unified-language-server | Language server for content | Code Analyzer library

The issue is because jupyter server is unable to find the language servers. As in my case, jupyter is installed and maintained using conda environment(miniconda) under /opt/miniconda3/, whilst my nodejs is sitting under /usr/local/. Ideally, if you are already using conda manager, you will want to uninstall nodejs completely and reinstall it using conda. Otherwise, remove the entire anaconda/conda and then reinstall python (https://www.python.org/downloads/release/python-381/) and jupyter using either pip or brew depending how/where you installed nodejs.

I was able to resolve my issue following below steps:

1.) Completely uninstall node js. I was able to do it by running nvm uninstall or if you are using homebrew, run brew uninstall node and then rm -f /usr/local/bin/npm on terminal. Additionally, you can follow below reference: How do I completely uninstall Node.js, and reinstall from beginning (Mac OS X)

2.) Reinstall nodejs. conda install -c conda-forge nodejs

3.) Install the language servers. See reference: https://github.com/krassowski/jupyterlab-lsp/blob/master/LANGUAGESERVERS.md#installing-language-servers

4.) Restart terminal and run jupyter lab.

Now this is the best answer that I have that was able to resolve my issue.