IntlBaseline · Widely available

The Intl API provides language sensitive string comparison, number formatting, date and time formatting, and more.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Sep 28, 2017. Widely available since Mar 28, 2020.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–23Not supported

24+Supportedsince Jan 10, 2013

Current: 155

Edge

12+Supportedsince Jul 29, 2015

Current: 154

Firefox

1–28Not supported

29+Supportedsince Apr 29, 2014

Current: 157

Safari

1–9.1Not supported

10+Supportedsince Sep 20, 2016

Current: 27

MobileChrome Android

18–18Not supported

25+Supportedsince Feb 27, 2013

Current: 155

Firefox Android

4–55Not supported

56+Supportedsince Sep 28, 2017

Current: 157

Safari iOS

1–9.3Not supported

10+Supportedsince Sep 13, 2016

Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: toLocaleString.

Feature detection

JS · check before using

if (typeof Intl !== "undefined") {
  // Intl is available
}

Documentation (MDN)

Specification

tc39.es#introduction ↗

Usage share

caniuse.com/internationalization ↗

Sub-features

Support for each part of the feature (103). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
Array.toLocaleString	1	12	1	1	18	4	1
Array.toLocaleString.locales_parameter	24	79	52	7	25	56	7
Array.toLocaleString.options_parameter	24	79	52	7	25	56	7
BigInt.toLocaleString	67	79	68	14	67	68	14
BigInt.toLocaleString.locales_parameter	76	79	70	14	76	79	14
BigInt.toLocaleString.options_parameter	76	79	70	14	76	79	14
Date.toLocaleDateString	1	12	1	1	18	4	1
Date.toLocaleDateString.iana_time_zone_names	24	14	52	7	25	56	7
Date.toLocaleDateString.locales_parameter	24	12	29	10	25	56	10
Date.toLocaleDateString.options_parameter	24	12	29	10	25	56	10
Date.toLocaleString	1	12	1	1	18	4	1
Date.toLocaleString.iana_time_zone_names	24	14	52	7	25	56	7
Date.toLocaleString.locales_parameter	24	12	29	10	25	56	10
Date.toLocaleString.options_parameter	24	12	29	10	25	56	10
Date.toLocaleTimeString	1	12	1	1	18	4	1
Date.toLocaleTimeString.iana_time_zone_names	24	14	52	7	25	56	7
Date.toLocaleTimeString.locales_parameter	24	12	29	10	25	56	10
Date.toLocaleTimeString.options_parameter	24	12	29	10	25	56	10
Intl	24	12	29	10	25	56	10
Intl.Collator	24	12	29	10	25	56	10

