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String.fromCodePoint()

The static String.fromCodePoint() method returns a string created by using the specified sequence of code points.

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Syntax

String.fromCodePoint(num1)
String.fromCodePoint(num1, num2)
String.fromCodePoint(num1, num2, /* …, */ numN)

Parameters

num1, ..., numN

A sequence of code points.

Return value

A string created by using the specified sequence of code points.

Exceptions

  • A RangeError is thrown if an invalid Unicode code point is given (e.g. "RangeError: NaN is not a valid code point").

Description

This method returns a string (and not a String object).

Because fromCodePoint() is a static method of String, you must call it as String.fromCodePoint(), rather than as a method of a String object you created.

Examples

Using fromCodePoint()

Valid input:

String.fromCodePoint(42);       // "*"
String.fromCodePoint(65, 90);   // "AZ"
String.fromCodePoint(0x404);    // "\u0404" === "Є"
String.fromCodePoint(0x2F804);  // "\uD87E\uDC04"
String.fromCodePoint(194564);   // "\uD87E\uDC04"
String.fromCodePoint(0x1D306, 0x61, 0x1D307); // "\uD834\uDF06a\uD834\uDF07"

Invalid input:

String.fromCodePoint('_');      // RangeError
String.fromCodePoint(Infinity); // RangeError
String.fromCodePoint(-1);       // RangeError
String.fromCodePoint(3.14);     // RangeError
String.fromCodePoint(3e-2);     // RangeError
String.fromCodePoint(NaN);      // RangeError

Compared to fromCharCode()

String.fromCharCode() cannot return supplementary characters (i.e. code points 0x0100000x10FFFF) by specifying their code point. Instead, it requires the UTF-16 surrogate pair in order to return a supplementary character:

String.fromCharCode(0xD83C, 0xDF03); // Code Point U+1F303 "Night with
String.fromCharCode(55356, 57091);   // Stars" === "\uD83C\uDF03"

String.fromCodePoint(), on the other hand, can return 4-byte supplementary characters, as well as the more common 2-byte BMP characters, by specifying their code point (which is equivalent to the UTF-32 code unit):

String.fromCodePoint(0x1F303); // or 127747 in decimal

Specifications

Browser compatibility

Desktop Mobile Server
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet Deno Node.js
fromCodePoint
41
12
29
No
28
9
41
41
29
28
9
4.0
1.0
4.0.0
0.12.0

See also

© 2005–2022 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCodePoint