5 Surprising Mistakes You’re Making with Supabase (And How to Fix Them)

Supabase is a powerful tool for indie hackers and solo founders looking to build applications quickly, but it's easy to trip up along the way. As someone who's been using Supabase for various side projects, I've bumped into a few common pitfalls that can lead to headaches down the line. In 2026, let’s address these surprising mistakes and how to fix them.

Mistake 1: Ignoring Database Security Settings

What Happens

Many developers dive straight into building their applications without properly configuring database security settings. This can lead to unauthorized access and data leaks.

How to Fix It

Take a moment to review Supabase's Row Level Security (RLS). Here’s how you can implement it:

1. Enable RLS: In the Supabase dashboard, go to the "Authentication" section and enable RLS for your tables.
2. Define Policies: Create policies that specify who can view or modify data. Use SQL statements to set these rules.

Expected Output

When RLS is properly configured, users should only see data they have permission to access.

Mistake 2: Overlooking Performance Optimization

What Happens

Using Supabase without considering performance can lead to slow applications, especially as your user base grows.

How to Fix It

1. Use Indexed Columns: Identify frequently queried columns and create indexes on them.
2. Optimize Queries: Use Supabase's built-in query editor to analyze and refine your SQL queries.

Expected Output

You should see a significant reduction in query times, especially for larger datasets.

Mistake 3: Not Using Supabase Functions

What Happens

Many developers overlook Supabase's serverless functions, which can simplify backend logic and improve maintainability.

How to Fix It

1. Create a New Function: In the Supabase dashboard, navigate to "Functions" and create a new function for your specific logic.
2. Use HTTP Endpoints: Call these functions from your frontend to handle complex operations.

Expected Output

Your application will be more modular, and you’ll reduce redundancy in your codebase.

Mistake 4: Mismanaging API Keys

What Happens

Hardcoding API keys in your frontend code can expose them to anyone inspecting your app, leading to unauthorized access.

How to Fix It

1. Environment Variables: Store sensitive keys in environment variables instead of hardcoding them.
2. Use Supabase’s Auth: Leverage Supabase’s authentication system to manage user sessions securely.

Expected Output

Your API keys will be safe, and user sessions will be more secure.

Mistake 5: Not Leveraging Client Libraries

What Happens

Some developers stick to raw SQL queries and miss out on the benefits of Supabase’s client libraries that can streamline development.

How to Fix It

1. Install the Supabase JS Library: Use npm or yarn to install the Supabase client library.
2. Utilize Built-in Methods: Use methods like from(), select(), and insert() for cleaner code.

Expected Output

Your codebase will be cleaner and easier to maintain, and you'll benefit from built-in error handling and functionality.

Conclusion: Start Here

If you're just starting with Supabase or facing issues, focus on these five areas. Prioritize security, performance, and using the right tools within Supabase. For further insights, consider tuning into our podcast, Built This Week, where we share our experiences and tools for indie builders.

What We Actually Use

In our stack, we rely heavily on Supabase's authentication, RLS, and client libraries. We’ve found that these elements help us avoid common pitfalls and streamline our development process.