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Top 23 TypeScript Openapi3 Projects
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The OpenAPI Specification (formerly Swagger) has become the industry standard for documenting RESTful APIs. Tools like Swagger UI and ReDoc can generate interactive documentation from OpenAPI definitions, reducing the effort to maintain quality documentation.
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SurveyJS
JavaScript Form Builder with No-Code UI & Built-In JSON Schema Editor. Add the SurveyJS white-label form builder to your JavaScript app (React/Angular/Vue3). Build complex JSON forms without coding. Fully customizable, works with any backend, perfect for data-heavy apps. Learn more.
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mockoon
Mockoon is the easiest and quickest way to run mock APIs locally. No remote deployment, no account required, open source.
Project mention: Mockoon is the easiest and quickest way to run mock APIs locally | news.ycombinator.com | 2025-05-06 -
OpenAPI TypeScript is the closest thing I’ve found to perfection when your API is written in a different language than your client.
https://openapi-ts.dev/
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prism
Turn any OpenAPI2/3 and Postman Collection file into an API server with mocking, transformations and validations. (by stoplightio)
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The release is split into two phases. The first has happened and is the release of standalone client-based tools and the algorithm that powers the entire system. These tools let users generate OpenAPI specifications for any API, internal or external. There is a desktop application with a proxy that can easily be toggled to capture network traffic on a local port that then becomes an OpenAPI specification in real time. There is also a browser extension in the spirit of OpenAPI DevTools, and a website that lets users upload HAR files directly. There is also a command line tool.
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spectral
A flexible JSON/YAML linter for creating automated style guides, with baked in support for OpenAPI (v3.1, v3.0, and v2.0), Arazzo v1.0, as well as AsyncAPI v2.x.
Project mention: Show HN: FastOpenAPI – automated docs for many Python frameworks | news.ycombinator.com | 2025-03-22Are you trying to prune inaccessible types or something?
I'm not sure what you mean by concise complete subset, but in the past I had good success with custom rules in spectral [0].
[0] https://github.com/stoplightio/spectral
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openapi-ts
🚀 The OpenAPI to TypeScript codegen. Generate clients, SDKs, validators, and more. Support: @mrlubos
Project mention: Streamlining Umbraco Headless Development: Automated Model Generation for Content Delivery API with Orval | dev.to | 2025-04-10I chose Hey API as my initial solution for model generation since it's used by Umbraco itself and had been recommended in several developer blogs I follow. Hey API is powerful and rapidly evolving, which is both a blessing and a curse - it offers many features but sometimes it's challenging to keep up with its pace of change.
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InfluxDB
InfluxDB – Built for High-Performance Time Series Workloads. InfluxDB 3 OSS is now GA. Transform, enrich, and act on time series data directly in the database. Automate critical tasks and eliminate the need to move data externally. Download now.
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elements
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown. (by stoplightio)
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Let’s learn how to generate an API client for an Angular project using the open-source OpenAPI Generator program. The OpenAPI Generator project offers a CLI for generating API client modules for multiple language targets by importing a YAML/JSON API specification file.
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Optic
OpenAPI linting, diffing and testing. Optic helps prevent breaking changes, publish accurate documentation and improve the design of your APIs.
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redocly-cli
⚒️ Redocly CLI makes OpenAPI easy. Lint/validate to any standard, generate beautiful docs, and more.
I was recently asked for my favorite resources and best practices for writing clear and structured API docs. I've developed my own style for writing API docs, but up until now I haven't published it. Although I've mainly worked with REST APIs, this guidance applies equally to GraphQL and any other APIs. But before I get to writing style, the most important requirement for good API docs is a good API. If you're using REST, validate it with Stoplight. If endpoints are inconsistent in how they handle common parameters, there's no way to write around the problem. This seems to be more of an issue with REST and may account for the move away from REST toward GraphQL. The next thing that you need is static, searchable docs. Don't expect your GraphQL users to find the information they need by browsing your schema in Apollo. Don't expect your REST users to scroll to the bottom of the Swagger UI page to find out how to format data for a given endpoint. If you need a no-budget solution, Redocly CLI and Magidoc are good places to start for REST and GraphQL respectively. Unless you use AWS hosting (which doesn't play nicely with Magidoc's clean URLs). And don't think that you're done when you've published your schema. Developers need workflows, code examples and reference information to understand how they are expected to use your API. Ideally, this information should live in a public developer portal. Your rivals are not going to be able to clone your product by examining your API. And even if they start adding features based on it, you'll always be several steps ahead.
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express-openapi-validator
🦋 Auto-validates api requests, responses, and securities using ExpressJS and an OpenAPI 3.1.x or 3.0.x specification
Project mention: Create a Node.js REST API with an OpenAPI description in minutes | dev.to | 2025-05-09@apexjs-org/openapi is an OpenAPI 3.1+ description library for TypeScript. You can use this package to easily create a type-safe OpenAPI (Swagger) description with Zod schema support in Node.js. In this tutorial, we use express-openapi-validator to bring the OpenAPI description to life with automatic validation and request handling.
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You might like zod-openapi (https://github.com/samchungy/zod-openapi). You write Zod schemas which, on their own, are a great way to define a validation and de/serialization layer in your API and you then can additionally use them to generate an OpenAPI doc.
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SaaSHub
SaaSHub - Software Alternatives and Reviews. SaaSHub helps you find the best software and product alternatives
NOTE:
The open source projects on this list are ordered by number of github stars.
The number of mentions indicates repo mentiontions in the last 12 Months or
since we started tracking (Dec 2020).
TypeScript Openapi3 discussion
TypeScript Openapi3 related posts
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Create a Node.js REST API with an OpenAPI description in minutes
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openapi-fetch-gen – Generate TypeScript API client from OpenAPI TypeScript interface definitions created by openapi-typescript
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Creating an API style guide
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Show HN: Generate API specifications for any API locally with no effort
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Show HN: Borea: generate typesafe SDKs from OpenAPI
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How To Make API Governance Easier
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Microsoft TypeSpec
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A note from our sponsor - InfluxDB
www.influxdata.com | 20 May 2025
Index
What are some of the best open-source Openapi3 projects in TypeScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | redoc | 24,434 |
| 2 | mockoon | 7,117 |
| 3 | openapi-typescript | 6,860 |
| 4 | prism | 4,552 |
| 5 | openapi-devtools | 4,199 |
| 6 | spectral | 2,731 |
| 7 | openapi-ts | 2,491 |
| 8 | elements | 2,045 |
| 9 | openapi-generator-cli | 1,636 |
| 10 | Optic | 1,445 |
| 11 | zod-to-openapi | 1,199 |
| 12 | redocly-cli | 1,154 |
| 13 | express-openapi-validator | 957 |
| 14 | openapi-codegen | 569 |
| 15 | spot | 565 |
| 16 | docusaurus-openapi | 528 |
| 17 | oazapfts | 528 |
| 18 | chanfana | 522 |
| 19 | typeconv | 434 |
| 20 | zod-openapi | 415 |
| 21 | routing-controllers-openapi | 316 |
| 22 | openapi-typescript-code-generator | 199 |
| 23 | OpenAPIValidators | 193 |
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