JSON to JSDoc Converter
Convert JSON to JSDoc @typedef comments instantly. Infer @property types from nested objects, arrays, and nullable fields. Free online tool, 100% in-browser.
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What is JSON to JSDoc Converter?
The JSON to JSDoc Converter turns a JSON sample into a JSDoc @typedef comment block. Every field becomes a @property tag with its inferred type, nested objects become dotted paths, and arrays document their element types. It is the fastest way to document API responses in plain JavaScript projects.
Key Benefits
- Autocomplete and type hints in VS Code without a build step
- Documentation that stays in sync with real API data
- Nullable and mixed-type fields surfaced automatically
- No data leaves your browser — safe for internal APIs
- Copy-paste output that works in JS, JSDoc, and docs pipelines
Common Use Cases
- •Document a REST API response shape before writing client code
- •Add type hints to a legacy JavaScript codebase incrementally
- •Generate reference docs for config files and webhook payloads
- •Onboard teammates by sharing typedefs instead of screenshots
- •Prepare JavaScript for gradual TypeScript adoption via checkJs
How to Convert JSON to JSDoc
- Input: Paste a JSON object, or an array of objects, into the input area.
- Configure: Set the typedef name, add an optional description, and toggle the example tag.
- Generate: The JSDoc block regenerates automatically as you type or change options.
- Export: Copy the block to your clipboard or download it as a file.
Key Features
- Generate JSDoc @typedef blocks from any JSON sample
- Nested @property tags with dotted paths for deep objects
- Array element type detection and multi-sample merging
- Nullable and mixed-type field flags inferred from data
- Custom type name, description, and optional @example tag
- One-click copy or download with live preview
Frequently Asked Questions
What is a JSDoc typedef?
A typedef is a comment block that describes the shape of an object. Editors and documentation generators read the @property tags to provide autocompletion, type hints, and API docs for plain JavaScript.
How are nested objects and arrays handled?
Nested objects emit dotted @property paths such as profile.bio, and arrays report their merged element types. When you paste an array of objects, all element shapes are merged into one typedef.
Can I use the output in TypeScript projects?
Yes, JSDoc comments work in TypeScript-checked JavaScript and in declaration files, though TypeScript projects often prefer dedicated type declarations. The block is most valuable in plain JavaScript codebases.
Does this tool send my JSON anywhere?
No. Parsing and generation happen entirely in your browser. No sample data is uploaded, stored, or logged.