JSON Schema (for AI)
Using JSON Schema definitions to constrain and validate structured outputs from language models.
Overview
JSON Schema provides a way to define the expected structure of LLM outputs, ensuring responses conform to specific formats. API providers like OpenAI and Anthropic allow passing JSON Schema definitions that guarantee the model's output will be valid according to the schema.
Applications
JSON Schema validation for AI outputs enables reliable extraction of structured data (names, dates, categories), consistent API responses, database-ready outputs, and interoperability with downstream systems. Combined with function calling, it ensures tool inputs are always properly formatted, which is essential for building reliable AI agent systems.