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. Learn more →
Top 23 TypeScript OpenAPI Projects
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full-stack-fastapi-template
Full stack, modern web application template. Using FastAPI, React, SQLModel, PostgreSQL, Docker, GitHub Actions, automatic HTTPS and more.
Project mention: Crushing the Command Line: How I Used Amazon Q to Build a Smarter FastAPI Scaffolder | dev.to | 2025-05-10Existing scaffolding tools like the official FastAPI template often lack production readiness or are too rigid. This tool is built to be both flexible and easy to use.
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Civic Auth
Auth in Less Than 5 Minutes. Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
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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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API Platform
🕸️ Create REST and GraphQL APIs, scaffold Jamstack webapps, stream changes in real-time.
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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 -
Project mention: openapi-fetch-gen – Generate TypeScript API client from OpenAPI TypeScript interface definitions created by openapi-typescript | dev.to | 2025-04-20
openapi-ts/openapi-typescript is a powerful tool for generating TypeScript schema definitions from OpenAPI 3 specifications. The same organization also provides openapi-fetch, a type-safe fetch client library designed to work seamlessly with these generated schemas. Although very useful, one notable hurdle with openapi-fetch is that developers must manually implement client code for each API endpoint.
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loopback-next
LoopBack makes it easy to build modern API applications that require complex integrations.
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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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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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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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graphql-mesh
🕸️ GraphQL Federation Framework for any API services such as REST, OpenAPI, Swagger, SOAP, gRPC and more...
Project mention: Effortless Type-Safe GraphQL SDK Generation with GraphQL SDK Generator | dev.to | 2024-09-01Whenever the schema changes, simply re-run the generator, and the TypeScript code is updated effortlessly. This significantly improves development efficiency and streamlines SDK maintenance. While there are other tools on the market, such as GraphQL Mesh it comes with many dependencies and boilerplate code you might not need, and the SDK is closely tied to it. In contrast, graphql-sdk-generator gives you full control. Once the code is generated, you're free to modify it as needed, with only the graphql-request dependency required for making requests to your endpoint.
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tailchat
Next generation noIM application in your own workspace, not only another Slack/Discord/Rocket.chat
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openapi-typescript-codegen
NodeJS library that generates Typescript or Javascript clients based on the OpenAPI specification
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After evaluating multiple SDK-as-a-service vendors, including Speakeasy, Fern and Liblab, we selected Speakeasy as our strategic partner. Speakeasy’s philosophy aligns with our mission to deliver an outstanding developer experience. Here’s why we’re excited about this partnership:
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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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zenstack
Fullstack TypeScript toolkit that enhances Prisma ORM with flexible Authorization layer for RBAC/ABAC/PBAC/ReBAC, offering auto-generated type-safe APIs and frontend hooks.
Project mention: A Principled Approach to Querying Data – A Type-Safe Search DSL (TypeScript) | news.ycombinator.com | 2025-04-24It's most probably ZenStack given the description: https://zenstack.dev/
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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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elements
Build beautiful, interactive API Docs with embeddable React or Web Components, powered by OpenAPI and Markdown. (by stoplightio)
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> using the same language on the backend and frontend is underrated feature
I agree, but you can definitely do this without SSR or Next.JS. Common examples are tRPC, Zodios, or even just plain fetch calls with shared type definitions.
- https://trpc.io/
- https://www.zodios.org/
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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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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.
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 OpenAPI discussion
TypeScript OpenAPI related posts
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How to Create Developer-Friendly API Portals
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openapi-fetch-gen – Generate TypeScript API client from OpenAPI TypeScript interface definitions created by openapi-typescript
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Improving Cross-Team Collaboration with API Documentation
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Creating an API style guide
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Custom Scopes in OAuth: Step-by-Step Guide
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OpenAI adds MCP support to Agents SDK
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Common Mistakes in RESTful API Design
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A note from our sponsor - SurveyJS
surveyjs.io | 13 May 2025
Index
What are some of the best open-source OpenAPI projects in TypeScript? This list will help you:
| # | Project | Stars |
|---|---|---|
| 1 | full-stack-fastapi-template | 32,472 |
| 2 | redoc | 24,403 |
| 3 | API Platform | 8,892 |
| 4 | mockoon | 7,101 |
| 5 | openapi-typescript | 6,826 |
| 6 | loopback-next | 5,011 |
| 7 | prism | 4,547 |
| 8 | openapi-devtools | 4,192 |
| 9 | graphql-mesh | 3,385 |
| 10 | tailchat | 3,242 |
| 11 | openapi-typescript-codegen | 3,183 |
| 12 | fern | 3,037 |
| 13 | ts-rest | 2,783 |
| 14 | spectral | 2,722 |
| 15 | zenstack | 2,479 |
| 16 | openapi-ts | 2,453 |
| 17 | elements | 2,035 |
| 18 | zodios | 1,800 |
| 19 | openapi-generator-cli | 1,626 |
| 20 | Optic | 1,443 |
| 21 | zod-to-openapi | 1,196 |
| 22 | redocly-cli | 1,141 |
| 23 | SOFA | 1,094 |
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Auth in Less Than 5 Minutes
Civic Auth comes with multiple SSO options, optional embedded wallets, and user management — all implemented with just a few lines of code. Start building today.
www.civic.com