Yashotantra Academy logo
← Node.js theorytheory 0/50 · 0%
level 1
Curious · 0 XP
streak
0d
perfect
0
badges
0

100 XP to Apprentice

Foundations · easy

7. process and environment

Reading configuration and exiting cleanly.

1 min read3 questionsup to 50 XPtopic 7/50

Read in another language

AI translates the explanation and quiz text while preserving code and answer scoring.

The global `process` object exposes the running program: `process.argv` (CLI arguments), `process.env` (environment variables), `process.exit(code)`, and `process.on("SIGINT", ...)` for signal handling.

js
const rpcUrl = process.env.RPC_URL ?? "https://mainnet.base.org";
const [, , command] = process.argv; // argv[0]=node, argv[1]=script path

process.on("SIGINT", () => {
  console.log("shutting down gracefully");
  process.exit(0);
});

Configuration (API keys, RPC endpoints, database URLs) should live in environment variables, not hard-coded in source — this is how the same code runs against testnet and mainnet, and it keeps secrets out of git history.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

Scoring

  • · Up to 30 XP from quiz accuracy.
  • · +15 XP for a perfect first attempt.
  • · +5 XP while a 3-day streak is running.
  • · 75% or higher marks the topic complete.

Check your understanding

  1. 1. Where should an RPC endpoint or API key typically live?

  2. 2. What does `process.argv[0]` typically contain?

  3. 3. What does `process.exit(0)` signal?

Badges

First light
Pass your first topic
Sharp shooter
3 perfect first-try quizzes
On a roll
Study 3 days in a row
Week warrior
Study 7 days in a row
Grinder
Earn 500 XP
Deep diver
Earn 1500 XP