Console Syntax In Node

In Node.js, The console module provides a simple debugging console that is similar to the one in web browsers.

It allows developers to print messages to the console for debugging purposes.

The console module is a global object in Node.js, and we can use its various methods to log "information", "warnings", "errors", and more.

Console Syntax Use Cases in Node:

Debugging: Use console.log() to print variables, objects, arrays or other data in the console while code is executing on a server to understand the flow of our code, identify issues and later fix those issues.
Logging: we can use some common console methods in `node.js` such as `console.log()`, `console.info()`, and `console.warn()` to log messages at different levels of severity for monitoring and troubleshooting purposes.
Error Handling: for error handling we can use console.error() to print error messages and stack traces when exceptions occur in our code.
Performance Monitoring: we have `console.time()` and `console.timeEnd()` to measure the execution time of certain parts of our code to identify performance bottlenecks. it helps to identify how much time a block of code takes while executing.
Data Visualization: we can use `console.dir()` and `console.table()` to print complex data structures and tabular data in a more readable format.

Console methods in Node:

console.log():

Prints to stdout with a newline. This method is used for general-purpose logging.

Example:

const greetingMessage = 'Hello world, Node.js!';
console.log("Greeting Message: ", greetingMessage);

console.error():

Prints to stderr with a newline. Used for logging error messages.

Example:

const customErrorMessage = 'This is an error message.';
console.error("Error Message: ", customErrorMessage);

console.warn();

Prints to stderr with a newline. Used for logging warning messages.

Example:

const warningMessage = 'This ia an warning message.';
console.warn('Warning message: ', warningMessage);

console.info();

Prints to stdout with a newline. Used for logging informational messages.

Example:

const infoMessage = 'This ia an informational message.';
console.info('Info message:', infoMessage );

console.time() and console.timeEnd():

console.time: Starts a timer with a label and console.timeEnd: Stops the timer specified by the label and prints the time taken by a block of code.

Example:

console.time('timer');
for (let i = 0; i < 10; i++) {
  // perform some task
}
console.timeEnd('timer'); // Outputs timer: 0.012ms

Note:

The console module is a powerful tool for debugging and logging information during the development of our Node.js applications.

We can use these methods to output information to the terminal where our Node.js application is running.

<-- Server Setup Example

Node REPL -->