npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2026 – Pkg Stats / Ryan Hefner

@anhuijie/envguard

v1.3.0

Published

Environment variable & config validation, security scanning, and documentation generator for modern projects

Downloads

437

Readme

🛡️ EnvGuard

Environment Variable Validation, Security Scanning & Documentation Generator

CI npm version License: MIT Node.js >=18

English · 中文 · 日本語


🇬🇧 English

Why EnvGuard?

Misconfigured environment variables are a leading cause of production incidents. EnvGuard provides a single tool to validate, secure, and document your project's configuration — catching errors before they reach production.

Features

  • Schema Validation — Define types, required fields, enums, ranges, and patterns for every variable
  • Security Scanning — Detect accidentally committed secrets (AWS keys, GitHub tokens, private keys, etc.)
  • Log Redaction — Automatically redact sensitive values in .env files and log output
  • Framework Templates — One-command config generation for Next.js, Express, Django, Rails, and more
  • Auto Documentation — Generate .env.example and markdown docs from your schema
  • Environment Diff — Compare .env files across dev/staging/prod to find drift
  • CI/CD Ready — Exit codes and GitHub Action integration for automated checks
  • Zero Dependencies — Pure Node.js, no external packages required
  • Multi-format Support — Works with .env, .env.local, .env.production, and more

Quick Start

# Install
npm install -g @anhuijie/envguard

# Create config
envguard init

# Validate environment variables
envguard validate

# Scan for secrets
envguard check

# Generate documentation
envguard docs

# Compare environments
envguard diff .env.development .env.production

# Redact sensitive values
envguard redact
envguard redact --output .env.redacted

# List available framework templates
envguard template list

# Apply a framework template
envguard template apply nextjs

# Merge template into existing config
envguard template apply express --merge

Configuration

Create envguard.config.js in your project root:

module.exports = {
  schema: {
    NODE_ENV: {
      required: true,
      type: 'string',
      enum: ['development', 'staging', 'production', 'test'],
      description: 'Application environment',
    },
    PORT: {
      required: false,
      type: 'port',
      default: '3000',
      description: 'Server port',
    },
    DATABASE_URL: {
      required: true,
      type: 'url',
      description: 'Database connection string',
    },
    JWT_SECRET: {
      required: true,
      type: 'string',
      description: 'Secret key for JWT signing',
    },
  },
  security: {
    minSeverity: 'medium',
    ignoreKeys: [],
  },
};

Supported Types

| Type | Description | Example | |------|-------------|---------| | string | Any string value | any text | | number | Numeric value with optional min/max | 42 | | boolean | true/false, 1/0, yes/no | true | | url | Valid URL | https://example.com | | email | Valid email address | [email protected] | | port | Valid port number (0-65535) | 3000 | | json | Valid JSON string | '{"key":"value"}' | | regex | Valid regex pattern | ^\\d+$ | | date | ISO 8601 date string | 2024-01-15 | | semver | Semantic version | 1.2.3 | | color | CSS color (hex, rgb, named) | #ff6600 |

Rule Options

| Option | Type | Description | |--------|------|-------------| | required | boolean | Variable must be set | | type | string | Value type validation | | default | any | Default value if not set | | enum | array | Allowed values | | min / max | number | Range constraints (for number type) | | pattern | string | Regex pattern the value must match | | deprecated | boolean | Mark as deprecated | | replacement | string | Suggested replacement for deprecated vars | | description | string | Human-readable description |

Security Scanning

EnvGuard detects these secret types:

  • AWS Access Keys & Secret Keys
  • GitHub / GitLab Tokens
  • Slack Tokens
  • Stripe Live Keys
  • Private Keys (RSA, EC, DSA)
  • JWT Secrets
  • Database URLs with embedded passwords
  • Generic API Keys, Passwords, and Secrets

Log Redaction

Redact sensitive values before sharing .env files or log output:

# Redact .env file values (shows which keys are redacted)
envguard redact

# Write redacted file to disk
envguard redact --output .env.redacted

# Redact a text string (e.g. log message)
envguard redact --text "Connected as admin:[email protected]"

# Custom redaction mask
envguard redact --mask "[REDACTED]"

# Skip specific keys
envguard redact --ignore-keys "NODE_ENV,APP_NAME"

Programmatic API:

const { redactObject, redactString, createRedactionMiddleware } = require('@anhuijie/envguard');

// Redact an object
const safe = redactObject(process.env);
// { API_KEY: '***', DATABASE_URL: '***', PORT: '3000' }

// Redact a string
const safeLog = redactString('User logged in with token=ghp_abc123');
// 'User logged in with token=***'

// Create middleware for logging libraries
const middleware = createRedactionMiddleware({ mask: '[HIDDEN]' });
console.log(middleware('JWT_SECRET=abc123'));
// 'JWT_SECRET=[HIDDEN]'

