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microjob
A tiny wrapper for turning Node.js worker threads into easy-to-use routines for heavy CPU loads.
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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.
Real life example: We wanted our website to be static files to save on system time as a kind of caching strategy. So far there are about 100 pages that need to be rendered sometimes when there is an update to the site. Running all of this through our templating engine at once caused the node server to be unresponsive for about 30 to 40 seconds. No joy. There are a few ways to solve this but the one we decided on was to use web worker threads for this execution because this was not going to happen very often. About 5% to 10% of the time. It basically just puts this function (rendering all of the pages) into another thread and returns the result. Now this takes about 15 to 20 seconds and does not hold up the main thread. We used a library called Microjob that makes using a web worker really easy https://github.com/wilk/microjob