Sample code: Translate natural language with the Watson Language Translator service

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Interactive code: When you see Run at the top of a code sample, you can run the code, check the results, make changes, and run it again. When you see Deploy, you can deploy the code into the developerWorks IBM Cloud account.

About this code

This code shows you how to use the node.js API for the Watson Language Translator service. Given some text, a source language, and a target language, Watson translates that text and returns one or more translations to you.

The code has five basic sections:

  1. The main() method. This is the entry point to the code. It creates the LanguageTranslationV2 object and then invokes the three translation functions.
  2. The englishToFrench() function. This takes text and a LanguageTranslationV2 object as its inputs and calls the Language Translator service to convert the input from English into French.
  3. The frenchToSpanish() function. This converts French text into Spanish.
  4. The spanishToEnglish() function converts Spanish to English.
  5. A set of default parameters and the code that runs this module if it is invoked by itself (as opposed to being invoked by a require() statement). See the node.js documentation for more information on the implications of the require.main === module statement.
Show result

This code takes a string as input and translates the string from English to French, from French to Spanish, and finally from Spanish into English again. The calls to the Watson Language Translator service are wrapped in JavaScript Promises to handle the asynchronous nature of the service.

See the overview of the Language Translator service or the github repo for the Watson node.js API for more information.

Try changing the textToTranslate parameter or the language codes to see what happens.

Using this code once deployed

To use this code once you've deployed it, you must create an instance of the Watson Language Translator service:

To invoke the code, pass a JSON structure that matches the defaultParameters object as shown above with the following changes:

  1. The username, password, and url fields must be filled in with the credentials for your Language Translator service instance.
  2. The use_unauthenticated field must be false.

For more information, see the developerWorks tutorial Invoking actions on the IBM Cloud Functions platform.


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Zone=Cognitive computing, Java development
ArticleID=1047414
ArticleTitle=Sample code: Translate natural language with the Watson Language Translator service
publish-date=07182017