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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.
You can read a little about environment variables here: https://en.wikipedia.org/wiki/Environment_variable. After reading about environment variables, the error is pretty straightforward: it tried to read the value of the environment variable PORT but it couldn't find it. To make managing these environment variables convenient, the project uses a dotenv inspired solution, where the environment variables are defined in an .env file which is then read by the program. The repository contains an example of such a file: https://github.com/JSH32/Backpack/blob/master/.env.example. You can get started by renaming it into .env and going through the file, filling in any missing values like the one for DATABASE_URL.
You can read a little about environment variables here: https://en.wikipedia.org/wiki/Environment_variable. After reading about environment variables, the error is pretty straightforward: it tried to read the value of the environment variable PORT but it couldn't find it. To make managing these environment variables convenient, the project uses a dotenv inspired solution, where the environment variables are defined in an .env file which is then read by the program. The repository contains an example of such a file: https://github.com/JSH32/Backpack/blob/master/.env.example. You can get started by renaming it into .env and going through the file, filling in any missing values like the one for DATABASE_URL.
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