{"library":"marshmallow","title":"Marshmallow","description":"Marshmallow is a lightweight library for converting complex datatypes to and from native Python datatypes. The current version is 4.2.3, released on March 28, 2026. It follows a regular release cadence, with updates approximately every few months.","language":"python","status":"active","last_verified":"Tue May 12","install":{"commands":["pip install marshmallow"],"cli":null},"imports":["from marshmallow import Schema","from marshmallow import fields"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"from marshmallow import Schema, fields\n\nclass UserSchema(Schema):\n    name = fields.Str()\n    email = fields.Email()\n    created_at = fields.DateTime()\n\nuser_data = {\n    'name': 'Monty',\n    'email': 'monty@python.org',\n    'created_at': '2014-08-17T14:54:16.049594+00:00'\n}\n\nschema = UserSchema()\nresult = schema.load(user_data)\nprint(result)","lang":"python","description":"A simple example demonstrating how to define a schema and load data using Marshmallow.","tag":"verified","tag_description":"quickstart runs on critical runtimes, recently tested","last_tested":"2026-04-23","results":[{"runtime":"python:3.10-alpine","exit_code":0},{"runtime":"python:3.10-slim","exit_code":0},{"runtime":"python:3.11-alpine","exit_code":0},{"runtime":"python:3.11-slim","exit_code":0},{"runtime":"python:3.12-alpine","exit_code":0},{"runtime":"python:3.12-slim","exit_code":0},{"runtime":"python:3.13-alpine","exit_code":0},{"runtime":"python:3.13-slim","exit_code":0},{"runtime":"python:3.9-alpine","exit_code":0},{"runtime":"python:3.9-slim","exit_code":0}]},"compatibility":{"tag":"verified","tag_description":"installs cleanly on critical runtimes, fast import, recently tested","last_tested":"2026-05-12","installed_version":null,"pypi_latest":null,"is_stale":null,"summary":{"python_range":"3.10–3.9","success_rate":100,"avg_install_s":null,"avg_import_s":0.56,"wheel_type":null},"results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.46,"mem_mb":4.4,"disk_size":"18.7M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.31,"mem_mb":5.1,"disk_size":"19M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.99,"mem_mb":4.1,"disk_size":"20.1M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.81,"mem_mb":4.1,"disk_size":"21M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.7,"mem_mb":4,"disk_size":"11.9M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.73,"mem_mb":4,"disk_size":"12M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.68,"mem_mb":3.2,"disk_size":"11.6M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.67,"mem_mb":3,"disk_size":"12M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.1,"mem_mb":4.5,"disk_size":"18.2M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"marshmallow","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.1,"mem_mb":5,"disk_size":"19M"}]}}