How to Fix the dockerfile parse error in Node.js Image Builds

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If you're a developer working with Docker to containerize your applications, you might run into error messages that can be frustratingly vague. One such obstacle is the Error response from daemon: dockerfile parse error line 15: unknown instruction: CMD["NODE". This error typically indicates a problem with the syntax in your Dockerfile, particularly how you’re specifying commands to be executed. In this guide, we'll break down this issue and guide you through the solution step by step.

Understanding the Problem

You received the following error when trying to build your Docker image:

[[See Video to Reveal this Text or Code Snippet]]

This message suggests that there is a syntax error in line 15 of your Dockerfile. In most cases, such errors stem from misformatted commands. It can be tricky to pinpoint the exact mistake, especially when you're eager to get your application up and running.

The Dockerfile Breakdown

Here is the Dockerfile you shared:

[[See Video to Reveal this Text or Code Snippet]]

Identifying the Issue

At first glance, the Dockerfile may look mostly correct, but the problem lies specifically in how the CMD instruction is written. Notice how there is no space between CMD and the opening square bracket ([). This small oversight is causing Docker to misinterpret your instruction.

Proposed Solution

To resolve this error, you need to adjust the format of the CMD command. Here’s what you should do:

Correct the CMD Syntax
Change the CMD lines from:

[[See Video to Reveal this Text or Code Snippet]]

To:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Change
By adding a space between CMD and the opening bracket, Docker can correctly interpret the instruction. This ensures that it recognizes what command to execute when the container starts.

Final Dockerfile Example

Here’s how your corrected Dockerfile should look:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

In Docker, even the smallest syntax issues can lead to significant problems—like the dockerfile parse error you encountered. By simply ensuring proper spacing in your use of the CMD command, you can avoid this common pitfall.

Always remember to check your syntax carefully, as minor details often make a big difference. Happy coding, and may your Docker builds be smooth and error-free!