Reactjs – React Build Error – Unexpected end of JSON input

I’m completely at a loss. I have a React app I’ve been working on for some time and yesterday I found I was unable to build it. I keep getting the following error on ‘npm run build’:
Creating an optimized production build…
Failed to compile.

Unexpected end of JSON input

Steps I have taken:

• npm cache clean –force
• rm -rf node_modules package-lock.json
• rm -rf ~/.npm
• npm install
• checked all .json formatting
• tested the package.json file with node -e
• Used yarn to build (same error)

I have created a new React project and was able to build without errors.
I have taken all the packages from package.json in my problem project, pasted them into a new project and was able to build without error.

I’m not sure what to do now other than completely rebuild my project piece by piece.