json_diff

Description:

json diff

Generate a diff between two JSON strings.
Usage #
Here's a basic example which features a deleted object, a new object, a changed
object, and a deeply changed object:
import 'package:json_diff/json_diff.dart';

final left = {"a": 2, "b": 3, "c": 5, "d": {"x": 4, "y": 8}};
final right = {"b": 7, "c": 5, "d": {"x": 4, "z": 16}, "e": 11};
final differ = JsonDiffer.fromJson(left, right);
DiffNode diff = differ.diff();
print(diff.added); // => {"e": 11}
print(diff.removed); // => {"a": 2}
print(diff.changed); // => {"b": [3, 7]}
print(diff.node); // => a Map<String,DiffNode>
print(diff.node['d']); // => a DiffNode
print(diff.node['d'].added); // => {"z": 16}
print(diff.node['d'].removed); // => {"y": 8}
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So that's pretty fun. So when you diff two JSON strings, you get back a
DiffNode. A DiffNode is a heirarchical structure that vaguely mirrors the
structure of the input JSON strings. In this example, the top-level DiffNode we
got back has

an added property, which is a Map of top-level properties that
were not found in left, and were found in right.
a removed property, which is a Map of top-level properties that were found
in left, but were not found in right.
a changed property, which is a Map of top-level properties whose values are
different in left and in right. The values in this Map are two-element
Arrays. The 0th element is the old value (from left), and the 1st element
is the new value (from right).
a moved property, which is a Map of indexes, where key is the original index
of an element, and value is index in the changed list.
a node property, a Map of the properties found in both left and right
that have deep differences. The values of this Map are more DiffNodes.
a path property, which is a List of indexes, describing the path from the root
where this DiffNode is operating.

Contributing #
Contributions welcome! Please read the
contribution guidelines.
Disclaimer #
This is not an official Google product.