Building a Web Page Generator with Next.js, tldraw, and OpenAI

In this blog post, I'll walk you through how I built a web page generator using Next.js, tldraw, and OpenAI. This tool allows users to visually design a web page by drawing an image, which is then converted into an HTML web page.

Steps to Build the App
Step 1: Setting up the tldraw Editor
The first step was to install and integrate tldraw, a powerful and simple drawing editor, into the Next.js application. This editor allows users to sketch or draw the structure of their desired web page.

Once installed, I integrated the tldraw editor into a web page in my Next.js app. Here's a basic setup for the editor:

With this, users can now draw their web page design using the editor's interactive canvas.

Step 2: Converting the Drawing to a Base64 Image
After the user completes their drawing, the next step is to take the SVG image generated by tldraw and convert it to a format that can be sent to OpenAI for interpretation. I first converted the SVG to JPG and then to a base64-encoded image to streamline the process.

Here’s how I handled this conversion:

This code captures the drawing as an SVG, converts it into a canvas, and then converts it to a base64-encoded JPEG image. Once the image is ready, it's time to send it to OpenAI.

Step 3: Sending the Base64 Image to OpenAI for HTML Conversion
Using the OpenAI API, I sent the base64 image along with instructions to generate HTML code representing the drawing. This call leverages the power of OpenAI to interpret visual data and return code.

Here’s how I did it:

This sends the base64 image to the backend, where OpenAI processes it and returns HTML code. The response contains the HTML for the web page based on the design.

Step 4: Parsing and Displaying the Generated HTML
The next step is to parse the returned HTML from the <!doctype> declaration to the closing