How to Migrate from Firebase to Supabase: A Step-by-Step Guide

,Firebase built a generation of developers. But if you,ve hit its walls—expensive queries,vendor lock-in,or SQL envy—Supabase might be your next home. The good news? Migrating doesn,t require a complete rewrite. The better news? You can do it gradually,testing each layer before going live.,This guide covers exactly how to move your data,auth,and functions from Firebase to Supabase without breaking production.,## Why Teams Actually Switch,Firebase is fine. But,fine,stops being fine when:,0,Query costs explode. Firestore charges per read,even if you fetch 1 field from a 100-field document. A poorly written query can rack up 6-figure bills.,0,SQL is better for your schema. Relational data feels unnatural in a NoSQL store. Joins in Firestore require app-side assembly or denormalization.,0,You want control. Firebase is a black box. Supabase gives you PostgreSQL—battle-tested,auditable,migratable.,0,Lock-in anxiety grows. Supabase data lives in standard PostgreSQL. You can self-host,switch providers,or export at will.,Cost savings are real too: one team we talked to reduced database spend from $4k,/month to $600/,month.,## Pre-Migration Checklist (Do This First),Before touching code:,1,Audit your Firebase schema. Export your Firestore data and map it to relational tables. Nested subcollections? You,ll need to denormalize.,2,Size your data. How much Firestore data,Storage files,Auth users? This determines your migration window.,3,Test in staging. Supabase,s free tier is generous. Spin up a staging environment and run migrations there first.,4,Plan your cutover window. Most teams migrate on a weekend or quiet period. 5GB of data? Plan 2-4 hours downtime.,Timeline estimate: Planning phase = 2-3 days. Actual migration = 1-4 hours depending on scale.,## Step 1: Export Firebase Data,Start here. You need your data out of Firestore.,### Firestore Export,Use Firebase,s built-in export tool: