# jsonpatch

[![Build Status](https://travis-ci.org/appscode/jsonpatch.svg?branch=master)](https://travis-ci.org/appscode/jsonpatch)
[![Go Report Card](https://goreportcard.com/badge/appscode/jsonpatch "Go Report Card")](https://goreportcard.com/report/appscode/jsonpatch)
[![GoDoc](https://godoc.org/github.com/appscode/jsonpatch?status.svg "GoDoc")](https://godoc.org/github.com/appscode/jsonpatch)

As per http://jsonpatch.com JSON Patch is specified in RFC 6902 from the IETF.

JSON Patch allows you to generate JSON that describes changes you want to make to a document, so you don't have to send the whole doc. JSON Patch format is supported by HTTP PATCH method, allowing for standards based partial updates via REST APIs.

```console
go get github.com/appscode/jsonpatch
```

I tried some of the other "jsonpatch" go implementations, but none of them could diff two json documents and 
generate format like jsonpatch.com specifies. Here's an example of the patch format:

```json
[
  { "op": "replace", "path": "/baz", "value": "boo" },
  { "op": "add", "path": "/hello", "value": ["world"] },
  { "op": "remove", "path": "/foo"}
]

```
The API is super simple

## example

```go
package main

import (
	"fmt"
	"github.com/appscode/jsonpatch"
)

var simpleA = `{"a":100, "b":200, "c":"hello"}`
var simpleB = `{"a":100, "b":200, "c":"goodbye"}`

func main() {
	patch, e := jsonpatch.CreatePatch([]byte(simpleA), []byte(simpleA))
	if e != nil {
		fmt.Printf("Error creating JSON patch:%v", e)
		return
	}
	for _, operation := range patch {
		fmt.Printf("%s\n", operation.Json())
	}
}
```

This code needs more tests, as it's a highly recursive, type-fiddly monster. It's not a lot of code, but it has to deal with a lot of complexity.