Show 83 more

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
Intl.Collator.Collator	24	12	29	10	25	56	10
Intl.Collator.Collator.options_caseFirst_parameter	24	18	55	11	25	56	11
Intl.Collator.Collator.options_collation_parameter	86	86	85	14.1	86	85	14.5
Intl.Collator.Collator.options_ignorePunctuation_parameter	24	79	29	10	25	56	10
Intl.Collator.Collator.options_localeMatcher_parameter	24	79	29	10	25	56	10
Intl.Collator.Collator.options_numeric_parameter	24	79	29	10	25	56	10
Intl.Collator.Collator.options_sensitivity_parameter	24	79	29	10	25	56	10
Intl.Collator.Collator.options_usage_parameter	24	79	29	10	25	56	10
Intl.Collator.compare	24	12	29	10	25	56	10
Intl.Collator.resolvedOptions	24	12	29	10	25	56	10
Intl.Collator.supportedLocalesOf	24	12	29	10	25	56	10
Intl.DateTimeFormat	24	12	29	10	25	56	10
Intl.DateTimeFormat.DateTimeFormat	24	12	29	10	25	56	10
Intl.DateTimeFormat.DateTimeFormat.IntlLegacyConstructedSymbol	91	91	54	14.1	91	56	14.5
Intl.DateTimeFormat.DateTimeFormat.locales_parameter	24	12	29	10	25	56	10
Intl.DateTimeFormat.DateTimeFormat.options_parameter	24	12	29	10	25	56	10
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_calendar_parameter	80	80	76	14.1	80	79	14.5
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dateStyle_parameter	76	79	79	14.1	76	79	14.5
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_dayPeriod_parameter	92	92	90	14.1	92	90	14.5
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_fractionalSecondDigits_parameter	84	84	84	14.1	84	84	14.5
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_hourCycle_parameter	73	18	58	13	73	58	13
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_numberingSystem_parameter	80	80	76	14.1	80	79	14.5
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeStyle_parameter	76	79	79	14.1	76	79	14.5
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter	24	12	29	10	25	56	10
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZoneName_parameter.extended_values	95	95	91	15.4	95	91	15.4
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter	24	12	29	10	25	56	10
Intl.DateTimeFormat.DateTimeFormat.options_parameter.options_timeZone_parameter.iana_time_zones	24	14	52	10	25	56	10
Intl.DateTimeFormat.format	24	12	29	10	25	56	10
Intl.DateTimeFormat.formatRange	76	79	91	14.1	76	91	14.5
Intl.DateTimeFormat.formatRangeToParts	76	79	91	14.1	76	91	14.5
Intl.DateTimeFormat.formatToParts	57	18	51	11	57	56	11
Intl.DateTimeFormat.resolvedOptions	24	12	29	10	25	56	10
Intl.DateTimeFormat.resolvedOptions.computed_timezone	35	14	53	10	35	56	10
Intl.DateTimeFormat.supportedLocalesOf	24	12	29	10	25	56	10
Intl.NumberFormat	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.IntlLegacyConstructedSymbol	91	91	54	14.1	91	56	14.5
Intl.NumberFormat.NumberFormat.locales_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_compactDisplay_parameter	77	79	78	14.1	77	79	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_currencyDisplay_parameter	77	79	42	14.1	77	56	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_currencySign_parameter	77	79	78	14.1	77	79	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_currency_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_localeMatcher_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_maximumFractionDigits_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_maximumSignificantDigits_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_minimumFractionDigits_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_minimumIntegerDigits_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_minimumSignificantDigits_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_notation_parameter	77	79	78	14.1	77	79	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_numberingSystem_parameter	24	12	76	14.1	25	56	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_roundingIncrement_parameter	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.NumberFormat.options_parameter.options_roundingMode_parameter	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.NumberFormat.options_parameter.options_roundingPriority_parameter	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter	77	79	78	14.1	77	79	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_signDisplay_parameter.negative	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.NumberFormat.options_parameter.options_style_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_trailingZeroDisplay_parameter	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.NumberFormat.options_parameter.options_unitDisplay_parameter	77	79	78	14.1	77	79	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_unit_parameter	77	79	78	14.1	77	79	14.5
Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter	24	12	29	10	25	56	10
Intl.NumberFormat.NumberFormat.options_parameter.options_useGrouping_parameter.string_values	106	106	116	16.4	106	116	16.4
Intl.NumberFormat.format	24	12	29	10	25	56	10
Intl.NumberFormat.format.number_parameter-string_decimal	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.formatRange	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.formatRangeToParts	106	106	116	15.4	106	116	15.4
Intl.NumberFormat.formatToParts	64	12	58	13	64	58	13
Intl.NumberFormat.resolvedOptions	24	12	29	10	25	56	10
Intl.NumberFormat.supportedLocalesOf	24	12	29	10	25	56	10
Intl.getCanonicalLocales	54	16	48	10.1	54	56	10.3
Intl.supportedValuesOf	99	99	93	15.4	99	93	15.4
Number.toLocaleString	1	12	1	1	18	4	1
Number.toLocaleString.locales_parameter	24	12	29	10	26	56	10
Number.toLocaleString.options_parameter	24	12	29	10	26	56	10
Object.toLocaleString	1	12	1	1	18	4	1
String.localeCompare	1	12	1	3	18	4	1
String.localeCompare.locales_parameter	24	12	29	10	26	56	10
String.localeCompare.options_parameter	24	12	29	10	26	56	10
String.toLocaleLowerCase	1	12	1	1.3	18	4	1
String.toLocaleLowerCase.locales_parameter	58	12	55	10	58	55	10
String.toLocaleUpperCase	1	12	1	1.3	18	4	1
String.toLocaleUpperCase.locales_parameter	58	12	55	10	58	55	10
TypedArray.toLocaleString	7	12	51	5.1	18	51	5