Very straight forward prompt
Create a single page HTML that can do the following without any external library and other public scripts, not CSS support library, nothing, just single HTML page in a folder with nothing else. 1. There should be 2 columns layout 2. The left panel is just a huge input box that allow user to input any text. Having JSON syntax highlight is a plus. 3. The right panel react when there are new text input to the left panel. When the left panel is not a valid JSON, there should be a red alert on the top saying the input in not a valid JSON. When the left panel is a valid JSON, it should convert the JSON into a single layer JSON, all the nested object should be flattened and then on the right panel show show a table with one column showing the JSON key and another column showing the JSON value. If the JSON value is a HTML string, it should be rendered out.
| LLM | The result |
|---|---|
| Gemini 3.1 Pro | Go |
| Google AI mode | Go |
| Perplexity | Go |
| Grok | Go |
| Claude Sonnet | Go |
| GitHub Copilot with GPT 4.1 | Go |
| OpenAI GPT-5.3 | Go |
| OpenAI GPT-5.4 Think | Go |
| OpenAI GPT-5.5 | Go |