Multi-Language AST Type Studio & Model Generator
Generate production-grade model classes, structs, and data representations from raw JSON payloads. Convert APIs and data samples seamlessly into Java (with Jackson annotations, Lombok @Data, or Java 17+ Records), idiomatic Go structs (with json tags and Golang initialisms), Python Pydantic v2 BaseModels with alias configurations, modern C# positional records, and Rust Serde structs. All parsing and synthesis execute 100% in your browser with zero server uploads.
#How to Use This Tool
#Mathematical Formula & Standards
#Edge Cases & Technical Considerations
Heterogeneous Array Element Unification
When an array contains objects with differing or missing keys, the engine merges their schemas into a unified type where absent keys are safely marked optional or nullable.
Go Acronym & Initialism Idioms
Keys such as "user_id", "api_url", or "http_status" adhere strictly to Go standard library conventions, generating "UserID", "APIURL", and "HTTPStatus" with precise json tags.
Reserved Keyword & Symbol Sanitization
Property names matching language keywords (e.g., "class", "type", "match", "import") or containing special characters are sanitized with appropriate serializer aliases.
#Frequently Asked Questions
Q:Are my JSON payloads or API responses sent to a server?
Never. The AST parsing and multi-language code generation run entirely client-side in your browser. No data leaves your machine.
Q:What Java paradigms are supported?
You can generate standard JavaBeans (POJO with getters, setters, and default constructors), Lombok-annotated classes (@Data, @NoArgsConstructor, @AllArgsConstructor), or modern immutable Java 17+ Records with Jackson annotations.
Q:Does Python generation support Pydantic v2?
Yes. Python generation outputs Pydantic v2 syntax using BaseModel and ConfigDict(populate_by_name=True), with Field(alias="...") for preserving original JSON key casing.
Q:Can I share my generator state with my team?
Yes. Clicking Share encodes your JSON payload and configuration into a compressed URL hash (#v=1&d=...). Because the state resides in the hash fragment, it is never transmitted to web server logs.
Have feedback or feature requests?
Help us improve this utility. Share suggestions, report edge cases, or request new features directly.
#Related Utilities
Explore complementary tools running on-device with zero server upload.
JSON to TypeScript Converter — Strict Interface Generator
Transform raw JSON payloads into clean, idiomatic TypeScript declarations. Nested objects are automatically extracted into distinct, reusable interfaces, array items are type-inferred with union support, and missing keys across array records are cleanly tagged with optional modifiers.
JSON Formatter & Validator — Pretty Print, Minify & Inspect
Format messy or minified JSON into clean, readable code with customizable indentation (2-space, 4-space, or tab). Instantly detect syntax errors with exact line and column coordinates. Optionally sort object keys recursively for deterministic diffing, or minify payloads for production bandwidth efficiency.
CSV to JSON & SQL Converter — RFC 4180 Client-Side Parser
Transform spreadsheet exports, tabular data, and raw CSV files into structured JSON objects or database-ready SQL INSERT queries. Features RFC 4180 compliant quoting, automatic delimiter detection, intelligent type inference (numbers, booleans, nulls), and zero server upload.