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One JSON sample, thirteen code targets
JSON to Code Generator
Convert JSON locally into typed models for Go, TypeScript, Java, Rust, Swift, Python and seven more languages.
JSON and generated code stay in this browserJSON
JSON input
Paste a JSON object or array. Press Ctrl/Command + Enter to generate.
Go
Generated model
Review nullability, dates, numeric ranges and library annotations before using the result in production.
01 / LANGUAGES
Thirteen practical output formats
Each target follows its usual model style, including JSON tags or serialization annotations where the language supports them.
02 / INFERENCE
How the type inference works
The generator reads the values in your sample. It does not know the full API contract, so ambiguous fields remain conservative.
Primitive types
Strings, booleans, integers and decimals map to the closest native type in the selected language. Mixed numeric arrays widen to decimals.
Nested objects and arrays
Nested objects become named models. Object arrays are inspected across all sample items so their fields can be merged.
Missing and null values
Fields missing from some array items become optional. A null-only value stays an unknown nullable type because JSON does not reveal its intended type.
Field names and JSON keys
Identifiers are adapted to each language. JSON tags, annotations, coding keys or comments retain the original key when a name changes.
03 / USE CASES
Where this generator saves time
Build models from API responses
Paste a representative response and create the first version of request, response or persistence models without retyping every field.
Share one shape across platforms
Use the same JSON sample to start backend, web, Android, iOS and desktop models while keeping field coverage easy to compare.
Compare language type systems
See how the same nested data is expressed as a Go struct, TypeScript interface, Rust struct, Swift Codable model or Python dataclass.
Create typed models from a representative JSON sample
The generator recognizes primitives, nested objects, arrays, missing fields and null values, then writes idiomatic starter models for thirteen popular languages without sending the input to a server.
Paste, choose a language, name the root and review
Paste valid JSON, select a target, set a root type name and generate. Copy the result or download a source file, then verify inferred types and serialization details against the real API contract.
Method and sources
The browser's JSON.parse validates the input. A local schema walker merges object-array fields, widens compatible numbers and marks missing or null values, then language-specific generators produce code in memory. Focused tests cover all thirteen targets and nested edge cases.
Frequently asked questions
What can JSON to Code Generator do?
The generator recognizes primitives, nested objects, arrays, missing fields and null values, then writes idiomatic starter models for thirteen popular languages without sending the input to a server.
How do I use JSON to Code Generator?
Paste valid JSON, select a target, set a root type name and generate. Copy the result or download a source file, then verify inferred types and serialization details against the real API contract.
Does JSON to Code Generator upload my data?
Parsing and code generation run in local JavaScript. The JSON and generated source are not sent to Zituo Tools; copying and downloading happen from the current browser.