How to fix npm ERR! code EINVALIDWORKSPACE npm ERR! Invalid workspace configuration in npm

// ❌ Wrong (Yarn format, not supported by npm)
{
  "workspaces": {
    "packages": ["packages/*"]
  }
}

// ✅ Correct (npm format)
{
  "workspaces": [
    "packages/*"
  ]
}

# Check for JSON syntax errors
cat package.json | python -m json.tool

# Or use npm's built-in check
npm pkg get workspaces

# List directories that would match
ls -d packages/*

# Check each has package.json
for dir in packages/*/; do
  if [ ! -f "$dir/package.json" ]; then
    echo "Missing: $dir/package.json"
  fi
done

npm init -w ./packages/missing-package

{
  "workspaces": [
    "packages/*",          // All direct children of packages/
    "apps/*/",             // Trailing slash is optional
    "tools/tool-*"         // Wildcards in names work
  ]
}

# View all npm config
npm config list

# Check for workspaces setting
npm config get workspaces

# Remove if set globally
npm config delete workspaces --location=user