The @param tag provides the name, type, and description of a function parameter.
The @param tag requires you to specify the name of the parameter you are documenting. You can also include the parameter's type, enclosed in
curly brackets, and a description of the parameter.
JSDoc namepath to another symbol in your code. If you have written documentation for the symbol at that namepath, JSDoc
will automatically link to the documentation for that symbol. You can also use a type expression to indicate, for example, that a parameter is not nullable
or can accept any type; see the [@type tag documentation][tags-type] for details.
If you provide a description, you can make the JSDoc comment more readable by inserting a hyphen before the description. Be sure to include a space before and
after the hyphen.
Names, types, and descriptions
The following examples show how to include names, types, and descriptions in a @param tag.
You can add a hyphen before the description to make it more readable. Be sure to include a space before and after the hyphen.
Parameters with properties
If a parameter is expected to have a specific property, you can document that property by providing an additional @param tag. For example, if an
employee parameter is expected to have name and
department properties, you can document it as follows:
You can also combine this syntax with JSDoc's syntax for array parameters. For example, if multiple employees can be assigned to a project:
Optional parameters and default values
The following examples show how to indicate that a parameter is optional and has a default value.
Multiple types and repeatable parameters
The following examples show how to use type expressions to indicate that a parameter can accept multiple types (or any type), and that a parameter can be provided
more than once. See the
@type tag documentation for details about the type expressions that JSDoc supports.
If a parameter accepts a callback function, you can use the @callback tag to define a callback type, then include
the callback type in the @param tag.