JSON → Type Schema
Paste JSON and instantly generate type definitions for TypeScript, Python, Go, Rust, Java, C#, Swift, and Kotlin.
No data leaves your browser
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Output
Paste JSON on the left to generate a TypeScript interface.
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Output
Paste JSON on the left to generate a Python dataclass.
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Paste JSON on the left to generate a Go struct.
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Paste JSON on the left to generate a Rust struct.
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Paste JSON on the left to generate a Java record.
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Paste JSON on the left to generate a C# record.
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Paste JSON on the left to generate a Swift struct.
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Paste JSON on the left to generate a Kotlin data class.
JSON to Type Schema Generator — FAQ
- What languages are supported?
- TypeScript interfaces, Python dataclasses, Go structs with JSON tags, Rust structs with serde derives, Java records, C# records, Swift Codable structs, and Kotlin data classes.
- Does it handle nested objects and arrays?
- Yes. Nested objects generate additional named types. Arrays infer the element type from the first element.
- Is my data sent anywhere?
- No. All processing happens entirely in your browser using JavaScript. Nothing is uploaded.
- What happens with null values?
- Null values produce optional or nullable types depending on the target language — optional in TypeScript, Optional in Python, a pointer in Go, and Option in Rust.
- How do I convert a JSON API response to a TypeScript interface?
- Paste your API response JSON into the input, select TypeScript, and click Generate. The tool infers every field's type and outputs a ready-to-use interface block you can copy straight into your project.
- Can the tool handle a root-level JSON array?
- Yes. Paste an array such as [{"id":1,"name":"Alice"}] and the generator uses the first element to infer the item type, producing a typed array or slice definition in the target language.
- What happens with mixed-type arrays?
- Mixed arrays (e.g. [1, "two", null]) produce a union type in TypeScript (number | string | null), Any in Python, interface{} in Go, and serde_json::Value in Rust.
- How do I convert JSON to a Go struct with json tags?
- Select Go from the language dropdown and click Generate. Each JSON key becomes a struct field with its inferred type and a json:"..." tag, ready to paste directly into your Go source file.
- Does the tool work offline?
- Yes. All conversion logic runs entirely in your browser. Once the page has loaded, you can generate types without an internet connection.
- Are field names converted to language conventions?
- JSON key names are used as-is for most languages. Go fields are PascalCased with automatic json:"..." tags. You can rename fields in your editor after generating.
- What does the tool do with deeply nested JSON objects?
- Each nested object becomes its own named type. The parent type references child types by name, keeping the generated code flat and readable at every nesting depth.
- Can I use the generated code directly in my project?
- Yes — the output is valid, copy-pasteable code. For TypeScript you may want to add export. For Python the dataclasses import is included. Minor tweaks like renaming the root type are common.
- Does it generate Zod schemas or JSON Schema?
- Not currently. The tool generates language-native type definitions (interfaces, structs, dataclasses). Zod and JSON Schema output may be added in the future.