Node.js console.log() Function - GeeksforGeeks (2024)

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Last Updated : 14 Oct, 2021

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Difference between console.dir and console.log Console Object: The Console object provides access to the browser's debugging console, which can be seen using F12 or ctrl+shift+j. Console object contains many methods, log() and dir() are most used among. The console.log() method prints out a toString representation of the object in the console to the user. Syntax: console.log(object) or console. 2 min read Difference between process.stdout.write and console.log in Node JS Both process.stdout.write and console.log in Node JS have basic functionality to display messages on the console. Basically console.log implement process.stdout.write while process.stdout.write is a buffer/stream that will directly output in our console. Difference between process.stdout.write and console.log in Node JS are:Sr. no.process.stdout.wr 2 min read What is the use of the console.log() Function in JavaScript? The console.log() function serves as a fundamental tool for developers to output information to the console. It plays a crucial role in the debugging process, allowing programmers to inspect variables, log messages, and trace the flow of their code. By printing relevant data to the console, developers can gain insights into the state of their progr 1 min read Difference Between console.time and console.timeEnd in JavaScript In JavaScript, console.time and console.timeEnd are powerful tools used for performance measurement. These methods allow developers to measure the time a block of code takes to execute, which is particularly useful for optimizing performance and debugging. Table of Content What is console. time?What is console.timeEnd?Difference Between console.tim 2 min read How to use console.log() for multiple variables In JavaScript, console.log() is a method that is used to print values or output any message to the console of the browser. To view the console of the browser we press F12 keyboard key shortcut in the browser. This method is mainly used by developers for testing or debugging purpose. In this article we will discuss various methods to display multipl 2 min read Difference Between alert and console.log in JavaScript In JavaScript, alert and console.log are two commonly used methods for the displaying information to the user or the developer. While both the serve the purpose of the outputting data they have different use cases and characteristics. This article explores the differences between the alert and console.log. In this article we are going to discuss th 3 min read HTML DOM console log() Method The console.log() method in HTML is used for writing a message in the console. It indicates an important message during the testing of any program. The message is sent as a parameter to the console.log() method. Syntaxconsole.log( message )ParametersParameter Description message It is mandatory and used to specify the information to be written on 2 min read JavaScript console.log() Method The console.log() method in JavaScript logs messages or data to the console. The console.log() method is useful for debugging or testing purposes. Syntax:console.log("");Parameters: Any message either number, string, array object, etc. Return value: It returns the value of the parameter given. Using Console.log()Using the console.log() to print a s 2 min read Node.js console.warn() Function The console.warn() function from console class of Node.js is used to display the warning messages on the console. It prints to stderr with newline. Note: This function is an alias of console.error() function. Syntax: console.warn( [data][, ...args] ) Parameter: This function can contains multiple parameters. The first parameter is used for the prim 1 min read Node.js console.error() Function The console.error() function from the console class of Node.js is used to display an error message on the console. It prints to stderr with a newline. Syntax: console.error([data][, ...args]) Parameter: This function can contain multiple parameters. The first parameter is used for the primary message and other parameters are used for substitution v 1 min read Node.js console.dir() Method The console.dir() method is used to get the list of object properties of a specified object. These object properties also have child objects, from which you can inspect for further information. Syntax: console.dir( object ) Parameters: This method accepts single parameter which holds the object element. Example 1: <!DOCTYPE html> <html> 1 min read Node.js console.timeEnd() Method The console.timeEnd() method is the console class of Node.js. This method stops a timer that was previously started by using console.time() method and display the result using stdout. Syntax: console.timeEnd( label ) Parameter: This method accepts a single parameter label that holds the string value. If the label is not passed i.e the value of the 2 min read Node.js console.time() Method The console.time() method is the console class of Node.js. It is used to starts a timer that is used to compute the time taken by a piece of code or function. The method console.timeEnd() is used to stop the timer and output the elapsed time in milliseconds to stdout. The timer can be accurate to the sub-millisecond. Syntax console.time( label ) Pa 3 min read Node.js console.clear() Method The console.clear() method is used to clear the stdout, when stdout is a TTY (Teletype) i.e. terminal it will attempt to clear the TTY. When stdout is not a TTY, this method does nothing. The console.clear() will work differently across different operating systems and terminal types. For Linux operating systems, console.clear() operates like the cl 1 min read How to configure node.js console font ? You can format the console font in Node.js using the CHALK module. The chalk module is can be used to customize node console. By using it, one can change the console look using features of it like bold the text, making