Language Detection JSON API supporting 173 languages.
apilayer languagelayer API is a free Text Analysis API that requires OAuth authentication, is served over HTTPS and has unconfirmed CORS support.
Free, powerful language detection JSON API for 173 languages, supporting single and batch requests, PHP, JavaScript, Python, Ruby, Java, and more.
Details from languagelayer.com.

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A collection of information retrieval and natural language APIs
The apilayer languagelayer API is provided by Languagelayer API (languagelayer.com). Free, powerful language detection JSON API for 173 languages, supporting single and batch requests, PHP, JavaScript, Python, Ruby, Java, and more.
Yes. The apilayer languagelayer API is listed in the Text Analysis category of the public-apis directory, which only includes APIs that are free or have a free tier. Check its documentation for rate limits and paid plans.
Yes. The apilayer languagelayer API uses OAuth authentication, so you need to register for credentials before making requests.
CORS support for the apilayer languagelayer API is unknown. Test a request from the browser, and fall back to a server-side call if it is blocked.
Yes. The apilayer languagelayer API is served over HTTPS, so it's safe to use in production.