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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.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
MirageJS, through Pretender
Plain ExpressJS server
nock, through stubbing http/https modules
JSON Server
Libraries like Mock Service Worker leverage this unique browser ability gracefully to provision seamless API mocking. Let me know if you would like to learn more about this unusual strategy in the comments below!