How to convert a string to snake case using JavaScript ? Last Updated : 21 May, 2024 Comments Improve Suggest changes Like Article Like Report In this article, we are given a string in and the task is to write a JavaScript code to convert the given string into a snake case and print the modified string. Examples: Input: GeeksForGeeks Output: geeks_for_geeks Input: CamelCaseToSnakeCase Output: camel_case_to_snake_caseThere are some common approaches: Table of Content Using match(), map(), join(), and toLowerCase() Using for loopUsing Lodash _.snakeCase() methodUsing match(), map(), join(), and toLowerCase() We use the match(), map(), join(), and toLowerCase() methods to convert a given string into a snake case string. The match() method is used to match the given string with the pattern and then use map() and toLowerCase() methods to convert the given string into lower case and then use join() method to join the string using underscore (_). Example: This example shows the use of the above-explained approach. JavaScript function snake_case_string(str) { return str && str.match( /[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g) .map(s => s.toLowerCase()) .join('_'); } console.log(snake_case_string('GeeksForGeeks')); console.log(snake_case_string('Welcome to GeeksForGeeks')); console.log(snake_case_string('Welcome-to-GeeksForGeeks')); console.log(snake_case_string('Welcome_to_GeeksForGeeks')); Outputgeeks_for_geeks welcome_to_geeks_for_geeks welcome_to_geeks_for_geeks welcome_to_geeks_for_geeks Using for loopIn this approach first we initialize empty string to store snake string then we Iterate over each character of the input string and check if the current character is uppercase and not the first character of the string. If so, we will add an underscore ('_') before appending the lowercase version of thwill contain the snake case string. Example: below example uses above explained approach. JavaScript function toSnakeCase(str) { let snakeCase = ''; for (let i = 0; i < str.length; i++) { const char = str[i]; if (char.toUpperCase() === char && i > 0) { snakeCase += '_'; } snakeCase += char.toLowerCase(); } return snakeCase; } console.log(toSnakeCase("welcomeToGeeksForGeeks")); Outputwelcome_to_geeks_for_geeks Using Lodash _.snakeCase() methodLodash _.snakeCase() method is used to convert the given string into a snake case string. Example: below example uses _.snakeCase() method to convert a string to snake case. JavaScript const _ = require('lodash'); let myString = 'GeeksForGeeks'; let snakeCaseString = _.snakeCase(myString); console.log(snakeCaseString); Output: geeks_for_geeks Comment More infoAdvertise with us Next Article How to convert a string to snake case using JavaScript ? 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