jsdoc
Write and maintain JSDoc comments for JavaScript and TypeScript APIs: functions, classes, modules, parameters, returns, examples, and TODO annotations. Use when documenting code, generating API docs, setting JSDoc conventions, or when the user mentions JSDoc tags like @param, @returns, or @todo.
What this skill does
# JSDoc
## Overview
JSDoc is a documentation generator for JavaScript. You write documentation comments directly above code, and JSDoc parses those comments to generate API documentation.
**Core principle**: Document the public API clearly and keep comments colocated with code so docs stay accurate as implementation changes.
---
## Comment rules
- JSDoc blocks must start with `/**` (exactly two stars after the slash).
- Blocks that start with `/*`, `/***`, or more stars are ignored by the JSDoc parser.
- Place the comment immediately before the symbol being documented (function, class, method, module, etc.).
- Prefer documenting public and reusable APIs first.
---
## Quick start
```js
/**
* Adds two numbers.
* @param {number} a - First number.
* @param {number} b - Second number.
* @returns {number} Sum of the two numbers.
*/
function add(a, b) {
return a + b;
}
```
---
## Core tags
| Tag | Use |
|-----|-----|
| `@param {Type} name - description` | Document function parameters |
| `@returns {Type} description` | Document return value |
| `@constructor` | Mark a function as a constructor |
| `@todo text` | Track pending tasks in docs |
Use additional tags as needed for your project (`@example`, `@throws`, `@deprecated`, `@see`, etc.).
---
## Common documentation patterns
### Functions
```js
/**
* Formats a user's full name.
* @param {string} firstName - User first name.
* @param {string} lastName - User last name.
* @returns {string} The formatted full name.
*/
function formatName(firstName, lastName) {
return `${firstName} ${lastName}`;
}
```
### Constructor-style functions
```js
/**
* Represents a book.
* @constructor
* @param {string} title - Book title.
* @param {string} author - Book author.
*/
function Book(title, author) {
this.title = title;
this.author = author;
}
```
### TODO annotations
```js
/**
* @todo Implement pagination support.
* @todo Add validation for empty input.
*/
function listItems() {}
```
---
## Generate documentation
Basic CLI usage:
```bash
jsdoc book.js
```
This generates HTML docs in an `out/` directory by default.
You can also pass multiple source files:
```bash
/path/to/jsdoc src/a.js src/b.js
```
You may provide a config file for CLI options and template customization.
---
## Best practices
- Keep descriptions short, specific, and focused on behavior.
- Document parameter and return types consistently.
- Include `@todo` for known gaps that must be tracked.
- Update comments whenever API signatures change.
- Document exported/public modules first, then internal helpers as needed.
- Keep examples executable and realistic.
---
## Common mistakes
- Using `/* ... */` instead of `/** ... */` for JSDoc blocks.
- Writing comments far from the symbol they describe.
- Missing `@param` entries for function inputs.
- Describing implementation details instead of API behavior.
- Letting comments drift from current code after refactors.
---
## Additional resources
- [reference.md](reference.md) — Official JSDoc docs links for quick lookup.
- **Official docs**: https://jsdoc.app
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