Envgrd – Detect environment variable drift using AST analysis

Hacker News

I built a small CLI to solve a problem that repeatedly caused production issues on my teams: environment variable drift. Things like: Code starts using a new env var but configs aren’t updated Old variables sit in .env or docker-compose long after they’ve been removed Onboarding fails because required env vars aren’t documented anywhere CI/CD passes locally but fails remotely because variables were exported only on one machine Regex-based scanners always produced tons of false positives and couldn’t handle dynamic patterns. So I built envgrd, a fast, AST-based scanner that uses Tree-Sitter to parse code (JS/TS, Go, Python, Rust, Java) and compare it against env sources: .env files, direnv, docker-compose, Kubernetes ConfigMaps/Secrets, systemd units, and shell exports. It reports: Missing env vars (used in code but not in configs) Unused env vars (in configs but never referenced in code) Dynamic patterns like process.env["prefix_" + var] or os.Getenv(key + "_suffix") It runs in parallel, supports JSON output, and can be hooked into post-merge or CI jobs. Repo: https://github.com/njenia/envgrd Would love feedback, ideas, or any edge cases you think it should handle!

Visit product View on Hacker NewsNov 26, 2025

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