Online Tool Store
package.json Script Explainer
package.json Script Explainer surfaces the pre and post hooks, which is usually where a build's unexplained behaviour comes from.
🔒 This tool runs entirely in your browser. Your files are never uploaded to a server.
Developer
package.json Script Explainer
Frontend preview — no upload or external service.
Script breakdown
Three commands chained with &&, so each runs only if the last succeeded. A prebuild script would run first and a postbuild after — both automatically, which is easy to miss.
How the package.json Script Explainer works
- Paste the script line from package.json.
- Read the operator explanation — && and & behave very differently, and a script using & runs commands in parallel and may exit before they finish.
- Check for pre and post hooks in the same file, which run automatically and are a common source of unexpected behaviour.
FAQ
What is the difference between && and &?
&& runs the next command only if the previous succeeded. A single & runs them in parallel and does not wait, which on Windows behaves differently again and is a frequent source of scripts that appear to pass while failing.
What are pre and post scripts?
Scripts named prebuild and postbuild run automatically before and after build. They are convenient and invisible — a build doing something unexpected is often a pre hook nobody remembered.
Why do scripts fail on Windows but not Mac?
Because shell syntax differs. Setting an environment variable inline, path separators, and rm versus del all break across platforms, which is why cross-platform helpers exist.
How we compare
| Feature | Online Tool Store | A CLI script | An IDE plugin |
|---|---|---|---|
| Operator explanation | ✓ | ✗ | ✗ |
| Lifecycle hooks | ✓ | ✓ | ✗ |
| Nothing uploaded | ✓ | Local | ✗ |
| No install | ✓ | ✗ | ✓ |
package.json Script Explainer surfaces the pre and post hooks, which is usually where a build's unexplained behaviour comes from.