If you want to be really sure, you can also first ask it to respond in chat format, and then ask it again to respond in JSON format, if you can afford the cost.
It really isn't necessary when using constrained decoding (aka structured outputs) which guarantees that you'll get JSON output in the correct structure.
It really isn't necessary when using constrained decoding (aka structured outputs) which guarantees that you'll get JSON output in the correct structure.