envscan vs Node.js .env Tools
envscan scans your source code to auto-discover environment variables — then generates .env.example and validates before deploy. Here's how it differs from the tools you're already using.
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dotenv
dotenv loads .env at runtime. envscan auto-generates the .env.example that keeps your team in sync — they work well together.
See full comparison →dotenv-safe
dotenv-safe validates against a manually-maintained .env.example. envscan generates that file from your source code, so it can't go out of sync.
See full comparison →envalid
envalid uses a TypeScript schema you write to validate env vars. envscan reads your source code to discover them — no schema to declare or maintain.
See full comparison →The key difference
Most env var tools (dotenv, dotenv-safe, envalid) require you to tell them which variables your app needs. envscan reads your source code to discover them automatically. The .env.example is generated from what it finds — not from a list you maintain.
Quick answer
| Tool | Use it if… | Add envscan if… |
|---|---|---|
| dotenv | Loading .env at runtime (use it regardless) | You want .env.example generated automatically |
| dotenv-safe | You validate against a maintained .env.example | You want that .env.example auto-generated |
| envalid | You want TypeScript types + coercion for env vars | You want zero-config source-code discovery |
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envscan is in development. Join the waitlist to get notified at launch.
From the team behind textlens — 96/week npm downloads.
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