JSON Cluster
JSON → TypeScript Converter
Infer clean, accurate TypeScript interfaces and types directly from JSON samples. Resolves nested object trees, union arrays, and nullable primitives.
● LOCAL
● NO NETWORK
● TYPESCRIPT 5.x SYNTAX
Need to validate your JSON against a formal schema contract? Open JSON Schema Validator or format invalid JSON in JSON Formatter.
About this tool
What it does
Recursively parses a JSON document and infers idiomatic TypeScript types and interfaces. Automatically generates distinct sub-interfaces for nested objects, derives union types for heterogeneous array members, and accounts for null values.
No data leaves your browser. Generation is executed entirely locally in memory. Input is not persisted.
Target SyntaxTypeScript 4.x / 5.x
Inference ScopeStructural AST inference with sub-interface separation
Network transferNone
Limitations
- Inference is strictly based on the observed sample data. Properties missing in the sample cannot be anticipated as optional.
- Arrays with 0 elements will be typed as
unknown[]due to lack of sample instances.