Building Type-Safe APIs with TypeScript and Prisma

Why Type Safety Matters

Type safety catches errors at compile time rather than runtime, leading to more reliable and maintainable code. When combined with Prisma's auto-generated types, you get end-to-end type safety from your database to your API.

Setting Up Prisma

Prisma provides a type-safe database client that integrates perfectly with TypeScript. Start by defining your schema:

model Post {
  id        String   @id @default(cuid())
  title     String
  content   String   @db.Text
  published Boolean  @default(false)
  createdAt DateTime @default(now())
}

Creating Type-Safe Queries

With Prisma, every query is fully typed. Your IDE provides autocomplete for fields, relations, and filters, making it impossible to write invalid queries.

API Route Validation

Combine Prisma with Zod for request validation to ensure your API endpoints receive properly structured data.

Conclusion

TypeScript and Prisma together create a powerful foundation for building reliable, type-safe applications that scale.