# Intl.Collator() constructor — Parameters

> locales {{optional_inline}} : A string with a {{glossary("BCP 47 language tag")}} or an {{jsxref("Intl.Locale")}} instance, or an array of such locale identifiers.

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- Canonical URL: <https://wikikv.com/k/ref-mdn-7cb504ba173feb4bf692>
- Knowledge kind: `reference`
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- Updated: `2026-08-16T09:32:14.507335+00:00`
- Tags: `reference-seed`, `mdn`, `web`, `javascript`, `reference`, `global-objects`, `intl`, `collator`, `constructor`, `parameters`

## Provenance

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## Knowledge

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locales {{optional_inline}} : A string with a {{glossary("BCP 47 language tag")}} or an {{jsxref("Intl.Locale")}} instance, or an array of such locale identifiers. The runtime's default locale is used when undefined is passed or when none of the specified locale identifiers is supported. For the general form and interpretation of the locales argument, see the parameter description on the Intl main page.

options {{optional_inline}} : An object containing the following properties, in the order they are retrieved (all of them are optional): usage : Whether the comparison is for sorting a list of strings or fuzzy (for the Latin script diacritic-insensitive and case-insensitive) filtering a list of strings by key. Possible values are: "sort" (default) : For sorting a list of strings. "search" : For filtering a list of strings by testing each list item for a full-string match against a key. With "search", the caller should only pay attention to whether compare() returns zero or non-zero and should not distinguish the non-zero return values from each other. That is, it is inappropriate to use "search" for sorting/ordering. localeMatcher : The locale matching algorithm to use. Possible values are "lookup" and "best fit"; the default is "best fit". For information about this option, see Locale identification and negotiation. collation : Variant collations for certain locales, such as "emoji", "pinyin", "stroke", and so on. Only has an effect when usage is "sort" (because "search" is underlyingly its own collation type). For a list of supported collation types, see Intl.supportedValuesOf(); the default is "default". This option can also be set through the co Unicode extension key; if both are provided, this options property takes precedence. numeric : Whether numeric collation should be used, such that "1" &lt; "2" &lt; "10". Possible values are true and false; the default is false. This option can also be set through the kn Unicode extension key; if both are provided, this options property takes precedence. caseFirst : Whether upper case or lower case should sort first. Possible values are "upper", "lower", and "false" (use the locale's default); the default is "false". This option can also be set through the kf Unicode extension key; if both are provided, this options property takes precedence. …

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