Head over to the Xano Dashboard and find your project.

On the left sidebar, click on Tables and create a new table called roles.

Set up the roles table with these fields:
   - id (integer, auto-increment, primary key)
   - role_name (string)
   - permissions (JSON or text for a customizable permissions list)

Fill the roles table with the roles you need, like admin, editor, viewer, and so on.

On the left sidebar, go to API and create a new API group or edit an existing one.

For each endpoint, implement access control logic:
   - Use the req.user.role_id to fetch the associated role and its permissions.
   - Check the permissions from the roles table.

Example API Endpoint with access control:
   ```javascript
   let roleInfo = db.roles.find({id: req.user.role_id});
   if (roleInfo.permissions.can_edit) {
     // Allow editing
     // Process request
   } else {
     res.status(403).send('Access Denied');
   }
   ```

Create a middleware section to handle role validation.

Write a middleware function to check user roles and permissions.
   ```javascript
   function roleCheck(requiredPermission) {
     return (req, res, next) => {
       let roleInfo = db.roles.find({id: req.user.role_id});
       if (roleInfo.permissions[requiredPermission]) {
         next(); // Proceed if the user has the required permission
       } else {
         res.status(403).send('Access Denied');
       }
     };
   }
   ```

Apply this middleware to your routes:
   ```javascript
   app.post('/create', roleCheck('can_create'), (req, res) => {
     // Create resource
     res.send('Resource created.');
   });
   ```