# adobe/S3Mock

A mock implementation of the AWS S3 API startable as Docker image, TestContainer, JUnit Jupiter extension or TestNG listener

Repository: https://github.com/adobe/S3Mock
Canonical: https://ross.abutalabs.com/products/s3mock
Language: Kotlin
License: Apache-2.0
License Family: permissive
Topics: s3, mock, testing, docker, junit, aws-s3, aws, testcontainers, arm64, amd64, java, kotlin
Last push: 2026-08-24T20:48:03+00:00

## Health v2 (maintenance only)
Score: 99/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 99, longevity 100
- inputs: {"age_days": 3332, "days_push": 9, "days_rel": 11, "gap_med": 18, "n_releases_24m": 22}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 1134, forks 198 (observed 2026-08-28T04:03:43.066372+00:00)

## What it is
S3Mock is a lightweight server that implements a subset of the Amazon S3 API for local integration testing, removing the need for real AWS infrastructure. It can be started as a Docker image, Testcontainer, JUnit Jupiter extension, or TestNG listener.

## Use cases
- test S3-dependent code locally without AWS
- run S3 mock in integration tests with Testcontainers
- start a fake S3 endpoint for JUnit tests
- develop against S3 API offline
- test S3 uploads and downloads with AWS CLI
- mock S3 for CI pipelines

## When to choose
- you need a local S3-compatible endpoint for automated tests
- you want to avoid AWS costs and network dependency in CI
- you use Java/Kotlin with JUnit or Testcontainers

## When to avoid
- you need full S3 API coverage or production parity
- you need real S3 features like cross-region replication or IAM policies
- you need a persistent production object store

## Facets
- artifact type: service
- maturity: active
- function: mocking, testing, http-server
- domain: testing, developer-tools, cloud-computing, apis
- platform: jvm, self-hosted
- tags: aws-s3, s3-api, testcontainers, junit-extension, integration-testing, local-development, docker

## Member repositories
- adobe/S3Mock (main) score 99

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:03:43.066372+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T06:36:53.866732+00:00, confidence not recorded.
  - readme: https://github.com/adobe/S3Mock (fetched 2026-08-28T04:03:43.066372+00:00, sha 3144714788f7)
- Data as of 2026-08-30T08:39:29.467469+00:00.