API Development

Gemini API: Structured Output with JSON Schema

Name: Gemini API: Structured Output with JSON Schema
Author: Neura Market

Neura Market April 24, 2026

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Forces Gemini to output structured JSON matching a defined schema for API integration.

Prompt

Generate structured JSON output that strictly follows this schema. You MUST output valid JSON and nothing else - no markdown, no explanation, no code fences.

Schema:
{
  "type": "object",
  "properties": {
    "analysis": {
      "type": "object",
      "properties": {
        "summary": {"type": "string", "description": "2-3 sentence summary"},
        "sentiment": {"type": "string", "enum": ["positive", "negative", "neutral", "mixed"]},
        "confidence": {"type": "number", "minimum": 0, "maximum": 1},
        "key_entities": {
          "type": "array",
          "items": {
            "type": "object",
            "properties": {
              "name": {"type": "string"},
              "type": {"type": "string", "enum": ["person", "organization", "location", "product", "concept"]},
              "relevance_score": {"type": "number", "minimum": 0, "maximum": 1}
            },
            "required": ["name", "type", "relevance_score"]
          }
        },
        "topics": {"type": "array", "items": {"type": "string"}},
        "action_items": {"type": "array", "items": {"type": "string"}}
      },
      "required": ["summary", "sentiment", "confidence", "key_entities", "topics"]
    }
  }
}

Content to analyze:
[PASTE CONTENT]

How to Use

Use with Gemini API's response_mime_type: "application/json" for guaranteed structured output.

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