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orval
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. 🍺
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I use Orval at work. https://orval.dev/
The advantage really comes when you using libraries like https://resthooks.io/ that enforce and infer strong types without effort from you. Then all you're doing is writing the types. Even cases like typos get removed due to typeahead helping you out. This is especially helpful in large projects with many developers as you'll likely be frequently working with types someone else defined and you don't know their members off the top of your head.