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Translator: sourceLanguage property

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

The sourceLanguage read-only property of the Translator interface returns the expected language of the input text to be translated.

A Translator instance's sourceLanguage is set when creating it via a create() call.

Value

A string specifying the source language. This will be a valid BCP 47 language tag (as specified in RFC 5646).

Examples

const translator = await Translator.create({
  sourceLanguage: "en",
  targetLanguage: "ja",
});

// Logs "en"
console.log(translator.sourceLanguage);

Specifications

Specification
Translator and Language Detector APIs>
# dom-translator-sourcelanguage>

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Opera Safari Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet WebView Android WebView on iOS
sourceLanguage
138Availability may be subject to geographical restrictions.
 No No
122Availability may be subject to geographical restrictions.
 No No No No No No No No

See also

© 2005–2025 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Translator/sourceLanguage