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TypeSpec

TypeSpec is ranked #5 of 33 in code generators on Freedom251. It runs on Browser extension, Linux, macOS, Web, Windows. There is a free plan.

TypeSpec plans and pricing

TypeSpec Free Open-source project; TypeSpec CLI and online playground typespec.io · 3 Oct 2026

Compared on code generators

OpenAPI support: Yes
AsyncAPI support: No
Mock server: Yes
Contract validation: Yes

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TypeSpec

Purpose: TypeSpec is a language for designing APIs and data models, then generating schemas, API specifications, code, and documentation.
Language: TypeSpec is inspired by TypeScript and is described as a lightweight language for defining API shapes.
Output formats: The standard library supports OpenAPI 3.0, JSON Schema 2020-12, and Protobuf.
OpenAPI workflow: TypeSpec can generate OpenAPI specifications for use with tools for API gateways, code generation, and data validation.
Data validation: The JSON Schema emitter can produce schemas from shared models for validating data.
Editor integrations: TypeSpec provides language support for VS Code and Visual Studio, including syntax highlighting and code completion.
Extensibility: Developers can write custom emitters or add metadata with custom decorators.
Installation: The CLI is available as an npm package for Node.js or as a standalone executable marked experimental; installation instructions cover macOS, Windows, and Linux.
Browser playground: The official site links to a TypeSpec Playground for trying TypeSpec in a browser.
Authentication modeling: The HTTP library's @useAuth decorator supports applying authentication schemes to a service namespace, sub-namespace, interface, or operation.
Supported auth schemes: Documented security scheme options include HTTP authentication, API keys, OAuth2, and OpenID Connect.
Publisher and support: TypeSpec is described as a Microsoft-built, community-supported project.
Pricing: The official homepage and documentation pages reviewed present TypeSpec as an installable project and do not list paid plans or prices.
Built-in formats: Its standard library supports OpenAPI 3.0, JSON Schema 2020-12, and Protocol Buffers (Protobuf).
Price from: Free

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Where it ranks on Freedom251

Best Code Generators in 2026#5 of 33
Best API Design Tools in 2026#8 of 26

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Sources

typespec.io· checked 3 Oct 2026
typespec.io/docs/· checked 3 Oct 2026
typespec.io/docs/libraries/http/authentication/· checked 3 Oct 2026
typespec.io/docs/introduction/editor/vscode/· checked 3 Oct 2026
typespec.io/playground/· checked 3 Oct 2026
typespec.io/docs/extending-typespec/emitter-framewo· checked 3 Oct 2026
typespec.io/docs/emitters/clients/introduction/· checked 3 Oct 2026