Migrate an existing prototype to version 13

1. If you do not already have it, install Node.js version 22.

2. In the terminal, change to your prototype folder.

3. Run this command to delete your node modules folder:

   rm -rf node_modules

4. Make a backup of your prototype folder. You can do this in Finder or Windows Explorer.

5. In your prototype folder, run this command in the terminal:

   npx govuk-prototype-kit@latest migrate

6. If some migration steps fail, the script will report these.

   If this is the case, contact the GOV.UK Prototype team.

7. If you are using Git, commit these changes.

To run the kit enter npm run dev in your terminal (this used to be npm start).

If your prototype does not work

If your prototype does not work, compare the new package.json file to the package.json file in the backup you made in step 4.

Run npm install PACKAGE-NAME for each package that's missing in the new file.

Contact the GOV.UK Prototype team if you need help.