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features/json_patch/index.html
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features/json_patch/index.md
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## Patches
JSON Patch ([RFC 6902](https://tools.ietf.org/html/rfc6902)) defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. With the `patch` function, a JSON Patch is applied to the current JSON value by executing all operations from the patch.
JSON Patch ([RFC 6902](https://tools.ietf.org/html/rfc6902)) defines a JSON document structure for expressing a sequence of operations to apply to a JSON document. Operations address locations in the document using [JSON Pointer](https://json.nlohmann.me/features/json_pointer/index.md) paths. With the [`patch`](https://json.nlohmann.me/api/basic_json/patch/index.md) function, a JSON Patch is applied to the current JSON value by executing all operations from the patch, yielding the patched document as a new value.
Example
Applying a patch without copying
[`patch`](https://json.nlohmann.me/api/basic_json/patch/index.md) leaves the original value unchanged and returns the patched result as a copy. If the document is large and the original value is no longer needed, [`patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md) applies the same operations in place instead.
Example: apply a JSON Patch
The following code shows how a JSON patch is applied to a value.
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## Diff
The library can also calculate a JSON patch (i.e., a **diff**) given two JSON values.
The library can also calculate a JSON patch (i.e., a **diff**) given two JSON values with the [`diff`](https://json.nlohmann.me/api/basic_json/diff/index.md) function.
```
flowchart LR
S["source"] -->|"diff(source, target)"| P["patch"]
S -->|"source.patch(patch)"| T["target"]
P -.->|"applied to source, yields"| T
```
Invariant
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source.patch(diff(source, target)) == target;
```
Example
Example: create a JSON Patch from the difference of two values
The following code shows how a JSON patch is created as a diff for two JSON values.
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]
}
```
## See also
- [JSON Pointer](https://json.nlohmann.me/features/json_pointer/index.md) - the addressing scheme used for patch paths
- [JSON Merge Patch](https://json.nlohmann.me/features/merge_patch/index.md) - a simpler, less expressive alternative patch format
- [`patch`](https://json.nlohmann.me/api/basic_json/patch/index.md) - apply a JSON Patch, returning the result as a copy
- [`patch_inplace`](https://json.nlohmann.me/api/basic_json/patch_inplace/index.md) - apply a JSON Patch without copying
- [`diff`](https://json.nlohmann.me/api/basic_json/diff/index.md) - compute a JSON Patch from two values