Node.js CLI Environment & Config

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Node.js CLI environment and config cheat sheets for NODE_OPTIONS, runtime environment variables, proxy settings, CA certificates, and launch patterns.

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Environment Variables and NODE_OPTIONS

Control runtime behavior from shell env vars.

Preload with NODE_OPTIONS

Apply CLI flags through the environment.

↗#

bashANYnodeenvnode_options

bash

NODE_OPTIONS="--require dotenv/config" node app.js

Useful in CI, Docker, and shell profiles. Command-line flags still win.

Run with NODE_ENV=production

Set common production mode.

↗#

bashANYnodeenvproduction

bash

NODE_ENV=production node app.js

Frequently used by frameworks and libraries to alter runtime behavior.

Suppress warnings

Disable warning output.

↗#

bashANYnodewarnings

bash

NODE_NO_WARNINGS=1 node app.js

Use sparingly because it can hide useful diagnostics.

Set timezone

Run process in a chosen timezone.

↗#

bashANYnodetimezone

bash

TZ=UTC node app.js

Helpful in tests, cron jobs, and reproducible scripts.

Set libuv threadpool size

Tune worker threadpool size.

↗#

bashANYnodeperformancelibuv

bash

UV_THREADPOOL_SIZE=16 node app.js

Can matter for fs, crypto, and other libuv-backed async work.

Add extra CA certificates

Trust additional certificate authorities.

↗#

bashANYnodetlsca

bash

NODE_EXTRA_CA_CERTS=./internal-ca.pem node app.js

Useful in enterprise environments with internal PKI.

Honor HTTP proxy env vars

Tell Node to use HTTP_PROXY and related vars.

↗#

bashANYnodeproxy

bash

NODE_USE_ENV_PROXY=1 node app.js

Useful in corporate proxy environments and CI jobs.

Use system CA store

Load trusted CA certs from the OS store.

↗#

bashANYnodetlssystem-ca

bash

NODE_USE_SYSTEM_CA=1 node app.js

Helpful when relying on system-managed certificates.

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