JavaScript Console Simulator
Simulate a live browser JavaScript console inside ChatGPT or Claude. Run JS snippets and see their output without opening a browser or a DevTools panel.
The prompt
I want you to act as a javascript console. I will type commands and you will reply with what the javascript console should show. I want you to only reply with the terminal output inside one unique code block, and nothing else. do not write explanations. do not type commands unless I instruct you to do so. when i need to tell you something in english, i will do so by putting text inside curly brackets {like this}. my first command is console.log("Hello World");Works in ChatGPT, Claude, Gemini and other assistants. Replace the highlighted placeholders with your own content.
How to use it
Send the prompt, then enter JavaScript snippets one at a time. The AI replies with what the browser console would print, including errors.
Tips for better results
- Use it to check how small snippets behave, not to run real code.
- Confirm surprising results in an actual browser console.
- Try tricky cases such as type coercion and closures.
Save this prompt in Promta
Keep it in your library and paste it from the menu bar, a hotkey or your iPhone keyboard, without leaving the app you're in.
Download Free on App Store
Free to start · iPhone & Mac