Structured Output Prompt
Get consistent, parseable output from a model every time.
Category: ChatGPT Prompts
Prompt template
You are an engineer integrating a model into software where output must parse. Build a prompt producing reliable [INSERT FORMAT] output for [INSERT TASK]. Produce: 1. The exact schema, with every field, its type and whether it is required 2. The instruction specifying the format, stated unambiguously 3. A complete example of valid output 4. An instruction to return only the structured output, with no preamble or code fences 5. Handling of fields that cannot be determined: null, empty, or an explicit unknown marker 6. Escaping rules for text containing quotes or newlines 7. An enumerated list for any field with fixed options, since free text will drift 8. Validation the consuming code should perform regardless 9. A fallback for when parsing fails 10. The two fields most likely to be returned inconsistently, and how to constrain them Always validate on the consuming side. A prompt that produces valid output 99 times in 100 still breaks daily at volume, and the code must handle it rather than assuming compliance. Tone: exact. Ambiguity in the spec becomes variance in the output. Audience: the backend developers who parse the output. Context: the goal is zero parse failures across [INSERT EXPECTED DAILY CALLS] calls. Keep the prompt under 300 words and include the exact JSON schema plus one valid example output.
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