Turn OpenAPI to Universal TypeScript SDKs

In plain words

A code generator that transforms OpenAPI documents into TypeScript SDKs compatible across multiple JavaScript runtimes including Node.js, Deno, and Bun. The tool is designed for API developers who need to support diverse environments and modern API interaction patterns like server-sent events and file streaming. It aims to reduce the complexity of maintaining separate SDKs for different platforms by generating universal, high-quality TypeScript libraries from a single OpenAPI specification.

written from the facts on this page · September 2026

From the sources

Turn your OpenAPI spec into type-safe, idiomatic SDKs across multiple languages. Production-ready, fully customizable, and built for internal and external APIs alike. Optimised for coding agents.

Upload your OpenAPI spec and generate production-ready, type-safe SDKs in your team's preferred languages. Speakeasy's SDK Generator handles everything from OAuth 2.0 and custom logic to retries, pagination, and full documentation. Start with your OpenAPI specification. Speakeasy validates your spec and prepares it for SDK generation across multiple languages. Generate SDKs in TypeScript, Python, Go, Java, C#, PHP, and more. Each SDK is idiomatic and follows language-specific best practices. Use overlays and hooks to modify SDK functionality, structure, and behavior without altering the core generation process. Incorporate SDK generation into your CI/CD workflows. Every API change…from speakeasyapi.dev

In the maker’s words, at launch

Hi HN! We’re excited to share our new code generator that lets you ship high-quality TypeScript SDKs, that your users will love, from your OpenAPI documents. Our ongoing goal is to help you build one SDK that runs anywhere modern JavaScript runs. This includes new runtimes like Deno and Bun in addition to the…

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