Framework Templates

Generate project-specific configuration from built-in templates:

# List all available templates
envguard template list

# Apply a template (creates envguard.config.js)
envguard template apply nextjs
envguard template apply express
envguard template apply django
envguard template apply rails
envguard template apply docker-compose
envguard template apply serverless

# Merge template into existing config
envguard template apply express --merge

# Overwrite existing config
envguard template apply nextjs --force

Available templates:

| Template | Description | Variables | |----------|-------------|-----------| | nextjs | Next.js full-stack application | 11 vars (5 required) | | express | Express.js REST API server | 12 vars (3 required) | | django | Django Python web application | 16 vars (4 required) | | rails | Ruby on Rails web application | 18 vars (3 required) | | docker-compose | Docker Compose multi-container setup | 18 vars (1 required) | | serverless | Serverless Framework AWS Lambda | 20 vars (2 required) |

CI/CD Integration

GitHub Actions:

- name: Validate env config
  run: npx @anhuijie/envguard validate

- name: Security check
  run: npx @anhuijie/envguard check

The command exits with code 1 on validation errors or critical security findings, failing the build.

Programmatic API

const { validateEnv, scanForSecrets, generateEnvExample, redactObject, redactString } = require('@anhuijie/envguard');

const schema = { PORT: { required: true, type: 'port' } };
const result = validateEnv(process.env, schema);
// { valid: true, errors: [], warnings: [], checked: 1 }

const secrets = scanForSecrets(process.env);
// { findings: [], hasCritical: false, total: 0 }

const example = generateEnvExample(schema);
// "# Server port\n# type: port\nPORT=\n"

const safeEnv = redactObject(process.env);
// { API_KEY: '***', PORT: '3000' }

License

MIT


🇨🇳 中文

为什么需要 EnvGuard?

环境变量配置错误是生产事故的主要原因之一。EnvGuard 提供一站式工具来验证、保护和文档化项目配置——在错误到达生产环境之前就将其捕获。

功能特性

  • Schema 验证 — 为每个变量定义类型、必填、枚举、范围和正则模式
  • 安全扫描 — 检测意外提交的密钥(AWS 密钥、GitHub Token、私钥等)
  • 自动文档 — 从 Schema 生成 .env.example 和 Markdown 文档
  • 环境对比 — 比较 dev/staging/prod 的 .env 文件差异
  • CI/CD 就绪 — 退出码和 GitHub Action 集成,支持自动化检查
  • 零依赖 — 纯 Node.js 实现,无需外部包
  • 多格式支持 — 支持 .env.env.local.env.production

快速开始

# 安装
npm install -g @anhuijie/envguard

# 创建配置
envguard init

# 验证环境变量
envguard validate

# 扫描敏感信息
envguard check

# 生成文档
envguard docs

# 对比环境差异
envguard diff .env.development .env.production

配置

在项目根目录创建 envguard.config.js

module.exports = {
  schema: {
    NODE_ENV: {
      required: true,
      type: 'string',
      enum: ['development', 'staging', 'production', 'test'],
      description: '应用运行环境',
    },
    PORT: {
      required: false,
      type: 'port',
      default: '3000',
      description: '服务端口',
    },
    DATABASE_URL: {
      required: true,
      type: 'url',
      description: '数据库连接字符串',
    },
    JWT_SECRET: {
      required: true,
      type: 'string',
      description: 'JWT 签名密钥',
    },
  },
  security: {
    minSeverity: 'medium',
    ignoreKeys: [],
  },
};

支持的类型

| 类型 | 说明 | 示例 | |------|------|------| | string | 任意字符串 | 任意文本 | | number | 数值,支持 min/max | 42 | | boolean | true/false、1/0、yes/no | true | | url | 合法 URL | https://example.com | | email | 合法邮箱 | [email protected] | | port | 合法端口号 (0-65535) | 3000 | | json | 合法 JSON 字符串 | '{"key":"value"}' | | regex | 合法正则表达式 | ^\\d+$ | | date | ISO 8601 日期字符串 | 2024-01-15 | | semver | 语义化版本号 | 1.2.3 | | color | CSS 颜色(hex、rgb、命名色) | #ff6600 |

安全扫描

EnvGuard 可检测以下密钥类型:

  • AWS 访问密钥和密钥
  • GitHub / GitLab Token
  • Slack Token
  • Stripe Live Key
  • 私钥(RSA、EC、DSA)
  • JWT 密钥
  • 包含密码的数据库连接 URL
  • 通用 API Key、密码和密钥

CI/CD 集成

GitHub Actions:

