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code-relay
Source for the Code Relay website. Code Relay The fastest and easiest way to contribute to open source!
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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.
Something very useful is defining types for APIs you might be working with. The usual way I'd go about this is to open the raw JSON of an API response and copy all of it; then use either the online version of this tool or the VSCode extension they provide that allows you to directly paste an interface in TypeScript (among other languages); once you have the interface, you can use it as an explicit type where you receive your API response, and from then on the data you receive from the API will have the correct types. Of course depending on the data, the generated interface might have some quirks here and there, but it's pretty straightforward and you should be able to make your way in.
So I did this https://www.coderelay.io/ thing and they gave me a typescript task.. I've also not used it much, was a fun way to test out how quick I could get into it