json-schema-sketchCompact schema inference for AI/LLM contexts

Takes any JSON value and produces a minimal type description. Typically ~80% smaller than raw JSON.

Schema Inference

Infer compact type-trees from any JSON value. Supports arrays, nested objects, optional keys, and union types.

Renders schemas as minimal text like: array(25) of {id: number, name: string}. Not standard JSON Schema — designed for token efficiency.

Resolve dot/bracket paths like data.users[*].id against JSON values with wildcards and structured errors.

Pure TypeScript, no runtime dependencies. Works in Node.js and the browser.