My project using next.js ecommerce starter is not running locally

The error message is telling you exactly what's wrong - you have two issues to fix:

1. Missing node_modules: You haven't installed the dependencies yet
2. Vercel CLI not found: The vercel command isn't available

Here's how to fix this:

Step 1: Install dependencies

npm install

This will install all the packages listed in your package.json, including the project dependencies and the Vercel CLI (if it's in the dependencies).

Step 2: Install Vercel CLI globally (if needed)

If vercel still isn't found after npm install, you may need to install the Vercel CLI globally:

npm install -g vercel

Step 3: Run the development server

After installing dependencies, use the correct command. Looking at your error, the start script runs vercel dev, but for local Next.js development you typically want:

npm run dev

This should run the standard Next.js development server. If the project is configured to use vercel dev specifically, then after installing dependencies, you can use:

npm start

Quick Summary: The issue wasn't with your environment variables or Vercel configuration - you simply skipped the npm install step that installs all the project dependencies. The warning message even tells you this: "Local package.json exists, but node_modules missing, did you mean to install?". Always run npm install (or yarn install) right after cloning or creating a new project before trying to run it.

If you continue to have issues after installing dependencies, check the package.json file to see what scripts are actually available and what they do. The dev script is typically what you want for local development with Next.js and Sanity.