1# <small>nlohmann::basic_json::</small>is_array
2
3```cpp
4constexpr bool is_array() const noexcept;
5```
6
7This function returns `#!cpp true` if and only if the JSON value is an array.
8    
9## Return value
10
11`#!cpp true` if type is an array, `#!cpp false` otherwise.
12
13## Exception safety
14
15No-throw guarantee: this member function never throws exceptions.
16
17## Complexity
18
19Constant.
20
21## Examples
22
23??? example
24
25    The following code exemplifies `is_array()` for all JSON types.
26    
27    ```cpp
28    --8<-- "examples/is_array.cpp"
29    ```
30    
31    Output:
32    
33    ```json
34    --8<-- "examples/is_array.output"
35    ```
36
37## Version history
38
39- Added in version 1.0.0.
40