yh-validator
A lightweight form validation library with modular functions
js-search
JS Search is an efficient, client-side search library for JavaScript and JSON objects
@bugsnag/js
Universal Javascript error reporting. Automatically detect JavaScript errors in the browser and Node.js, with plugins for React, Vue, Angular, Express, Restify and Koa.
html2pdf.js
Client-side HTML-to-PDF rendering using pure JS