underlines, highlighting the background color of a text, etc. Features of Chalk module: It's easy to get started and easy to use.It 2 min read Node.js console.assert() Method The console.assert() method is an inbuilt application programming interface of the console module which is used to assert value passed to it as a parameter, i.e. it checks whether the value is true or not, and prints an error message, if provided and failed to assert the value. Syntax: console.assert(value, messages) Parameters: This method has two 2 min read Node.js console.count() Method The console.count() method is an inbuilt application programming interface of the console module which is used to count label passed to it as a parameter, by maintaining an internal counter for that specific label. Syntax: console.count(label) Parameters: This method has one parameter as mentioned above and described below: label: It is an optional 2 min read Node.js console.timeLog() Method The console.timeLog() method is an inbuilt function in Nodejs that is used to display the time for each execution. This function is proved to be effective when used in a loop. Syntax: console.log([label][, ...data]) Parameters: This function accepts two or more parameters. Return Value: This method displays the time for the execution. Below example 1 min read Node.js console.countReset() Method The console.countReset() method is an inbuilt application programming interface of the console module which is used to reset the count for the specific label passed to it as a parameter. Syntax: console.countReset( label ); Parameters: This method has one parameter as mentioned above and described below: label: It is an optional parameter that spec 2 min read Node.js console.trace() Method The console.trace() method is an inbuilt application programming interface of the console module which is used to print stack trace messages to stderr in a newline. Similar to console.error() method. Syntax: console.trace(message, args); Parameters: This method has two parameters as mentioned above and described below: message: This parameter speci 2 min read Node.js console.debug() Method The console.debug() method is an inbuilt application programming interface of the console module which is used to print messages to stdout in a newline. Similar to the console.log() method. Syntax: console.debug(data, args); Parameters: This method has two parameters as mentioned above and described below: data: This parameter specifies the data to 2 min read Node.js console.info() Method The console.info() method is an inbuilt application programming interface of the console module which is used to print messages to stdout in a newline. It is similar to the console.log() method. Syntax: console.info(data, args); Parameters: This method has two parameters as mentioned above and described below: data: This parameter specifies the dat 2 min read Node.js console.table() Method The console.table() method is an inbuilt application programming interface of the console module which is used to print the table constructed from it's parameters into the console. Syntax: console.table(data, properties); Parameters: This method accept two parameters as mentioned above and described below: data: Tabular data. An array of each row d 2 min read Node.js new Console() Method The console module provides a simple debugging console that is provided by web browsers which export two specific components: A Console class that can be used to write to any Node.js stream. Example: console.log(), console.error(), etc.A global console that can be used without importing console. Example: process.stdout, process.stderr, etc. The new 4 min read Node.js console.profileEnd() Method The console module provides a simple debugging console that is provided by web browsers which export two specific components: The console class can be used to write to any Node.js stream. Example: console.log(), console.error(), etc.A global console can be used without importing a console. Example: process.stdout, process.stderr, etc. The console.p 2 min read Node.js console.profile() Method The console module provides a simple debugging console that is provided by web browsers which export two specific components: A Console class that can be used to write to any Node.js stream. Example: console.log(), console.error(), etc.A global console that can be used without importing the console. Example: process.stdout, process.stderr, etc. The 2 min read Node.js console.timeStamp() Method The console module provides a simple debugging console that is provided by web browsers which export two specific components: A Console class that can be used to write to any Node.js stream. Example: console.log(), console.error(), etc.A global console that can be used without importing the console. Example: process.stdout, process.stderr, etc. The 2 min read Node.js console.group() Method The console. group() method is an inbuilt application programming interface of the console module which is used to print passed content in a grouped style. It indicates the start of a message group. To end this group we can use console. groupEnd() method. Syntax: console.group([label]); Parameters: This method accepts only one parameter as mentione 3 min read Node.js console.groupEnd() Method The console. groupEnd() method is an inbuilt application programming interface of the console module which is used to end the started group by calling method console.group() or console.groupCollapsed(). It indicates the end of a message group. Syntax: console.groupEnd(); Parameters: This method doesn't accept any parameter. Return Value: This metho 3 min read Node.js console.groupCollapsed() Method The console.groupCollapsed() method is inbuilt of the console module which is used to collapse the grouped content until call the console.groupEnd() method. It starts the collapsed group and can be ended with groupEnd() method. Syntax: console.groupCollapsed([label]); Parameters: This method accepts only one parameter as mentioned above and describ 2 min read

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