Global Araç
Json Schema To Ts
export interface RootProfile {
url: string;
followers: number;
}
export interface Root {
id: number;
name: string;
active: boolean;
tags: string[];
profile: RootProfile;
}Paste a JSON Schema document and get a matching TypeScript type definition. Different from the json-to-typescript tool which infers types from example data — this one consumes a formal JSON Schema (the standard described at json-schema.org, Draft 7 / 2020-12) and produces types that exactly match the schema’s declarations: required vs optional fields, string enums, oneOf / anyOf unions, format constraints, numeric ranges (as types where possible), and referenced sub-schemas via $ref.
When you’d use this: API integration where the OpenAPI spec includes JSON Schema definitions and you want TypeScript types that match exactly; contract-first development where the schema is the source of truth and types are derived; migrating away from manual types when your existing system uses JSON Schema for validation and you want TypeScript checking too; tooling pipelines where schemas come from upstream services and you want auto-generated TS stubs.
For one-off conversions this is fine; for production builds use a real generator like json-schema-to-typescript (the npm package — comprehensive, handles every spec edge case, integrates into build tools), or openapi-typescript (specifically for OpenAPI specs which embed JSON Schema). This tool covers the 80% case for ad-hoc use; production needs the proper tool.
Nasıl Kullanılır
- Paste your JSON Schema document into the input. The schema should follow Draft 7 or Draft 2020-12 conventions; older drafts have edge cases not all parsers handle.
- The TypeScript output regenerates live as you type. Required fields appear without `?`; optional fields with `?:`; enums as union types; nested object types as separate interfaces.
- Copy the generated types and paste into your `.ts` file. The output is dependency-free TypeScript — no imports needed.
- If your schema has $ref to external files, paste those schemas inline first or resolve them with a tool like ajv before converting.
- For complex schemas with discriminated unions, intersection types, or pattern properties, run through the json-schema-to-typescript npm package — it handles the spec more thoroughly.
Ne Zaman Kullanılır
- Quick one-off conversion of a JSON Schema you got from an API doc.
- Learning how JSON Schema concepts map to TypeScript (read the diff side by side).
- Generating type stubs for prototyping before installing the proper tooling.
- Sanity-checking what TS types a schema implies before committing to a contract.
Ne Zaman Kullanılmaz
- Production builds — use json-schema-to-typescript (npm) which handles every spec edge case and integrates into your build pipeline.
- OpenAPI specs (the schema embedded in YAML/JSON OpenAPI files) — use openapi-typescript instead; it handles request/response/operation typing across the whole API spec.
- Schemas with extensive $ref to external files — those need a proper resolver (ajv, openapi-zod-client) before conversion.
- Runtime validation — types from this tool are compile-time only. For runtime check use Zod, io-ts, ajv, or yup, all of which have their own schema-to-type generation.
Yaygın Kullanım Senaryoları
- Educational use — demonstrating the underlying concept
- Onboarding a colleague who needs the same calculation/conversion
- Verifying a number or output before passing it on
- Quick conversion during a typical workday
Sık Sorulan Sorular
What's the difference vs json-to-typescript tool?
This tool consumes a JSON Schema (a formal description of allowed JSON structures, with required/optional fields, enums, type constraints, validation rules). The json-to-typescript tool infers types from sample JSON data. Schema is more precise (you get exact required-vs-optional, enums, numeric ranges); inference is more convenient when you don't have a schema. Pick based on whether you have a schema or just example data.
Which JSON Schema drafts are supported?
Draft 7 and Draft 2020-12 are both common in 2026. The tool handles the most-used keywords from both: type, properties, required, enum, oneOf/anyOf, $ref (limited), format. Older drafts (4, 6) are mostly compatible. Draft 2019-09 had some keyword changes (definitions → $defs) which the tool handles. Brand-new keywords from latest Draft may not be supported.
Why does my $ref not resolve?
$ref to external files ("$ref": "./other-schema.json") requires file I/O, which a browser tool can't do directly. Inline the referenced schema, or use a desktop tool that can resolve refs across files. $ref to internal definitions ($ref: "#/$defs/Address") within the same document does work.
How are oneOf / anyOf converted?
oneOf / anyOf become TypeScript union types. So `{ "oneOf": [{type:"string"}, {type:"number"}]}` becomes `string | number`. Note: TypeScript's structural type system doesn't perfectly capture JSON Schema's exclusive-vs-inclusive union semantics; for strict discrimination use discriminated unions with a `kind` property.
What about numeric ranges (minimum, maximum)?
TypeScript can't express runtime range constraints in its type system (you can't have `type Age = number where 0 <= Age <= 150` natively). The tool keeps the field as `number` and adds a JSDoc comment with the range. For runtime range checking, use Zod or ajv. TypeScript 4.5+ supports template literal types for narrow string formats but not numeric ranges.
Can I generate Zod schemas instead?
Not from this tool. For Zod from JSON Schema, use json-schema-to-zod (npm package). It produces both runtime validators and TypeScript types from the same schema. For pure TS types from JSON Schema, this tool or json-schema-to-typescript suffice.