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JSDoc is a markup language for adding inline API documentation to JavaScript source code. This is distinct from the various tools that parse and manipulate code that follows the JSDoc syntax.

The JSDoc markup language is similar to the Javadoc syntax, used for documenting Java code, but is specialized to work with JavaScript's more dynamic syntax and therefore unique, as it is not completely compatible with Javadoc. However, like Javadoc, JSDoc allows the programmer to create doclets and tags which can then be translated into published output, like HTML or RTF.

Example:

/**
    Represents a book.
    @constructor
    @param {string} title - The title of the book.
    @param {string} author - The author of the book.
 */
function Book(title, author) {
}

The following annotations are commonly used in modern JSDoc, but the full list varies between implementations:

@param Documents a method parameter; a datatype indicator can be added between curly braces
@return Documents a return value
@constructor Marks a function as a constructor
@deprecated Marks a method as deprecated
@private Signifies that a method is private
@requires Describe a required resource.
@this Specifies the type of the object to which the keyword "this" refers within a function.
@throws Documents an exception thrown by a method
@exception Synonym for @throws
@author Developer's name
@version Provides the version number of a library