Build a Node.js Server: Dynamically Style HTML Pages Based on URL Input

We are importing the express framework, creating an instance of the app, and setting the server to run on port 3000.

We initialize an array called validColorNames to store all the recognized CSS color names.

Checking Inclusion: The function then uses the includes method to check if the normalized color name exists in the validColorNames array. If the color name is found in the array, the function returns true, indicating that the color is valid; otherwise, it returns false.

Color Validation: We use the isValidColorName function to check if the provided color is a valid CSS color name. If valid, we proceed to dynamically generate an HTML response with the specified color; otherwise, we send an error response.

Rendering HTML Response: If the color is valid, we dynamically generate an HTML page with the specified color. The background color of the page is set to the provided color, and the text color is adjusted for readability. The generated HTML includes a basic structure with a title, heading, and paragraph.

Handling Invalid Color: If the color is not valid, we send a 400 Bad Request status along with an error HTML page. This error page includes a simple message indicating that the provided color is invalid.

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