How to fix the “Failed to build the application error” in Hostinger Node.js

Troubleshoot and resolve the “Failed to build the application” error during your Hostinger Node.js deployment

Updated 2 weeks ago

The Failed to build the application error occurs when the Hostinger deployment engine cannot complete the build scripts defined in your project.

This is a general error message. The exact cause is usually related to configuration mismatches, missing dependencies, or incorrect environment settings, and can be identified in the build logs.

Step 1 – Verify the Node.js parameters in hPanel

A common cause for build failures is a parameter mismatch between your local development environment and the configuration in hPanel.

  1. Go to hPanel → Websites.
  2. Click on Dashboard next to your Node.js website.
  3. Open the Deployments section.
  4. Click the arrow (❯) next to the failed deployment.

Check the following:

  • Ensure the Node.js version displayed matches the engines field in your package.json file and that your project is created in a supported version (18.x, 20.x, 22.x, or 24.x).
  • Verify that the framework and root directory match with your settings.

If you find a mismatch:

  1. Click Settings and redeploy.
  2. Update the configuration as needed.
  3. Reupload or syng your project.
  4. Click Save and redeploy.

Step 2 – Configure Hostinger environment variables

Missing or incorrect environment variables can cause the build to fail.

  1. Go to Deployments → Settings and redeploy.
  2. Scroll to Environment Variables.
  3. Ensure all required variables (such as database URLs or API keys) are defined correctly.
    1. Add, update or removed variables as needed. You can also import variables in bulk by clicking on import .env.
  4. Click Save and redeploy to apply the changes.

Step 3 – Check the build command and dependencies

Ensure your project is configured correctly for deployment.

  • Build and start scripts: Verify that your package.json includes valid scripts and that the start command points to the correct entry file. Supported package managers include npm, yarn, and pnpm.
  • Dependencies: If the error appeared after recent changes, check whether new packages were added. Do not include the node_modules folder in ZIP uploads or repositories, as dependencies are installed during deployment.
  • Port configuration: Ensure your application listens on port 3000.

 

Most “Failed to build the application” errors can be resolved by aligning your Node.js settings, environment variables, and project configuration with your application requirements. After correcting these, redeploy your application and review the build logs to confirm the issue is resolved.

Additional resources