How to resolve the error json input?

To resolve the error json input -

In your root folder, where we have a .sfdx/ folder, there might be a json file which has a zero byte file. You might be wondering how to detect a zero byte file in .sfdx/ folder if you have more than 100 files. Please execute below command in bash terminal

  $ find . -type f -empty

Once you execute the above command, please remove files which have been detected as zero byte.

  $ rm -rf 

More details: https://dev.to/praneethkumarpidugu/unexpected-end-of-json-input-in-visual-studio-code-1mim
Now SFDX behind the scenes is happy and feel free to try to reauthorize or change orgs. You should be good