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What is JSON mode in the Messages API?
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intermediate 20 min
JSON Mode
Based on Anthropic Claude documentation and the CCA-F exam blueprint. Updated June 2026.
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A developer enables JSON mode but still gets invalid JSON sometimes. The model's response includes markdown formatting around the JSON. What's wrong?
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A parser downstream of JSON mode often fails because Claude outputs comments within JSON (which is not valid JSON). What's the fix?
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