---
id: json-delta
version: "2.0.2"
license: BSD
license_treatment: permissive
maintenance: abandoned
---

# json-delta — A diff/patch pair for JSON-serialized data structures.

License: permissive · Maintenance: abandoned · Downloads: 599.3K/mo

## What it is and what it does

json-delta is a Python library for computing and applying deltas (diffs) between JSON data structures. It reduces communication overhead by transmitting only the changes between two versions of a JSON object rather than the entire updated structure. The package provides both a Python API and command-line tools (json_diff, json_patch, json_cat) for working with JSON deltas.

The library was designed for scenarios where two programs—such as a client and server communicating over HTTP, or two processes using IPC—need to synchronize shared data structures while minimizing bandwidth. It has zero runtime dependencies and installs as a pure-Python wheel, making deployment straightforward. However, the package has been abandoned since 2020-10-18 with no maintenance activity, meaning it receives no bug fixes, security updates, or compatibility improvements for newer Python versions.

Use it for:

- Reduce bandwidth in client-server JSON synchronization by transmitting only deltas instead of full payloads.
- Minimize data transfer in bidirectional IPC between processes that share evolving JSON data structures.
- Compress JSON change logs or audit trails by storing deltas rather than complete snapshots.
- Implement efficient real-time collaboration features where multiple clients modify shared JSON documents.
- Generate human-readable diffs of JSON configuration or data files for version control or debugging.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Computes and applies diffs/patches between JSON data structures to minimize communication overhead when synchronizing data across processes or network channels.

Yes, if you need JSON diff/patch functionality and can tolerate an unmaintained package. The zero-dependency installation and permissive BSD license make it low-risk to adopt, but verify compatibility with your Python version and test thoroughly before production use. Consider alternatives if you require active maintenance or support for modern Python versions.

## Install

pip install json-delta
uv add json-delta
poetry add json-delta

## Installing json-delta

Before you install: Installation is frictionless—a pure-Python wheel with no runtime dependencies—but the package is abandoned as of 2020-10-18 with no maintenance activity since then. Use only if you accept the risk of unpatched bugs and no forward compatibility.

License in practice: BSD permissive license allows commercial and private use with minimal restrictions, making it suitable for most projects that can tolerate an unmaintained codebase.

Quickstart:

pip install json-delta

import json_delta

old = {"a": 1, "b": 2}
new = {"a": 1, "b": 3, "c": 4}
delta = json_delta.diff(old, new)
result = json_delta.patch(old, delta)

Verify before relying:

- Whether the package works correctly on modern Python versions beyond 3.4.
- Whether the command-line tools (json_diff, json_patch, json_cat) are still functional.
- Performance characteristics and delta compression efficiency compared to alternatives.

## Package facts

- License: BSD (permissive)
- Python support: unspecified
- Install friction: low
- Maintenance: abandoned
- Downloads: 599.3K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

json diff patch, json delta compression, json data synchronization, minimize json transmission, json change detection, json serialization delta, efficient json updates, json-processing, data-synchronization, abandoned

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