This error occurs when you run an npm workspace command with a filter that doesn't match any workspace in your monorepo. It typically happens due to package name mismatches between what you specify with --workspace and what's configured in package.json files.
The ENOWORKSPACES error indicates that npm couldn't find any workspace packages matching your filter criteria. This typically occurs when you specify a workspace name with --workspace that doesn't match the name field in any package.json, or when you're running a command that doesn't support workspaces.
Check the exact package names configured in your monorepo. Look at the 'name' field in each workspace's package.json:
{
"name": "@mycompany/my-package",
"version": "1.0.0"
}Note the full package name including any @scope prefix.
Use the exact package name from package.json, not the folder name:
# WRONG - using folder name
npm run build --workspace=my-package
# CORRECT - using the name field
npm run build --workspace=@mycompany/my-packageCheck what workspaces npm recognizes:
cat package.json | grep -A 5 '"workspaces"'Then check each workspace's package.json name field.
You can use --workspace with a directory path:
# Target a specific directory
npm run build --workspace packages/app
# Run in ALL workspaces
npm run build --workspacesNote: Use --workspaces (plural) to run in all workspaces.
Some npm commands don't support workspaces. Use --no-workspaces:
npm config list --no-workspacesIf not all workspaces have the same npm script, use --if-present:
npm run test --workspaces --if-presentThis skips workspaces without the target script.
The ENOWORKSPACES error is fundamentally a filter matching issue. npm uses exact string matching on the 'name' field from package.json files—it does not support glob patterns or fuzzy matching. When you use --workspace, npm reads your root package.json workspaces array to find workspace directories, then reads each workspace's package.json to get its name. Your filter must match one of those names exactly.
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