moto

A library that allows you to easily mock out tests based on AWS infrastructure

moto Permissive license Apache-2.0 Active ★ 8,613 v5.2.2 released 2026-06-06

Install

moto on PyPI

pip

pip install moto

uv

uv add moto

poetry

poetry add moto

Package facts

License	Apache-2.0 (permissive)
Python support	supports the current Python release (>=3.10)
Install friction	low — pure-Python wheel
Runtime dependencies	7 — boto3, botocore, cryptography, requests, xmltodict, werkzeug, responses
Maintenance	actively maintained — 68 days since the last release
Last repo commit	2026-08-11
First released	2017-05-13
Popularity	one of the top 1,000 most-downloaded packages on PyPI (30-day window, as of 2026-08-13)
Known vulnerabilities	none known (OSV.dev, checked 2026-08-13)

Evidence: moto-5.2.2-py3-none-any.whl

Keywords: aws, ec2, s3, boto3, mock

Programming Language :: Python :: 3Programming Language :: Python :: 3.10Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14Topic :: Software Development :: Testing

About moto

from the package's own PyPI description — quoted content, verbatim

Moto - Mock AWS Services

Join the chat at https://gitter.im/awsmoto/Lobby (image)

Build Status (image) Coverage Status (image) Docs (image) PyPI (image) PyPI - Python Version (image) PyPI - Downloads (image) Code style: Ruff (image) Financial Contributors (image)

Install

$ pip install 'moto[ec2,s3,all]'

In a...

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AI interpretation — verify before relying

AI-generated interpretation of the package facts above; every digit, version, license, or vulnerability id it cites is grounded in the facts already shown on this page

Moto mocks AWS services for testing, allowing you to test code that calls boto3 without hitting real AWS infrastructure. It intercepts boto3 calls and simulates AWS service behavior in memory.

Low friction installation with a pure-Python wheel. Active maintenance (last commit 2026-08-11, 68 days since release) and broad Python 3.10–3.14 support. Seven runtime dependencies are all well-established libraries.

Apache-2.0 is permissive; you may use, modify, and distribute moto freely in commercial and private projects, provided you include a copy of the license and state significant changes.

Usage

pip install moto

import boto3
from moto import mock_aws

@mock_aws
def test_s3():
    s3 = boto3.client('s3', region_name='us-east-1')
    s3.create_bucket(Bucket='test')
    s3.put_object(Bucket='test', Key='file', Body=b'data')
    obj = s3.get_object(Bucket='test', Key='file')
    assert obj['Body'].read() == b'data'

Verdict: Moto is a mature, actively maintained testing library with no known vulnerabilities. It offers low-friction installation and broad Python version support (3.10–3.14). Apache-2.0 licensing is permissive. Ideal for unit and integration testing of AWS-dependent code without external service calls.

Needs verification

Coverage of specific AWS services beyond S3 and EC2 (implementation coverage page referenced but not provided)
Performance characteristics when mocking large-scale or complex AWS operations
Community adoption metrics and real-world usage patterns

mock aws services testingboto3 mocking libraryaws service mockstest aws code locallys3 ec2 mock testingaws infrastructure mocking