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goeat-api
Discontinued Rest API for a food delivery application - Built with Express, Postgres, Redis, MongoDB and Nodemailer
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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.
But if you decide to go ahead, also consider your backend, this app will need to talk to a server, and then get those orders sent to the business in a timely manner. If you're going to be processing payments, you'll need to do that securely. Your server will function via an API that defines how clients interact with it. Check on GitHub, there's are a lot of things you could use as a starting point, like the GoEat API: https://github.com/LauraBeatris/goeat-api