“SyntaxError: Unexpected token < in JSON at position 0”

Question

In a React app component which handles Facebook-like content feeds, I am running into an error:

Feed.js:94 undefined \"parsererror\" \"SyntaxError: Un

Answer 1

In my case, I was getting this running webpack, and it turned out to be some corruption somewhere in the local node_modules dir.

rm -rf node_modules
npm install

...was enough to get it working right again.