Function diff

pub fn diff(left: &Value, right: &Value) -> Patch

Diff two JSON documents and generate a JSON Patch (RFC 6902).

Example

Diff two JSONs:

#[macro_use]
use json_patch::{Patch, patch, diff};
use serde_json::{json, from_value};

let left = json!({
  "title": "Goodbye!",
  "author" : {
    "givenName" : "John",
    "familyName" : "Doe"
  },
  "tags":[ "example", "sample" ],
  "content": "This will be unchanged"
});

let right = json!({
  "title": "Hello!",
  "author" : {
    "givenName" : "John"
  },
  "tags": [ "example" ],
  "content": "This will be unchanged",
  "phoneNumber": "+01-123-456-7890"
});

let p = diff(&left, &right);
assert_eq!(p, from_value::<Patch>(json!([
  { "op": "replace", "path": "/title", "value": "Hello!" },
  { "op": "remove", "path": "/author/familyName" },
  { "op": "remove", "path": "/tags/1" },
  { "op": "add", "path": "/phoneNumber", "value": "+01-123-456-7890" },
])).unwrap());

let mut doc = left.clone();
patch(&mut doc, &p).unwrap();
assert_eq!(doc, right);