Diff JSON and JSON-like structures in Python
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README.rst

jsondiff

Diff JSON and JSON-like structures in Python.

Installation

pip install jsondiff

Quickstart

>>> from jsondiff import diff

>>> diff({'a': 1, 'b': 2}, {'b': 3, 'c': 4})
{'c': 4, 'b': 3, delete: ['a']}

>>> diff(['a', 'b', 'c'], ['a', 'b', 'c', 'd'])
{insert: [(3, 'd')]}

>>> diff(['a', 'b', 'c'], ['a', 'c'])
{delete: [1]}

# Typical diff looks like what you'd expect...
>>> diff({'a': [0, {'b': 4}, 1]}, {'a': [0, {'b': 5}, 1]})
{'a': {1: {'b': 5}}}

# ...but similarity is taken into account
>>> diff({'a': [0, {'b': 4}, 1]}, {'a': [0, {'c': 5}, 1]})
{'a': {insert: [(1, {'c': 5})], delete: [1]}}

# Support for various diff syntaxes
>>> diff({'a': 1, 'b': 2}, {'b': 3, 'c': 4}, syntax='explicit')
{insert: {'c': 4}, update: {'b': 3}, delete: ['a']}

>>> diff({'a': 1, 'b': 2}, {'b': 3, 'c': 4}, syntax='symmetric')
{insert: {'c': 4}, 'b': [2, 3], delete: {'a': 1}}

# Special handling of sets
>>> diff({'a', 'b', 'c'}, {'a', 'c', 'd'})
{discard: set(['b']), add: set(['d'])}

# Load and dump JSON
>>> print diff('["a", "b", "c"]', '["a", "c", "d"]', load=True, dump=True)
{"$delete": [1], "$insert": [[2, "d"]]}

Command Line Client

Usage:

jsondiff [-h] [-p] [-s SYNTAX] [-i INDENT] first second

positional arguments:
  first
  second

optional arguments:
  -h, --help            show this help message and exit
  -p, --patch
  -s SYNTAX, --syntax SYNTAX
  -i INDENT, --indent INDENT

Examples:

$ jsondiff a.json b.json -i 2

$ jsondiff a.json b.json -i 2 -s symmetric