# JSON Merge Patch

The library supports JSON Merge Patch ([RFC 7386](https://tools.ietf.org/html/rfc7386)) as a patch format.
The merge patch format is primarily intended for use with the HTTP PATCH method as a means of describing a set of modifications to a target resource's content. This function applies a merge patch to the current JSON value.

Instead of using [JSON Pointer](json_pointer.md) to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.

??? example

    The following code shows how a JSON Merge Patch is applied to a JSON document.

    ```cpp
    --8<-- "examples/merge_patch.cpp"
    ```
    
    Output:

    ```json
    --8<-- "examples/merge_patch.output"
    ```