class definitions from sample JSON, complete with JSDoc type comments so even untyped JavaScript projects can enjoy editor autocomplete and static analysis. It suits legacy projects that cannot adopt TypeScript, Node.js CLI tools and browser extensions.convert sample api json to js object offline
Convert sample api json to js object offline. This tool handles this and related scenarios — including json to node.js express model class online and json to javascript class with private fields — entirely in your browser with no signup or file upload.
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Overview
The JSON → JavaScript Class generator produces ES6
How to Use This Tool
Step 1 — paste sample JSON on the left, or click "Sample" to load an example. Step 2 — fill in the root class name (default
RootObject). Step 3 — the right editor produces ES6 class code live: the constructor takes a plain object and copies properties onto the instance, and JSDoc @typedef or @property annotations at the top declare field types. Step 4 — copy the code or download it as a .js file. Nested objects are split into multiple classes automatically and array element shapes are merged.Common Use Cases
Node.js back-end projects generate response models when integrating with third-party APIs; Vue / React front-ends add type hints for business objects without adopting TypeScript; Electron apps wrap IPC protocols; Chrome extensions declare storage structures; Firebase / MongoDB documents can be turned into object-oriented entities for easier manipulation.
Technical Details
Primitives map to
string / number / boolean, arrays become Type[], and null becomes * (JSDoc’s any). Class names use PascalCase while field names keep the original JSON spelling and support quoted keys. Generated classes only contain data fields and the constructor — no business methods; add a toJSON() method manually when needed. JSDoc comments are recognised by VS Code, WebStorm and other major IDEs for smart hints and diagnostics.Privacy & Security
Class generation runs entirely in your browser. The JSON you enter is never uploaded, so it is safe to use with production API responses.