Codegen GitHub Repositories (2026) · Open Source Tools

orval is able to generate client with appropriate type-signatures (TypeScript) from any valid OpenAPI v3 or Swagger v2 specification, either in yaml or json formats. 🍺

Automatically generates Rust FFI bindings to C (and some C++) libraries.

OTel Weaver lets you easily develop, validate, document, and deploy semantic conventions

🧡 Turn your API spec into type-safe code. Generate TypeScript types, API clients, hooks, validators and mocks from a spec such as OpenAPI.

go generate based graphql server library

Types that travel.

One prompt, three native apps: your coding agent builds SwiftUI, Jetpack Compose and TanStack Start apps from one spec.

A tool for generating code based on a GraphQL schema and GraphQL operations (query/mutation/subscription), with flexible support for custom plugins.

It's a New Kind of Wrapper for Exposing LLVM (Safely)

Free, two-way Figma MCP server. Turn designs into framework-aware code, and push code back to the canvas. Works with Claude Code, Cursor, Codex, and any MCP client.

Composable building blocks for full-stack AWS apps — define infrastructure and runtime code together with end-to-end type safety using TypeScript, local mocking, and native client codegen for Kotlin, Swift, and Dart.

Nested copies made easy in Kotlin

Type-safe, import-aware, width-aware code generation across multiple languages

✅ Generate TypeScript interfaces from your JSON serializers

codegen from expression to others, such as polars, pandas

Go test suite framework – BDD vocabulary, lifecycle hooks, fixtures, fuzzing, benchmarking, snapshots. Zero reflection, zero runtime deps – powered by code generation.

A React Native Windows library to use XAML / WinUI controls

A collection of examples to help users get up and running with Smithy