JSON content format as a prompt?

I’ve been experimenting with prompt formats and was curious about something. Instead of writing prompts in plain text, has anyone here tried structuring them in JSON format? For example, using keys and values to organize context, instructions, and expected outputs.

If you’ve tested this, how did it compare? Did you notice clearer results, different behavior, or weaker performance?

Would love to hear your experiences, whether it worked better, worse, or simply different.

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