{"library":"mashumaro","title":"mashumaro","description":"mashumaro is a fast and well-tested serialization library built on top of Python dataclasses. It provides efficient conversion of dataclass instances to and from various formats like JSON, YAML, TOML, MessagePack, and plain dictionaries. It is actively maintained with frequent releases, currently at version 3.20.","language":"python","status":"active","last_verified":"Tue May 12","install":{"commands":["pip install mashumaro","pip install mashumaro[orjson]"],"cli":null},"imports":["from mashumaro.mixins.json import DataClassJSONMixin","from mashumaro import DataClassDictMixin","from mashumaro.jsonschema import build_json_schema"],"auth":{"required":false,"env_vars":[]},"quickstart":{"code":"from dataclasses import dataclass\nfrom mashumaro.mixins.json import DataClassJSONMixin\n\n@dataclass\nclass User(DataClassJSONMixin):\n    name: str\n    email: str\n    age: int\n\n# Serialize to JSON\nuser = User(name='Alice', email='alice@example.com', age=30)\njson_str = user.to_json()\nprint(f\"Serialized: {json_str}\")\n\n# Deserialize from JSON\nrestored_user = User.from_json(json_str)\nprint(f\"Deserialized: {restored_user}\")\nassert restored_user == user","lang":"python","description":"Define a dataclass inheriting from `DataClassJSONMixin` to automatically gain `to_json()` and `from_json()` methods for seamless JSON serialization and deserialization.","tag":null,"tag_description":null,"last_tested":"2026-04-24","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":"3.20","pypi_latest":"3.21","is_stale":true,"summary":{"python_range":"3.10–3.9","success_rate":100,"avg_install_s":1.9,"avg_import_s":0.13,"wheel_type":"wheel"},"results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.12,"mem_mb":4.2,"disk_size":"18.9M"},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.13,"mem_mb":4.2,"disk_size":"18.9M"},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.11,"mem_mb":4.2,"disk_size":"19.3M"},{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.13,"mem_mb":4.2,"disk_size":"19.3M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.6,"import_time_s":0.09,"mem_mb":4.2,"disk_size":"19M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.08,"mem_mb":4.2,"disk_size":"19M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.2,"import_time_s":0.09,"mem_mb":4.2,"disk_size":"20M"},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.08,"mem_mb":4.2,"disk_size":"20M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.17,"mem_mb":4.4,"disk_size":"21.0M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.2,"mem_mb":4.4,"disk_size":"21.0M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.17,"mem_mb":4.4,"disk_size":"21.4M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.2,"mem_mb":4.4,"disk_size":"21.4M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.7,"import_time_s":0.16,"mem_mb":4.4,"disk_size":"21M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.4,"disk_size":"21M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2,"import_time_s":0.15,"mem_mb":4.4,"disk_size":"22M"},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.14,"mem_mb":4.4,"disk_size":"22M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"12.8M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"12.8M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.14,"mem_mb":4.3,"disk_size":"13.2M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"13.2M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.5,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"13M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"13M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.8,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"14M"},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.3,"disk_size":"14M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"12.5M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"12.4M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.13,"mem_mb":4.5,"disk_size":"12.9M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"12.8M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.6,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"13M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.15,"mem_mb":4.5,"disk_size":"13M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.8,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"13M"},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.14,"mem_mb":4.5,"disk_size":"13M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.11,"mem_mb":4.1,"disk_size":"18.4M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.12,"mem_mb":4.1,"disk_size":"18.4M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":null,"import_time_s":0.11,"mem_mb":4.1,"disk_size":"18.7M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.12,"mem_mb":4.1,"disk_size":"18.7M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":1.9,"import_time_s":0.1,"mem_mb":4.1,"disk_size":"19M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"mashumaro","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.1,"mem_mb":4.1,"disk_size":"19M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.5,"import_time_s":0.1,"mem_mb":4.1,"disk_size":"19M"},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"orjson","exit_code":0,"wheel_type":null,"failure_reason":null,"import_side_effects":null,"install_time_s":null,"import_time_s":0.1,"mem_mb":4.1,"disk_size":"19M"}]}}