Deploying TypeScript Express Server to Heroku: Solving the ts-node Not Found Error

Learn how to successfully deploy your TypeScript Express server on Heroku and overcome common issues with `ts-node`.
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Deploying TypeScript Express Server to Heroku: Solving the ts-node Not Found Error

Deploying a TypeScript-based Express server to Heroku can be a tricky process. In this guide, we will explore a common problem that developers face while trying to get their Express applications up and running on the platform, specifically surrounding errors related to ts-node. If you've encountered issues while attempting to deploy your server, stay with us as we break down that challenge and provide a clear solution.

Understanding the Problem

Imagine you have developed a fully functional Express server using TypeScript, and you're ready to share it with the world by deploying it on Heroku. However, when you run your deployment command, you see an error like this in your Heroku logs:

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This error suggests that Heroku cannot find the ts-node package, which you are trying to use in your start script to run your application. Additionally, there can be confusion regarding the appropriate buildpacks to use for TypeScript applications on Heroku.

Solution Breakdown

Let's dive into the solution to fix this common issue. Follow these steps to ensure your application is deployed successfully without running into the ts-node error.

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This line attempts to run your server directly using ts-node, but since Heroku does not have ts-node installed by default, it fails. Instead, follow this directive:

Rewrite your start script to run the compiled JavaScript code instead:

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This change means you are asking Node to run the already compiled code, ensuring you avoid issues related to ts-node not being found.

2. Build Your Project Before Deployment

Ensure your TypeScript project is being compiled before launching the server. You should add a build step to your deployment pipeline. Traditionally, this can be achieved by:

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Updating your Heroku deployment command to include a build step:

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3. Use the Correct Buildpack

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This ensures that your application has access to all necessary Node modules and dependencies during build and runtime.

4. Confirm the Setup

Once you’ve made these changes, you can re-deploy your application on Heroku by following these commands:

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After pushing, check the logs to see if the application starts successfully.

Alternative Hosting Solutions

If you continue to face challenges with Heroku for hosting your Express server and Postgres database, consider alternative platforms like:

Vercel: Known for seamless deployments especially for serverless functions.

Render: Offers a better hosting experience for dynamic applications.

DigitalOcean: Allows you to create droplets where you can set up your own server environment.

Conclusion

Deploying your TypeScript Express server to Heroku doesn't need to be a daunting task. By adjusting your build scripts, using the appropriate buildpack, and ensuring you are running the compiled JavaScript files, you can easily overcome the ts-node errors. Now, you can focus on building your application and leave t