Json on René Zander | AI Automation Consultanthttps://renezander.com/tags/json/Recent content in Json on René Zander | AI Automation ConsultantHugoenWed, 25 Mar 2026 09:00:00 +0100Claude API Structured Output: Three Patterns for Guaranteed JSONhttps://renezander.com/blog/claude-api-structured-output/Wed, 25 Mar 2026 09:00:00 +0100https://renezander.com/blog/claude-api-structured-output/<p>If you come from the OpenAI SDK, you are used to <code>response_format: { type: &quot;json_object&quot; }</code> or strict JSON schema mode. You pass a schema, OpenAI enforces it at the decoder level, you get parseable JSON or an error. Simple.</p> <p>Claude does not have that. There is no <code>response_format</code> flag, no strict schema decoder, no JSON mode toggle. If you ask Claude nicely for JSON in the prompt, it will usually comply. &ldquo;Usually&rdquo; is not a word I want in production. I run ten AI agents as cron scripts on a Debian VPS. Every one of them parses Claude output into typed objects downstream. One unescaped quote in a string field will take down the pipeline at 06:30 while I am asleep.</p>