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Home / Migrations / Mongoose (MongoDB) → Drizzle ORM (PostgreSQL)

Mongoose (MongoDB) → Drizzle ORM (PostgreSQL)

hard

Move from MongoDB/Mongoose document model to relational PostgreSQL with Drizzle. Involves rethinking data structure, not just swapping libraries.

Estimated: 12-24h · 7 steps

Progress0%

Step 1: Analyze current schema

List all Mongoose schemas. Identify embedded documents (→ related tables), arrays (→ junction tables), mixed types (→ JSONB columns).

Step 2: Design SQL schema

Create Drizzle schema file. Embedded docs → separate tables with FK. Arrays of primitives → separate table or JSONB. Mixed → JSONB.

npm install drizzle-orm postgres && npm install -D drizzle-kit

Step 3: Export MongoDB data

Use mongoexport to export collections as JSON.

mongoexport --db mydb --collection users --out users.json

Step 4: Transform and import data

Write a Node.js script to read exported JSON and insert into PostgreSQL using Drizzle. Handle nested objects and arrays.

Step 5: Replace Mongoose queries

Model.find(filter) → db.select().from(table).where(). Model.create() → db.insert(). Model.updateOne() → db.update().

Step 6: Update indexes

Recreate Mongoose indexes as PostgreSQL indexes in Drizzle schema. Unique constraints, compound indexes.

Step 7: Test thoroughly

✓ All CRUD operations work, relationships correct, performance acceptable

What this migration involves

Moving from Mongoose (MongoDB) to Drizzle ORM (PostgreSQL) is rated hard and takes about 12-24h on a typical project. The guide breaks it into 7 steps, 2 of which ship with runnable commands and 1 with a verification check.

Related migrations

Mongoose (MongoDB) → Prisma + MongoDB — medium, 6-14h Prisma + PlanetScale → Drizzle ORM + Neon — medium, 6-12h

FAQ

How long does migrating from Mongoose (MongoDB) to Drizzle ORM (PostgreSQL) take?

Around 12-24h for a typical project — 7 steps, difficulty rated hard, 2 of them with copy-paste commands.

Is moving from Mongoose (MongoDB) to Drizzle ORM (PostgreSQL) reversible?

No reverse guide is tracked yet, so treat this as a one-way move and keep a full export of your Mongoose (MongoDB) data before you start.

What does Drizzle ORM (PostgreSQL) cost compared to Mongoose (MongoDB)?

Pricing for both tools is contact-based or not tracked yet.