Open-Source Security · motdotla

dotenv

dotenv is a lightweight Node.js module that loads environment variables from a .env file into the application's runtime, supporting the Twelve-Factor App methodology for configuration management. It requires zero external dependencies and handles common patterns like multiline values, comments, and basic parsing.

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Source: GitHub — github.com/motdotla/dotenv

20.5k

GitHub stars

949

Forks

JavaScript

Primary language

BSD-2-Clause

License (OSI-approved)

Key facts

Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.

Field	Value
Repository	motdotla/dotenv
Owner	motdotla
Primary language	JavaScript
License	BSD-2-Clause — OSI-approved
Stars	20.5k
Forks	949
Open issues	13
Latest release	Unknown
Last updated	2026-06-11
Source	https://github.com/motdotla/dotenv

What dotenv is

dotenv parses .env files and injects key-value pairs into process.env using require('dotenv').config() or ES6 import syntax. It supports multiline values (v15.0.0+), inline comments, and custom paths, with no external dependencies. The README notes that dotenvx is recommended for variable expansion, command substitution, encryption, and production workflows.

Quickstart

Get the dotenv source

Clone the repository and explore it locally.

terminalbash

1git clone https://github.com/motdotla/dotenv.git2cd dotenv3# follow the project's README for install & configuration

Need it deployed, integrated, or customized instead? DEV.co ships production installs.

Best use cases

Local Development Environment Configuration

Simplifies per-developer setup by externalizing API keys, database URLs, and feature flags from code into a .env file, avoiding accidental secrets commits.

Multi-Environment Management (with dotenvx)

Supports .env.local, .env.production, and environment-specific files; the maintainer recommends dotenvx for encryption and safe version control integration.

Zero-Dependency Secret Injection

Lightweight alternative to larger config libraries when only basic .env parsing is needed; ideal for CLI tools, microservices, and resource-constrained environments.

Implementation considerations

Call require('dotenv').config() as early as possible in application startup (before other module requires) to ensure variables are available throughout the app.
Exclude .env files from version control (.gitignore) to prevent accidental secret exposure; use environment-specific overrides (.env.local) for local development.
For monorepos, place .env in the root of the folder where the app process runs; be aware that require order matters if multiple .env files are used.
Test parsing behavior with multiline values (e.g., private keys) and inline comments; verify that .env format matches the parser's expectations.
Plan a migration path to dotenvx or similar if production encryption, variable expansion, or advanced secret syncing becomes necessary.

When to avoid it — and what to weigh

Encryption or Secure Secret Storage Required — dotenv does not encrypt secrets; .env files are plain text. The maintainer explicitly recommends dotenvx for production encryption and syncing use cases.
Dynamic or Complex Variable Substitution — dotenv does not support variable expansion or command substitution; these features require dotenvx. Complex config templating belongs in a dedicated tool.
Enterprise Multi-Tenant or Compliance-Heavy Deployments — dotenv offers no audit logging, role-based access, or compliance controls. Enterprise secret management (Vault, AWS Secrets Manager) is more appropriate.
Non-Node.js Environments — dotenv is Node.js-specific. Projects using Python, Go, Java, or other languages require language-specific alternatives or a cross-platform tool like dotenvx.

License & commercial use

BSD-2-Clause (BSD 2-Clause Simplified License): permissive open-source license permitting commercial use, modification, and distribution with minimal restrictions (requires license notice and disclaimer).

BSD-2-Clause is a permissive OSI-approved license compatible with commercial use without royalties or restrictions. However, this applies only to dotenv itself; ensure .env file contents (secrets, API keys) are managed appropriately and separately from the licensing obligation.

DEV.co evaluation signals

Editorial assessment — not user reviews. Directional, with an explicit confidence level.

Signal	Assessment
Maintenance	Active
Documentation	Strong
License clarity	Clear
Deployment complexity	Low
DEV.co fit	Strong
Assessment confidence	High

Security considerations

dotenv itself is a parser with no cryptographic or authentication mechanisms. Security depends on: (1) .env files not being committed to version control or exposed in production; (2) proper file permissions on .env files (readable only by app user); (3) production deployments using external secret injection, not .env files; (4) awareness that .env contents are plain text and visible to anyone with filesystem access. No known CVEs or audit history provided in the data; requires external security review if using with sensitive credentials.

Alternatives to consider

dotenvx

Evolution of dotenv by the same maintainer; adds variable expansion, command substitution, encryption, multi-environment management, and production syncing—recommended by the maintainer for non-trivial deployments.

HashiCorp Vault

Enterprise-grade secrets management with encryption, audit logging, role-based access, and multi-language support; suitable for production, compliance-heavy, or multi-tenant environments.

AWS Secrets Manager / Azure Key Vault / Google Secret Manager

Cloud-native secrets storage with rotation, audit trails, and integration into CI/CD pipelines; preferred for cloud-deployed applications requiring compliance and security.

Software development agency

Build on dotenv with DEV.co software developers

Start with npm install dotenv and a simple require('dotenv').config(). For production encryption and advanced features, plan a migration to dotenvx or an enterprise secrets vault.

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Related open-source tools

Surfaced by semantic similarity across the DEV.co open-source index.

dotenvx osv.dev express-typescript

Related on DEV.co

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dotenv FAQ

Should I commit .env files to version control?

No. Commit .env.example (with placeholder values) instead. Add .env to .gitignore. In production, inject secrets via environment variables, container orchestration, or external secrets services.

Does dotenv work in the browser?

No, dotenv is Node.js-only. It requires the filesystem and process.env, neither of which exist in browsers. Use server-side rendering or a backend API to pass config to frontend code.

How do I use dotenv with TypeScript?

Install dotenv and call require('dotenv').config() or import 'dotenv/config' at the top of your entry file. Types are available via npm; process.env is typed by Node.js built-in types.

Can dotenv handle environment-specific configs (dev, staging, prod)?

dotenv can load .env.local, .env.staging, etc., but requires manual logic to choose which file. The maintainer recommends dotenvx for cleaner multi-environment support via -f flag and .env.keys.

Software development & web development with DEV.co

Adopting dotenv is usually one piece of a larger software development effort. As a software development agency, DEV.co provides software development services and web development expertise — pairing senior software developers and web developers with your team to design, build, and operate open-source security software in production.

Ready to implement dotenv?

Start with npm install dotenv and a simple require('dotenv').config(). For production encryption and advanced features, plan a migration to dotenvx or an enterprise secrets vault.

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