Supabase Debugging & Troubleshooting Hub
Every post here starts with a specific error message or broken behavior and ends with a working fix. No abstract theory — just the root cause and the change that resolves it.
RLS & security
7 itemsSupabase RLS Policy Design Patterns Beyond the Basics
Master advanced Supabase RLS policy patterns for multi-role access, team permissions, and hierarchical authorization.
Next.js + Supabase Security Best Practices (2026)
Next.js + Supabase security essentials: enable RLS on every table, keep service_role server-side, validate JWTs, rate-limit endpoints. Full checklist.
Debugging Supabase RLS Policies: A Simple Checklist
Supabase RLS troubleshooting checklist: verify RLS is enabled, a policy exists per operation, and the right role runs the query. Real SQL at every step.
Supabase RLS Policies Silently Failing: How to Debug Them
Supabase RLS failures return empty data, not errors. Learn the exact debugging workflow to find silent RLS policy bugs before they hit production.
Fix Supabase RLS Infinite Recursion (Production 2026)
"Infinite recursion detected in policy for relation" — your Supabase RLS policy is querying its own table. — practical, code-backed walkthrough.
Test Supabase RLS Policies Before You Ship
The SQL editor and the service key both bypass RLS, so neither proves your policy works. Here is how to test a policy as anon and as two real users.
Supabase 42501: permission denied for schema auth
Querying auth.users from the API or a policy returns 42501. The auth schema is locked on purpose — here is the security definer pattern that works instead.
Auth & sessions
13 itemsSupabase Authentication & Authorization Patterns
Production Supabase auth: email/password, OAuth, magic links, MFA, RLS policies, and the SSR session pattern that survives Next.js middleware.
Supabase SSR Sessions in Next.js App Router (2026 Guide)
How createServerClient, createBrowserClient and middleware cooperate to refresh the Supabase auth cookie — and why getUser() belongs on the server.
Next.js 15 Middleware: Auth, Rate Limiting & Edge Guide
Next.js 15 middleware patterns: auth, rate limiting, A/B testing, geolocation, bot protection, security headers — full Vercel Edge code.
Supabase Auth Callback Redirect Not Working? Next.js Fix
redirectTo only works when the URL is allowlisted in Supabase Auth settings — otherwise it falls back to Site URL. Next.js callback route included.
Supabase Email Confirmation Not Sending: 5 Fixes (2026)
Supabase's built-in SMTP is rate-limited to a handful of emails per hour and only reaches team members — configure custom SMTP, then check 4 more causes.
Supabase Auth Session Disappears on Refresh? Fix (2026)
AuthSessionMissingError means your Supabase cookies never reach the server. Fix it with createServerClient plus middleware refresh — full Next.js guide.
Supabase AuthSessionMissingError in Middleware: 5 Fixes
AuthSessionMissingError, AuthRetryableFetchError, 406 responses and redirect loops in Next.js middleware — the root cause and exact fix for each one.
Fix AuthSessionMissingError: Auth session missing!
Supabase throws "Auth session missing!" when getUser runs with no session attached. Here is what actually causes it in Next.js and how to fix each case.
Supabase Hangs After onAuthStateChange: The Deadlock
Awaiting a Supabase call inside onAuthStateChange deadlocks the client: the next query anywhere in your app never returns. Here is the cause and the fix.
Better Auth vs Supabase Auth 2026: Honest Verdict
The choice is not features, it is where authorisation lives. If your rules run in Postgres RLS, Better Auth changes your architecture. Here is the call.
Supabase Auth Error Codes: Fixes + TS Cheat Sheet (2026)
Cause and fix for every Supabase Auth error code — invalid_credentials, weak_password, same_password, over_email_send_rate_limit — with a typed handler.
Supabase vs Firebase Authentication: Which is Better
Supabase vs Firebase Authentication compared: features, pricing, performance, developer experience — which backend fits your Next.js app.
Supabase vs Firebase in 2026: The Honest Comparison
Supabase vs Firebase in 2026: pricing, database, auth, real-time, storage, and DX compared so you can pick the right backend.
Queries & performance
4 itemsSupabase Connection Pooling: PgBouncer on Vercel Serverless
Configure Supabase PgBouncer pooling for Vercel serverless — avoid connection exhaustion, choose pool modes, tune for production.
Supabase Postgres Functions & Triggers: Developer Guide
Complete guide to Postgres functions and triggers in Supabase. Learn PL/pgSQL, automated workflows, business logic, and database-level validation patterns.
Why Your Supabase Queries Are Slow (And How to Fix)
Supabase queries taking 2-10 seconds? The real causes — missing indexes, N+1 patterns, unoptimized RLS, connection pooling — with copy-paste fixes.
Enable Supabase Realtime: ALTER PUBLICATION + 7 Fixes
No events? Run ALTER PUBLICATION supabase_realtime ADD TABLE your_table, set REPLICA IDENTITY FULL, then fix the six other gotchas that drop updates.
DB ops
4 itemsZero-Downtime Supabase Migrations: Expand/Contract (2026)
Ship Supabase schema changes while traffic flows: expand/contract steps, lock_timeout settings, batched backfills and RLS-safe rollouts wired into CI.
Next.js Database Migrations with Supabase: 2026 Guide
Run database migrations for a Next.js app with the Supabase CLI: supabase migration new, versioned SQL files, db push, and zero-downtime rollout order.
Supabase Connection Pooling: PgBouncer on Vercel Serverless
Configure Supabase PgBouncer pooling for Vercel serverless — avoid connection exhaustion, choose pool modes, tune for production.
Testing Next.js + Supabase: Unit, Integration, RLS, E2E
Four layers that catch real bugs: Jest units, integration on a Postgres branch, pgTAP for RLS policies, Playwright E2E — plus the CI to run them all.
Other hubs
Next.js + Supabase: The Complete Resource Hub
Everything you need to build production-ready full-stack apps with Next.js 15 and Supabase — authentication, RLS, deployments, performance, and architecture decisions.
n8n Automation: Real Workflows from Real Projects
Practical n8n automation guides built from actual client work — CRM lead capture, client reporting, Zapier migration, silent failure debugging, and self-hosted AI with Ollama.
PostgreSQL in Production: Errors, Auth & Query Patterns
PostgreSQL error messages and query patterns you hit running Postgres in production — whether you connect through psql directly or through Supabase, the underlying database is the same.
TypeScript Type Errors: Fixes for Next.js Developers
The TypeScript compiler errors (TS2322, TS2305, TS7016, TS2564 and friends) you actually hit building Next.js apps, with the fix and the type-system reasoning behind it.