René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"`process.env` is missing environment variables with numeric names","articleBody":"### Version\n\n25.2.1, 24.11.1\n\n### Platform\n\n```text\nWindows 11: Microsoft Windows NT 10.0.28000.0 x64\nUbuntu 24: Linux 6.6.87.1-microsoft-standard-WSL2 #1 SMP PREEMPT_DYNAMIC Mon Apr 21 17:08:54 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\n1. Set an environment variable with a numeric name.\n2. Run node.\n3. Check in `process.env` for that environment variable.\n\nFor example, in a Windows Command Prompt:\n```\necho console.log(process.env['386']);console.log(process.env['OTHER']); \u003e test.js\nset 386=1\nset OTHER=1\nnode test.js\n```\n\nProduces:\n```\nundefined\n1\n```\n\nI'm not 100% sure how to set such env vars in bash, but it does repro using PowerShell in Ubuntu:\n```\nPS\u003e $env:OTHER=1\nPS\u003e $env:386=1\nPS\u003e node test.js\nundefined\n1\n```\n\n### How often does it reproduce? Is there a required condition?\n\n100% repro.\n\n### What is the expected behavior? Why is that the expected behavior?\n\nThe environment variable should be present in `process.env` - a numeric name is valid and can be set once in Node.\n\n### What do you see instead?\n\nThe environment variable is missing.\n\n### Additional information\n\n_No response_","author":{"url":"https://github.com/dpaoliello","@type":"Person","name":"dpaoliello"},"datePublished":"2025-11-20T17:56:43.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/60795/node/issues/60795"}