JSON Schema to TypeScript

Convert object, array, enum, const, primitive, anyOf, and oneOf structures to editable TypeScript starter code locally.

JSON SchemaDraft 2020-12-style input

TypeScript starter—

—Properties

—Required paths

—$ref uses

—Max depth

This helper supports common schema structures and local analysis. Generated examples/code/docs are starter output, not a substitute for a complete schema implementation, language-specific code generator, or production validation suite.

Composition-aware TypeScript handoff

The fast converter above remains first and continues to use WTAJsonSchema106. This optional handoff adds root naming, allOf intersections, nullable unions, additionalProperties treatment, local-reference checks, and an explicit compatibility audit for schema features that static TypeScript cannot enforce.

Root type nameUnknown fallbackProperty modifier

TypeScript outputCompatibility audit

Generated types describe static structure; keep runtime validation for constraints TypeScript cannot express.

How to use this JSON Schema to TypeScript

Convert object, array, enum, const, primitive, anyOf, and oneOf structures to editable TypeScript starter code locally.

Supported scope and limits

This browser-local helper is designed around common JSON Schema Draft 2020-12 structures, but it does not claim complete specification coverage. Remote references are not fetched, and generated examples, documentation, TypeScript, Zod, or OpenAPI output should be reviewed and refined against the real schema and application contract before production use.

Practical guide and verification

Use the tool first, then apply these checks to verify the inputs, interpret the result, and hand it off without displacing the primary workflow.

Identify the schema dialect and reference boundary

JSON Schema evolves across drafts, and real schemas can use local definitions, remote references, vocabulary-specific keywords, or recursive structures. Keep the declared draft and reference locations with the generated TypeScript so a partial browser converter is not mistaken for a complete implementation of every dialect feature.

Separate validation semantics from static typing

TypeScript describes compile-time shapes, while JSON Schema can express numeric ranges, string patterns, formats, conditional rules, dependent properties, uniqueness, and other runtime constraints. Generated TypeScript can mirror structure but does not automatically enforce every validation rule at runtime.

Inspect unions, intersections, and optional properties

oneOf and anyOf usually become unions, allOf often becomes an intersection, and properties not listed as required are commonly optional. Review those transformations around discriminated unions, overlapping object branches, nullable values, and additionalProperties because small mapping choices can affect downstream type narrowing.

Keep a compatibility audit with generated code

Before checking generated types into a project, record unresolved references and schema keywords that were simplified or ignored. Compile the output with the project TypeScript version, run real sample data through the authoritative validator, and treat the generated file as a handoff artifact rather than the schema itself.