MikroORM
TypeScript ORM with Unit of Work pattern, identity map, and decorator-based entity mapping for PostgreSQL, MySQL, SQLite, and MongoDB.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
Parameterized queries used by default preventing SQL injection. Connection string should be managed via environment variables.
⚡ Reliability
Best When
Best for TypeScript projects wanting the Unit of Work pattern, identity map, and strong typing without Prisma's schema-first approach.
Avoid When
Avoid for JavaScript-only projects or when Prisma's introspection-based workflow from an existing schema is preferred.
Use Cases
- • Build type-safe database layers for TypeScript agent backends with automatic change tracking
- • Use the Unit of Work pattern to batch multiple database operations into a single transaction
- • Leverage EntityManager's identity map to avoid redundant database reads within a request scope
- • Implement schema migrations using MikroORM's migration CLI with up/down scripts
- • Use the Query Builder for complex joins while keeping type safety with MikroORM's TypeScript integration
Not For
- • JavaScript-first projects without TypeScript — MikroORM's benefits diminish significantly without TypeScript
- • MongoDB document workloads where Mongoose's schema flexibility is more appropriate
- • Teams preferring Prisma's generated client and explicit schema file over decorator-based entity definitions
Interface
Authentication
Library — auth via database connection string in ORM config.
Pricing
MIT licensed.
Agent Metadata
Known Gotchas
- ⚠ Each request should use a forked EntityManager — sharing the global EntityManager across requests causes identity map pollution and stale data
- ⚠ em.flush() persists ALL tracked entity changes — unexpected changes from shared EntityManager can cause unintended writes
- ⚠ MikroORM 6.x has breaking changes from 5.x including collection API changes and relation loading — verify version before using docs
- ⚠ Lazy loading requires active EntityManager context — accessing unloaded relations outside a transaction throws LazyLoadingError
- ⚠ Migration files are generated diffs — running mikro-orm migration:create on a modified schema produces only the delta, not the full schema
Alternatives
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Scores are editorial opinions as of 2026-03-07.