{"library":"stpyv8","title":"Python Wrapper for Google V8 Engine","type":"library","description":"STPyV8 is a Python wrapper for the Google V8 JavaScript engine, enabling seamless interoperability between Python 3 and JavaScript. It serves as a modern fork of the original PyV8 project, continuously updated by Cloudflare to align with the latest Google V8 engine branches and Python 3 versions. The library receives frequent updates, often coinciding with new V8 releases, and provides pre-built wheels for various platforms.","language":"python","status":"active","last_verified":"Fri May 22","install":{"commands":["pip install stpyv8"],"cli":null},"imports":["import STPyV8","from STPyV8 import JSContext","from STPyV8 import JSClass"],"auth":{"required":false,"env_vars":[]},"links":{"homepage":null,"github":"https://github.com/cloudflare/stpyv8","docs":null,"changelog":null,"pypi":"https://pypi.org/project/stpyv8/","npm":null,"openapi_spec":null,"status_page":null,"smithery":null},"quickstart":{"code":"import STPyV8\n\nwith STPyV8.JSContext() as ctxt:\n    result = ctxt.eval(\"'Hello, ' + 'STPyV8!'\");\n    print(result)\n\n# Exporting a Python function to JavaScript\nclass MyFunctions(STPyV8.JSClass):\n    def multiply(self, a, b):\n        return a * b\n\nmy_funcs = MyFunctions()\nwith STPyV8.JSContext(my_funcs) as ctxt:\n    js_code = \"this.multiply(5, 3);\"\n    multiplication_result = ctxt.eval(js_code)\n    print(f\"Multiplication result: {multiplication_result}\")","lang":"python","description":"This example demonstrates how to initialize a V8 JavaScript context, evaluate a simple JavaScript expression, and export a Python class method to be callable from within the JavaScript context.","tag":null,"tag_description":null,"last_tested":null,"results":[]},"compatibility":{"tag":null,"tag_description":null,"last_tested":"2026-05-22","installed_version":"13.1.201.22","pypi_latest":"13.1.201.22","is_stale":false,"summary":{"python_range":"3.10–3.9","success_rate":50,"avg_install_s":2.4,"avg_import_s":0.12,"wheel_type":"wheel"},"results":[{"runtime":"python:3.10-alpine","python_version":"3.10","os_libc":"alpine (musl)","variant":"stpyv8","exit_code":1,"wheel_type":null,"failure_reason":"build_error","import_side_effects":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.10-slim","python_version":"3.10","os_libc":"slim (glibc)","variant":"stpyv8","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.3,"import_time_s":0.08,"mem_mb":12.4,"disk_size":"118M"},{"runtime":"python:3.11-alpine","python_version":"3.11","os_libc":"alpine (musl)","variant":"stpyv8","exit_code":1,"wheel_type":null,"failure_reason":"build_error","import_side_effects":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.11-slim","python_version":"3.11","os_libc":"slim (glibc)","variant":"stpyv8","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.3,"import_time_s":0.12,"mem_mb":12.7,"disk_size":"120M"},{"runtime":"python:3.12-alpine","python_version":"3.12","os_libc":"alpine (musl)","variant":"stpyv8","exit_code":1,"wheel_type":null,"failure_reason":"build_error","import_side_effects":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.12-slim","python_version":"3.12","os_libc":"slim (glibc)","variant":"stpyv8","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.1,"import_time_s":0.17,"mem_mb":13.3,"disk_size":"112M"},{"runtime":"python:3.13-alpine","python_version":"3.13","os_libc":"alpine (musl)","variant":"stpyv8","exit_code":1,"wheel_type":null,"failure_reason":"build_error","import_side_effects":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.13-slim","python_version":"3.13","os_libc":"slim (glibc)","variant":"stpyv8","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.3,"import_time_s":0.12,"mem_mb":13.1,"disk_size":"111M"},{"runtime":"python:3.9-alpine","python_version":"3.9","os_libc":"alpine (musl)","variant":"stpyv8","exit_code":1,"wheel_type":null,"failure_reason":"build_error","import_side_effects":null,"install_time_s":null,"import_time_s":null,"mem_mb":null,"disk_size":null},{"runtime":"python:3.9-slim","python_version":"3.9","os_libc":"slim (glibc)","variant":"stpyv8","exit_code":0,"wheel_type":"wheel","failure_reason":null,"import_side_effects":"clean","install_time_s":2.9,"import_time_s":0.13,"mem_mb":13.1,"disk_size":"118M"}]}}