JSON to Classes Generator

Why a generator

When an interface responds in JSON, sooner or later that JSON has to be read by a program: a class in C#, an interface in TypeScript, a dataclass in Python. Writing them by hand is mechanical and treacherous, because the mistake is never in the structure — which you copy — but in the details: a property whose case changes, a field called full_name in the original that would become FullName in your language. A generator does the boring work and does not get distracted.

What is kept and what is adapted

Class and member names follow the conventions of the target language: PascalCase for C#, camelCase for Java fields, snake_case where that is the custom. The original JSON names are never lost: C# annotates them with JsonPropertyName, Java with JsonProperty, Go puts them in the json tags, Python keeps them in the comment next to the field. The result deserializes the original JSON as it is.

Arrays with different elements

It happens that the elements of an array do not all have the same shape: a field exists only in some, or a number is an integer in one element and a decimal in another. The tool merges the elements into a single class: properties present only in some become optional, and types widen to the most general one that contains them all. It is the only honest reconstruction possible when shapes differ.

Your data never leaves the browser

Like every tool on this site, the conversion happens entirely on your own machine. The JSON you paste — which may contain responses from internal systems or customer data — is never sent to a server, never stored and never written to any log.