NPM Script Builder is a free, browser-based tool built for developers setting up a new project who want a clean, valid scripts block without hand-formatting JSON.
How to use the NPM Script Builder
- Enter a script name (e.g. dev, build, test) and its command in each row.
- Leave rows blank if you don't need all six.
- Click Build scripts block.
- Paste the generated JSON into the "scripts" section of your package.json.
Why use FreeToolsNets's NPM Script Builder?
- 100% free, with no usage limits and no account required.
- Everything runs locally in your browser — nothing you type is uploaded or stored on a server.
- Works on desktop, tablet and mobile in any modern browser.
- No installation, no plugins, and no ads blocking the tool itself.
- Part of FreeToolsNets's Developer & Data Tools collection.
Frequently asked questions
How many scripts can I add?
The form has six rows; for more, merge the JSON output manually.
Does it validate the commands?
No — commands are passed through as-is, so make sure they're correct for your project.
Is this tool free to use?
Yes, completely free on FreeToolsNets, with no sign-up and no limits.
Is my data sent to a server?
No. Everything runs locally in your browser using JavaScript — nothing you enter is uploaded anywhere.
Does it work on mobile?
Yes, the widget is fully responsive and works on phones, tablets and desktops.