JSON Schema Inferer - Draft-07 Schema from JSON or API URL

JSON Schema Validator & Generator — Infer, Validate & Document

perryay/json-schema-validator-generator

Infer JSON Schema from sample JSON data and validate JSON documents against existing schemas. Supports Draft-04, Draft-07, and 2019-09. Features nested objects, array item type inference, enum detection, batch validation, and human-readable schema documentation generation.

LLM Output Validator: JSON Schema + Repair Hints

codeclouds/llm-output-validator

Validate LLM/tool-call JSON output against a JSON Schema (draft-07 or 2020-12) — get machine-readable error paths, concrete repair hints per error, and optional deterministic normalization/repair.

Structured Data Extractor — URL to JSON

shelvick/structured-extractor

Extract structured data from a batch of URLs as schema-validated JSON. Send web pages and a JSON Schema; it scrapes each (stealth + residential proxy as needed), runs an LLM to convert the page to JSON matching your schema, and validates per URL. Omit schema for best-effort. Public pages only.

Validate Schema.org structured data for SEO. Parses JSON-LD, detects Microdata and RDFa, highlights schema types, and reports common issues like invalid JSON-LD, missing @type, non-schema.org @context, and missing key properties for popular schema types.

Provide one or more JSON samples (inline or from URLs) and get an inferred JSON Schema (Draft 7 / 2020-12) describing their shape. Bootstrap API validators, Apify input schemas, BigQuery / DuckDB schemas. Powered by genson. $0.01 per inference.

🔥 7-DAY LAUNCH SPRINT (May 1–8, 2026): First 100 runs free for new users. JSON Schema toolkit: automatically infer schemas from JSON data, validate documents against schemas, and generate TypeScript type definitions. Essential for API development and data validation workflows.

JSON Schema Batch Validator

junipr/json-schema-batch-validator

Validate JSON/JSONL batches against JSON Schema and return row-level validation errors and summaries.

Apify Dataset JSON Schema Validator

automation-lab/apify-dataset-json-schema-validator

Validate inline JSON records or Apify dataset items against JSON Schema with structured errors and summary counts.

Validate a stream of JSONL/NDJSON records against a JSON Schema (draft-07 subset) one line at a time. Per-record error rows, drop-or-tag policy, summary by error type. Pairs with json-schema-validator + jsonl-to-csv.

Schema Markup Extractor - JSON-LD SEO Data

benthepythondev/schema-markup-extractor

Extract Schema.org JSON-LD structured data from web pages, including schema types, nodes, block counts and parse errors.