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express-to-fastify-migration
Example applications demonstrating a migration from Express to Fastify.
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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've found that the fastify-express plugin makes migrating from Express to Fastify much easier: https://github.com/fastify/fastify-express. It has full support for Express middleware and routes, allowing you to migrate things in stages if you prefer.
I've put some code on GitHub which shows an Express application before and after migrating it to Fastify, and I've written up the migration steps in How to Migrate Your App from Express to Fastify. Hopefully you find these useful if you decide to give Fastify a try!
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Migrate Your Express Application to Fastify