Code Tower · room 24
JSON to TypeScript
Generate TypeScript, Go, Python, Java, C# and Rust types from JSON.
🔒 Processed in your browser · No upload · No sign-up
Generate types from JSON
Paste a sample API response and instantly get TypeScript interfaces — or Go structs, Python dataclasses, Java / C# / Kotlin classes, Rust serde structs and Swift Codable types. Types are inferred by quicktype, which merges array items, detects optional fields, enums, dates and nested objects.
Tips for better types
- Include several array items so fields that are sometimes missing are marked optional.
- Use a meaningful top-level name (e.g.
User); nested types are named after their keys. - Untick "Types only" to also generate runtime converters that validate JSON at parse time.
Is my JSON uploaded?
No. quicktype runs in your browser — the engine downloads once (about 1 MB) and your data stays local.