TypeGraphQL
TypeScript-first GraphQL framework using decorators and classes to define GraphQL schemas. Write TypeScript classes with @ObjectType, @Field, @Resolver, @Query, @Mutation decorators — TypeGraphQL generates the GraphQL schema automatically. Eliminates duplication between TypeScript types and GraphQL SDL definitions. Works with Apollo Server, express-graphql, and other GraphQL servers.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
@Authorized decorator for field/resolver authorization. Security depends on proper GraphQL server configuration. reflect-metadata is a large dependency with potential prototype pollution concerns.
⚡ Reliability
Best When
You're building TypeScript GraphQL APIs and want single-source-of-truth type definitions using decorators — TypeGraphQL eliminates separate SDL and TS type duplication.
Avoid When
You prefer SDL-first schema design, use JavaScript (not TypeScript), or need tree-shaking for small bundles — decorators add runtime overhead and reflect-metadata is heavy.
Use Cases
- • Build type-safe GraphQL APIs where TypeScript class definitions automatically generate GraphQL schema without separate SDL files
- • Reduce boilerplate in GraphQL APIs by colocating TypeScript type definitions with GraphQL resolver logic using decorators
- • Integrate with TypeORM or Prisma via decorator composition — entity classes can serve dual purpose as GraphQL types
- • Add authorization and validation to GraphQL resolvers using middleware decorators without middleware setup boilerplate
- • Generate GraphQL schema programmatically for agent systems that build schemas dynamically from TypeScript class definitions
Not For
- • SDL-first GraphQL development — TypeGraphQL is code-first only; if you prefer writing .graphql files first, use graphql-tools or Pothos
- • Non-TypeScript projects — TypeGraphQL requires TypeScript with experimental decorators and reflect-metadata
- • Lightweight GraphQL APIs without decorator overhead — Pothos offers similar code-first approach with better tree-shaking
Interface
Authentication
TypeGraphQL is a schema-building library — authentication is handled by the underlying GraphQL server (Apollo, Yoga, etc.). TypeGraphQL provides @Authorized decorator for role-based field/resolver access.
Pricing
MIT-licensed open source library.
Agent Metadata
Known Gotchas
- ⚠ Requires 'experimentalDecorators' and 'emitDecoratorMetadata' in tsconfig.json — missing these causes silent runtime failures with no TypeScript error
- ⚠ reflect-metadata must be imported once at application entry point before any TypeGraphQL imports — order matters
- ⚠ TypeGraphQL v2 introduced breaking changes from v1 — resolver class pattern changed; don't mix v1 tutorials with v2 code
- ⚠ Circular references between @ObjectType classes require using lazy type functions: @Field(() => User) — forgetting this causes undefined type errors at startup
- ⚠ Generic types require explicit TypeGraphQL generic factory pattern — native TypeScript generics don't map to GraphQL types without extra boilerplate
- ⚠ Schema building is synchronous at startup — large schemas with many types may slow application boot; pre-build schemas for serverless environments
Alternatives
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Scores are editorial opinions as of 2026-03-06.