How to Convert String to Char Code in JavaScript

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To convert a string to char code in JavaScript, you can use the “charCodeAt()” method.

The charCodeAt() method takes an index of characters from the string we want to convert into Unicode.

Syntax

string.charCodeAt(index);

Parameters

Index – It is an index number of our string. By default, it is 0.

Return type

Number:  It will return a Unicode of our character. If our index is not valid, then it will return NaN.

Example

const string = "Wonderful People";

console.log(string.charCodeAt(0));
console.log(string.charCodeAt(5));
console.log(string.charCodeAt(8));
console.log(string.charCodeAt(32));

Output

87
114
108
NaN

In the above example, we pass an index of the string, and the charCodeAt method returns the Unicode of that character. If we don’t give anything inside that, it will return the Unicode of the first character of our string.

Converting string to charCode using map() function

The array map() function creates a new array populated with the results of calling a provided function on every element in the calling array.

const string_to_char_code = ([...string]) => {
   const array = string.map((char) => {
   return char.charCodeAt(0);
 });
 // array of unicode
 return array;
}
console.log(string_to_char_code("Wonderful"));

Output

[87, 111, 110, 100, 101, 114, 102, 117, 108]

In the above example, we convert our whole string to an array of Unicode using a map, which is a simple way to do that.

Let’s do something interesting with that charCodeAt() method. In the below example, we do the sum of all Unicode.

const string_to_char_code = ([...string]) => {
   const array = string.map(char => char.charCodeAt(0));
   const sum = array.reduce((cur, prev) => cur + prev);
   return sum;
}
console.log(string_to_char_code("Wonderful People"));

Output

1595

Converting a Unicode to char code

The String.fromCharCode() method returns a string created from the specified sequence of UTF-16 code units.

Syntax

String.fromCharCode(P1, P2, …);

Parameters

P1, P2, P3: These methods need one or more Unicode values separated by commas.

Return value

String: It returns a string of Unicode, which we pass.

Example

const character = String.fromCharCode(86);
console.log(character);

const str = String.fromCharCode(87, 111, 110, 100, 101, 114, 102, 117, 108);
console.log(str)

Output

V
Wonderful

That’s it.