Here are quick fixes for the most common problems learners run into.
Code will not run
- Check the console for an error message and the line number.
- Make sure you did not delete starter code that the tests rely on.
- Verify that your function names and variable names match the instructions.
- Try pressing Run again. The execution environment occasionally times out.
The preview panel is blank
- Confirm the output is directed to the preview, not the console.
- Make sure your HTML file is named
index.htmlif the lesson expects it. - Check the browser console for JavaScript errors.
I cannot sign in
- Check your email and password.
- If you use magic links or SSO, make sure the link has not expired.
- Try a different browser or clear cookies for nextdeveloper.com.
My progress disappeared
Progress is tied to your account. If you used the site without signing in, make sure you sign in with the same email. Free users keep progress across sessions after signing up.
Still stuck?
Ask in the Community Forum or email hello@nextdeveloper.com.