- name: 验证环境配置
  run: npx @anhuijie/envguard validate

- name: 安全检查
  run: npx @anhuijie/envguard check

验证失败或发现严重安全问题时,命令以退出码 1 退出,使构建失败。

编程式 API

const { validateEnv, scanForSecrets, generateEnvExample, redactObject, redactString } = require('@anhuijie/envguard');

const schema = { PORT: { required: true, type: 'port' } };
const result = validateEnv(process.env, schema);
// { valid: true, errors: [], warnings: [], checked: 1 }

const secrets = scanForSecrets(process.env);
// { findings: [], hasCritical: false, total: 0 }

const example = generateEnvExample(schema);
// "# Server port\n# type: port\nPORT=\n"

const safeEnv = redactObject(process.env);
// { API_KEY: '***', PORT: '3000' }

许可证

MIT


🇯🇵 日本語

なぜ EnvGuard が必要か?

環境変数の設定ミスは本番障害の主要な原因の一つです。EnvGuard は、プロジェクトの設定を検証・保護・文書化するオールインワンツールを提供し、エラーが本番環境に到達する前に検出します。

機能

  • スキーマ検証 — 各変数の型、必須、列挙、範囲、正規表現パターンを定義
  • セキュリティスキャン — 誤ってコミットされたシークレットの検出(AWS キー、GitHub トークン、秘密鍵など)
  • 自動ドキュメント生成 — スキーマから .env.example と Markdown ドキュメントを生成
  • 環境比較 — dev/staging/prod の .env ファイルの差分を検出
  • CI/CD 対応 — 終了コードと GitHub Action 統合による自動チェック
  • ゼロ依存 — 外部パッケージ不要のピュア Node.js 実装
  • マルチフォーマット対応.env.env.local.env.production などに対応

クイックスタート

# インストール
npm install -g @anhuijie/envguard

# 設定ファイルの作成
envguard init

# 環境変数の検証
envguard validate

# セキュリティスキャン
envguard check

# ドキュメント生成
envguard docs

# 環境の比較
envguard diff .env.development .env.production

設定

プロジェクトルートに envguard.config.js を作成:

module.exports = {
  schema: {
    NODE_ENV: {
      required: true,
      type: 'string',
      enum: ['development', 'staging', 'production', 'test'],
      description: 'アプリケーション環境',
    },
    PORT: {
      required: false,
      type: 'port',
      default: '3000',
      description: 'サーバーポート',
    },
    DATABASE_URL: {
      required: true,
      type: 'url',
      description: 'データベース接続文字列',
    },
    JWT_SECRET: {
      required: true,
      type: 'string',
      description: 'JWT 署名用シークレットキー',
    },
  },
  security: {
    minSeverity: 'medium',
    ignoreKeys: [],
  },
};

サポート型

| 型 | 説明 | 例 | |----|------|-----| | string | 任意の文字列 | 任意のテキスト | | number | 数値(min/max 対応) | 42 | | boolean | true/false、1/0、yes/no | true | | url | 有効な URL | https://example.com | | email | 有効なメールアドレス | [email protected] | | port | 有効なポート番号 (0-65535) | 3000 | | json | 有効な JSON 文字列 | '{"key":"value"}' | | regex | 有効な正規表現パターン | ^\\d+$ | | date | ISO 8601 日付文字列 | 2024-01-15 | | semver | セマンティックバージョン | 1.2.3 | | color | CSS カラー(hex、rgb、名前付き) | #ff6600 |

セキュリティスキャン

EnvGuard は以下のシークレットタイプを検出します:

  • AWS アクセスキー・シークレットキー
  • GitHub / GitLab トークン
  • Slack トークン
  • Stripe ライブキー
  • 秘密鍵(RSA、EC、DSA)
  • JWT シークレット
  • パスワード埋め込みデータベース URL
  • 汎用 API キー、パスワード、シークレット

CI/CD 統合

GitHub Actions:

- name: 環境設定の検証
  run: npx @anhuijie/envguard validate

- name: セキュリティチェック
  run: npx @anhuijie/envguard check

検証エラーや重大なセキュリティ問題が見つかった場合、コマンドは終了コード 1 で終了し、ビルドを失敗させます。

プログラマティック API

const { validateEnv, scanForSecrets, generateEnvExample, redactObject, redactString } = require('@anhuijie/envguard');

const schema = { PORT: { required: true, type: 'port' } };
const result = validateEnv(process.env, schema);
// { valid: true, errors: [], warnings: [], checked: 1 }

const secrets = scanForSecrets(process.env);
// { findings: [], hasCritical: false, total: 0 }

const example = generateEnvExample(schema);
// "# Server port\n# type: port\nPORT=\n"

const safeEnv = redactObject(process.env);
// { API_KEY: '***', PORT: '3000' }

ライセンス

MIT