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api/basic_json/is_binary/index.md

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+# nlohmann::basic_json::is_binary
+
+```
+constexpr bool is_binary() const noexcept;
+```
+
+This function returns `true` if and only if the JSON value is a binary array.
+
+## Return value
+
+`true` if type is binary, `false` otherwise.
+
+## Exception safety
+
+No-throw guarantee: this member function never throws exceptions.
+
+## Complexity
+
+Constant.
+
+## Examples
+
+Example
+
+The following code exemplifies `is_binary()` for all JSON types.
+
+```
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create JSON values
+    json j_null;
+    json j_boolean = true;
+    json j_number_integer = 17;
+    json j_number_unsigned_integer = 12345678987654321u;
+    json j_number_float = 23.42;
+    json j_object = {{"one", 1}, {"two", 2}};
+    json j_array = {1, 2, 4, 8, 16};
+    json j_string = "Hello, world";
+    json j_binary = json::binary({1, 2, 3});
+
+    // call is_binary()
+    std::cout << std::boolalpha;
+    std::cout << j_null.is_binary() << '\n';
+    std::cout << j_boolean.is_binary() << '\n';
+    std::cout << j_number_integer.is_binary() << '\n';
+    std::cout << j_number_unsigned_integer.is_binary() << '\n';
+    std::cout << j_number_float.is_binary() << '\n';
+    std::cout << j_object.is_binary() << '\n';
+    std::cout << j_array.is_binary() << '\n';
+    std::cout << j_string.is_binary() << '\n';
+    std::cout << j_binary.is_binary() << '\n';
+}
+```
+
+Output:
+
+```
+false
+false
+false
+false
+false
+false
+false
+false
+true
+```
+
+## Version history
+
+- Added in version 3.8.0.