• Confusing supabaseUrl with supabaseKey
• Assuming logging supabase object instead
• Thinking variable is undefined

4. What is wrong with this code snippet for creating a Supabase client?

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

medium

A. The supabaseUrl is missing the protocol

B. The import statement is incorrect

C. The supabaseKey should be an environment variable

D. The arguments to createClient are reversed; URL should be first

Solution

1. Step 1: Check the order of arguments in createClient

   The function expects the URL first, then the key.

2. Step 2: Identify the mistake in argument order

   The code passes the key first and URL second, which is incorrect.

3. Final Answer:

   The arguments to createClient are reversed; URL should be first -> Option D

4. Quick Check:

   createClient(url, key) order matters [OK]

Hint: Remember: URL first, key second in createClient() [OK]

Common Mistakes:

• Swapping URL and key arguments
• Ignoring import correctness
• Not using environment variables (though recommended)

5. You want to keep your Supabase key secure in a JavaScript project. Which is the best practice to handle the key?

hard

A. Publish the key in your public GitHub repository for easy access

B. Hardcode the key directly in your JavaScript files

C. Store the key in an environment variable and access it in your code

D. Send the key as a query parameter in URLs

Solution

1. Step 1: Understand security best practices for keys

   Keys should not be exposed in code or public places to avoid misuse.

2. Step 2: Use environment variables to keep keys secure

   Environment variables keep keys out of code and can be managed securely.

3. Final Answer:

   Store the key in an environment variable and access it in your code -> Option C

4. Quick Check:

   Use environment variables for secrets [OK]

Hint: Never hardcode keys; use environment variables [OK]

Common Mistakes:

• Hardcoding keys in source code
• Exposing keys publicly in repos
• Passing keys in URLs