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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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nightwatch
Integrated end-to-end testing framework written in Node.js and using W3C Webdriver API. Developed at @browserstack
The definition of nightwatch-vrt is quite clear from its name. It is a VRT tool that works as an extension to nightwatch.js. Using nightwatch-vrt is pretty straightforward. You only need to invoke the screenshotIdenticalToBaseline function to make a comparison of the current screenshot with the respective baseline image. And if you look at the internal logic of this function then you will find that all it does is wait for an element to be present, then capture the screenshot of that element, compare it with the baseline, and finally return the comparison result. And if you look further into the image comparison logic then you will notice that nightwatch-vrt actually uses JIMP (JavaScript Image Manipulation Program) which is built with Javascript with no native dependencies.
The threshold option in the visual_regression_settings specifies how sensitive the image comparison will be. To understand what all other options mean, you can check out the README file of nightwatch-vrt github repository
The definition of nightwatch-vrt is quite clear from its name. It is a VRT tool that works as an extension to nightwatch.js. Using nightwatch-vrt is pretty straightforward. You only need to invoke the screenshotIdenticalToBaseline function to make a comparison of the current screenshot with the respective baseline image. And if you look at the internal logic of this function then you will find that all it does is wait for an element to be present, then capture the screenshot of that element, compare it with the baseline, and finally return the comparison result. And if you look further into the image comparison logic then you will notice that nightwatch-vrt actually uses JIMP (JavaScript Image Manipulation Program) which is built with Javascript with no native dependencies.
As usual, we start writing our test by making the feature file at first, and the visual check can be done in the step definitions. For the demonstration, I am referencing this project which is a simple to-do app in react.