Environment configuration in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to load environment variables in a microservice.

Microservices

const config = process.env.[1];

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ANODE_ENV

BCONFIG_PATH

CPORT

DSERVICE_NAME

Attempts:

3 left

💡 Hint

Common Mistakes

Using a variable that defines port or service name instead of environment.

The NODE_ENV variable is commonly used to determine the environment (development, production, etc.) in microservices.

2fill in blank

medium

Complete the code to read a configuration file path from environment variables.

Microservices

const configPath = process.env.[1] || './config/default.json';

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ACONFIG_FILE

BCONFIG_PATH

CCONFIG_DIR

DCONFIG_LOCATION

Attempts:

3 left

💡 Hint

Common Mistakes

Using variable names that do not clearly indicate a file path.

CONFIG_PATH is a common environment variable name used to specify the path to a configuration file.

3fill in blank

hard

Fix the error in the code to correctly parse environment variables for service port.

Microservices

const port = parseInt(process.env.[1], 10) || 3000;

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APORT

BAPP_PORT

CSERVICE_PORT

DPORT_NUMBER

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-standard or custom variable names that may not be recognized by hosting platforms.

PORT is the standard environment variable name for service port in microservices.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that filters environment variables starting with 'APP_'.

Microservices

const appEnvVars = Object.fromEntries(Object.entries(process.env).filter(([key, value]) => key.[1]('APP_') === [2]));

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AstartsWith

BindexOf

C0

D-1

Attempts:

3 left

💡 Hint

Common Mistakes

Using indexOf without comparing to 0, or using -1 incorrectly.

Use indexOf('APP_') === 0 which returns true if the key starts with 'APP_'. indexOf returns 0 if the substring starts at the beginning of the string. Alternatively, startsWith('APP_') returns a boolean directly.

5fill in blank

hard

Fill all three blanks to create a function that loads environment variables with defaults.

Microservices

function getEnvVar(name, defaultValue) {
  return process.env[[1]] ?? [2] ?? [3];
}

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Aname

BdefaultValue

C''

Dnull

Attempts:

3 left

💡 Hint

Common Mistakes

Using null as the last fallback instead of an empty string, which may cause issues when expecting strings.

The function returns the environment variable by name. If undefined, it returns defaultValue. If that is also undefined or null, it returns an empty string '' as a fallback.