Automatic TypeScript & Zod Schema Inference from JSON
Modern TypeScript applications and runtime validation pipelines rely on accurate type definitions and Zod schemas. This converter inspects raw JSON objects and arrays in your browser, unifying heterogeneous array elements to detect optional fields (? / .optional()), nullable properties (| null / .nullable()), and union types automatically without sending proprietary API contracts over the network.
Heterogeneous Array Unification
When inspecting JSON arrays of objects, the inference engine merges keys across every item. Properties missing in some array elements are marked with TypeScript optional modifiers (?) or Zod .optional() chains.
Nullability & Union Detection
Fields that contain null alongside primitives or objects are typed as explicit unions (e.g., string | null) or z.string().nullable() so strict TypeScript configurations (strictNullChecks) pass cleanly.
Readonly & Export Controls
Toggle export declarations and immutable readonly property modifiers in one click to match your repository's ESLint and TypeScript compiler conventions.
Frequently Asked Questions
When should I choose a TypeScript Interface vs. a Zod Schema?
TypeScript interface and type declarations exist only at compile time and are erased during transpilation. If you are consuming untrusted external JSON from a webhook, REST endpoint, or user form, generate a Zod Validation Schema so you can parse and validate payloads at runtime with Schema.parse(data) and infer the static type via z.infer<typeof Schema>.
How are nested objects and arrays named?
The generator derives PascalCase sub-interface names from your root type name and property keys, deduplicating nested structures and quoting property keys that contain hyphens or non-identifier characters.