How to fix npm ERR! Unexpected end of JSON input in npm

# Count opening vs closing braces
grep -o "{" package.json | wc -l
grep -o "}" package.json | wc -l

# Should be equal

tail -5 package.json

# Should end with:
# }

rm package-lock.json
npm install

npm cache clean --force
rm -rf node_modules
npm install

# Check what changed
git diff package.json

# Restore previous version
git checkout HEAD -- package.json

# Or from specific commit
git checkout abc123 -- package.json

// Truncated file might look like:
{
  "name": "pkg",
  "dependencies": {
    "lodash": "^4

// Add missing content:
{
  "name": "pkg",
  "dependencies": {
    "lodash": "^4.17.21"
  }
}