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### jsoncons::basic_json::merge
```cpp
void merge(const basic_json& source); (1)
void merge(basic_json&& source); (2)
void merge(object_iterator hint, const basic_json& source); (3)
void merge(object_iterator hint, basic_json&& source); (4)
```
Copies the key-value pairs in source json object into json object. If there is a member in source json object with key equivalent to the key of a member in json object,
then that member is not copied.
The `merge` function performs only a one-level-deep shallow merge, not a deep merge of nested objects.
#### Parameters
<table>
<tr>
<td><code>source</code></td>
<td>`json` object value</td>
</tr>
</table>
#### Return value
None
#### Exceptions
Throws `std::domain_error` if source or *this are not json objects.
### Examples
#### Merge `json`
```cpp
json j = json::parse(R"(
{
"a" : 1,
"b" : 2
}
)");
const json source = json::parse(R"(
{
"a" : 2,
"c" : 3
}
)");
j1.merge(source);
std::cout << j << endl;
```
Output:
```json
{"a":1,"b":2,"c":3}
```
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