The most requested missing feature was more code generation targets. The main editor's Tools panel has been able to generate Java, C#, Python, and Rust for a while — but until today those languages had no dedicated landing pages, which made them hard to discover and hard to link to.

That changes today. Four new generator pages are live:

• JSON to Java — Jackson-ready POJOs with @JsonProperty annotations, long/double number typing, List<T> for arrays.
• JSON to C# — System.Text.Json-ready classes with [JsonPropertyName] attributes and nullable reference types for null fields.
• JSON to Python — dataclasses with full type hints, Optional[T] for nullables, Union types for mixed fields. Works on Python 3.7+.
• JSON to Rust — serde-ready structs that derive Serialize/Deserialize, with Vec<T>, Option<T>, and i64/f64 inference.

Same privacy model as everything else here

All four generators run quicktype compiled to WebAssembly-in-browser JavaScript — the same engine that powers our existing TypeScript and Go generators. Your JSON sample is parsed and turned into code entirely inside your browser tab. No network request carries your data, because there is no server to carry it to. You can verify this yourself: open DevTools, watch the Network panel, and paste the nastiest internal API response you have.

This matters more for code generation than for plain formatting: the JSON you feed a type generator is usually a real API response — the exact artifact that contains emails, internal field names, and enum values you would rather not ship to a third party.

Why type generators are worth having

Hand-writing DTOs from API responses is one of the last remaining pieces of pure mechanical work in day-to-day programming. A generator does it in seconds, and — because it infers types from actual values — it catches things hand-transcription misses: a field that is sometimes null, an array with mixed item shapes, a number that only looks like an integer.

Each new page includes a worked example, language-specific notes (serde attributes, Jackson annotations, dataclass compatibility), and copy-to-clipboard output. Try them with your own payload — nothing leaves your machine.