Generate TypeScript interfaces and types from JSON data with configurable naming and optional/required field detection.
A captured JSON payload can become a set of TypeScript interfaces and type aliases without manually transcribing every property. The converter examines the values and nesting present in the sample, derives corresponding TypeScript shapes, and applies the selected naming and optional-field settings. Conversion occurs entirely in the browser, so the pasted JSON is not uploaded. The important surprise is that the result describes only the evidence in that sample. It cannot infer omitted variants, business constraints, or values that might appear in later payloads.
The converter parses the entered JSON and classifies its observed strings, numbers, booleans, arrays, objects, and null values. Object members become candidate TypeScript properties, while nested objects and array items contribute additional shapes. The returned declarations describe the structure of the data; they do not alter the JSON or create runtime conversion code.
Naming controls determine how generated TypeScript declarations and identifiers are labeled. Optional/required detection uses property presence visible in the supplied records to decide whether a property can be marked with TypeScript's question-mark syntax. That syntax means the property may be absent. It is different from a required property whose value may include null or undefined.
No. Interfaces and type aliases express compile-time expectations for TypeScript tooling, but they do not inspect an incoming payload at runtime. Data from a network, file, storage layer, or user input still needs runtime validation when its correctness is not already guaranteed. The converter produces declarations, not a validator or parser.
No. It can reason only from the records pasted into it. A field that appears in every sample may still be absent in production, and an unseen object variant cannot be inferred. Supply examples covering known variations, use optional/required detection as a draft, and compare the output with the API contract or source schema.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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