{"generatedAt":"2026-07-13T08:01:57.922Z","tool":{"id":"structured-output-validator","name":"LLM Structured Output Validator","description":"Validate structured outputs and tool schemas for OpenAI, Anthropic, MCP, and JSON Schema with detailed errors and fix guidance","category":"ai","icon":"✓","keywords":["llm","structured output","validator","json schema","function calling","tool response","validate"],"hasApi":true,"remoteCallable":true,"remoteMode":"dedicated_api","riskClass":"M","maxInputBytes":262144,"timeoutMs":4000,"supportsStreaming":false,"url":"/structured-output-validator/","tags":["ai","mcp","prompting"],"faqs":[{"question":"What is structured output from an LLM?","answer":"Structured output is JSON that follows a predefined schema, used in function calling responses, tool results, and data extraction. Both OpenAI and Anthropic support structured output modes."},{"question":"What JSON Schema versions are supported?","answer":"The validator supports JSON Schema draft-07 features including type validation, required fields, enums, patterns, min/max values, minLength/maxLength, and nested object/array validation."},{"question":"How do I fix 'missing required field' errors?","answer":"The error shows which field is missing and its expected type. Either adjust your prompt to ensure the LLM includes the field, or update your schema to make the field optional by removing it from the required array."},{"question":"Can I generate sample valid output from a schema?","answer":"Yes, click 'Generate Sample' to create a valid JSON object filled with placeholder values matching your schema. This is useful for testing and as a reference for expected output structure."},{"question":"Does this replace JSON Formatter?","answer":"No. JSON Formatter validates JSON syntax (is this valid JSON?). This tool validates JSON structure against a schema (does this JSON match the expected shape?). They complement each other."}],"howTo":[{"title":"Define JSON Schema","description":"Paste your JSON Schema or select from templates (object with properties, array of records, etc.). The tool validates the schema itself."},{"title":"Paste LLM output","description":"Copy the structured response from your LLM (Claude, GPT, etc.) into the validation panel. Format can be JSON, YAML, or markdown code block."},{"title":"Validate against schema","description":"Click 'Validate' to check if the output matches the schema. Shows specific field violations (type mismatch, missing required fields, enum mismatches)."},{"title":"Debug errors","description":"The tool highlights which fields failed validation and why. Suggests corrections for common issues like wrong data types or invalid enums."},{"title":"Fix and retry","description":"Edit the JSON inline and re-validate. Once passing, export as TypeScript types or use in your application code."}],"agentContract":{"toolId":"structured-output-validator","contractVersion":"2.0.0","remote_callable":true,"remote_mode":"dedicated_api","risk_class":"M","max_input_bytes":262144,"timeout_ms":4000,"supports_streaming":false,"preferred_surface":"dedicated_api","dedicated_api":{"baseUrl":"https://aidevhub.io/api/schema-validator/","openapiUrl":"https://aidevhub.io/api/openapi.yaml","endpoints":[{"method":"POST","path":"/api/schema-validator/","summary":"Validate a tool schema"}],"riskClass":"M","inputMaxBytes":262144,"timeoutMs":4000},"runtime":{"endpoint":"/api/tools/run/","methods":["GET","POST"],"queryParams":[{"name":"toolId","required":true,"description":"Tool identifier"},{"name":"a","required":true,"description":"Primary input"}],"postBodyShape":{"toolId":"string","input":"{ a, b?, c?, mode? }"},"exampleGet":"https://aidevhub.io/api/tools/run/?toolId=structured-output-validator&a=...","policy":{"riskClass":"M","limit":30,"burst":10,"windowSec":60,"inputMaxBytes":262144,"timeoutMs":4000,"cacheTtlSec":0,"networkEnabled":false,"supportsStreaming":false}},"semantic_fields":{"schema":"Field from Schema Validator API","target":"Field from Schema Validator API"}},"relatedTools":[{"id":"json-schema-generator","name":"JSON Schema Generator","url":"/json-schema-generator/","category":"ai"},{"id":"ai-tool-schema-builder","name":"AI Tool Schema Builder","url":"/ai-tool-schema-builder/","category":"ai"},{"id":"token-counter","name":"LLM Token Counter","url":"/token-counter/","category":"ai"},{"id":"prompt-template-builder","name":"Prompt Template Builder","url":"/prompt-template-builder/","category":"ai"},{"id":"llm-output-diff","name":"LLM Output Diff Tool","url":"/llm-output-diff/","category":"ai"},{"id":"context-window-visualizer","name":"AI Context Window Visualizer","url":"/context-window-visualizer/","category":"ai"}]}}