Fixing Shopify Node App Local Access Issues

Introduction

Developing a Shopify app using Node.js is an exciting journey, but it can come with its own set of challenges. One common issue developers face is accessing their app locally during development. If you’ve created a Node app using Shopify CLI and find yourself redirected to an undefined OAuth page when trying to access it via localhost, you’re not alone. This blog post will guide you through the process of accessing your Shopify Node app locally and offer insights into development without Ngrok.

Understanding the Redirect Issue

The Root of the Problem

When you attempt to access your Shopify app at localhost:8081, you might encounter a redirect to https://undefined/admin/oauth/authorize?. This unexpected behavior can be frustrating and hinder your development process.

Why It Happens

The redirect occurs due to the default configuration of App Bridge, a crucial component in Shopify app development. App Bridge is designed to handle authentication and ensure your app integrates seamlessly with the Shopify admin interface.

The Impact on Development

This redirect can significantly slow down your development workflow, especially if you’re trying to test and debug your app outside the Shopify admin environment.

The Solution: Modifying App Bridge Configuration

Locating the Configuration File

The key to resolving this issue lies in your app’s configuration. Specifically, you’ll need to modify the App Bridge settings in your project.

Making the Necessary Changes

To stop the automatic redirect, follow these steps:

Locate the _app.js file in your project directory.
Find the App Bridge configuration object within this file.
Look for the forceRedirect property in the configuration.
Change the value of forceRedirect to false.

Understanding the Impact

By setting forceRedirect to false, you’re instructing App Bridge not to automatically redirect to the Shopify admin. This change allows you to access your app directly through localhost without interference.

Developing Without Ngrok

The Challenge with Ngrok

While Ngrok is a popular tool for exposing local servers to the internet, it can sometimes slow down the development process. Many developers seek alternatives for a smoother workflow.

Running the App Without Ngrok

It is possible to run your Shopify app on localhost without using Ngrok. Here’s how:

Instead of using the shopify serve command, use node server.js to run the Koa server.
This approach bypasses Ngrok and runs your app directly on your local machine.

Limitations of Non-Ngrok Development

While developing without Ngrok offers speed benefits, it comes with some trade-offs:

Your app will only be accessible via your localhost address.
The app will be non-embedded, meaning it won’t integrate directly into the Shopify admin interface.
You won’t be able to use App Bridge components in this mode.

Best Practices for Local Shopify App Development

Balancing Speed and Functionality

When developing Shopify apps locally, it’s crucial to find the right balance between development speed and full functionality testing.

Alternating Between Methods

Consider alternating between Ngrok and non-Ngrok development:

Use the non-Ngrok method for rapid iterations and basic functionality testing.
Switch to Ngrok when you need to test full Shopify admin integration or App Bridge components.

Leveraging Shopify CLI

Shopify CLI is a powerful tool for app development. Make sure to explore its features fully to streamline your workflow.

Troubleshooting Common Issues

Handling Access Denials

If you’re unable to access your app even after modifying the App Bridge configuration, double-check your Shopify app settings and ensure all necessary permissions are granted.

Dealing with CORS Issues

When developing locally, you might encounter Cross-Origin Resource Sharing (CORS) issues. Be prepared to configure your server to handle CORS properly for smooth local development.

Resolving Dependencies

Ensure all your Node.js dependencies are up to date and compatible with your Shopify app version to avoid unexpected behavior.

Conclusion

Accessing your Shopify Node app locally doesn’t have to be a hurdle in your development process. By understanding the cause of redirects and knowing how to configure App Bridge, you can create a more efficient development environment. Whether you choose to use Ngrok or opt for direct localhost access, these techniques will help you build and test your Shopify app more effectively. Remember, the key is to adapt your approach based on your specific development needs and the stage of your project.

For more information on Shopify app development, visit https://shopify.dev/apps.