I am thinking of creating a web application. The app will analyze the English text. It will need to run text-readability algorithms such as https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests.<p>The app will also need to find the syllable count of the words.<p>Are there reliable NLP JavaScript libraries (just like we've NLTK in Python) that you use in production?<p>Thanks in advance for all help.