šŸ”ˆ Sample Node.js Application for the IBM Watson Text to Speech Service
JavaScript CSS


Text to Speech Demo Build Status

The IBM Watson Text to Speech service is designed for streaming, low latency, synthesis of audio from text. It is the inverse of the automatic speech recognition.

Deploy to Bluemix

Getting started

  1. You need a Bluemix account. If you don't have one, sign up.

  2. Download and install the Cloud-foundry CLI tool if you haven't already.

  3. Edit the manifest.yml file and change <application-name> to something unique. The name you use determines the URL of your application. For example, <application-name>.mybluemix.net.

    - services:
      - my-service-instance
      name: <application-name>
      command: npm start
      path: .
      memory: 512M
  4. Connect to Bluemix with the command line tool.

    cf api https://api.ng.bluemix.net
    cf login
  5. Create and retrieve service keys to access the Text to Speech service:

    cf create-service text_to_speech standard my-tts-service
    cf create-service-key my-tts-service myKey
    cf service-key my-tts-service myKey
  6. Create a .env file in the root directory by copying the sample .env.example file using the following command:

    cp .env.example .env

    You will update the .env with the information you retrieved in steps 5.

    The .env file will look something like the following:

  7. Install the dependencies you application need:

    npm install
  8. Start the application locally:

    npm start
  9. Point your browser to http://localhost:3000.

  10. Optional: Push the application to Bluemix:

    cf push

After completing the steps above, you are ready to test your application. Start a browser and enter the URL of your application.

        <your application name>.mybluemix.net

For more details about developing applications that use Watson Developer Cloud services in Bluemix, see Getting started with Watson Developer Cloud and Bluemix.


  • The main source of troubleshooting and recovery information is the Bluemix log. To view the log, run the following command:

    cf logs <application-name> --recent
  • For more details about the service, see the documentation for the Text to Speech service.

Directory structure

ā”œā”€ā”€ app.js                      // express routes
ā”œā”€ā”€ config                      // express configuration
ā”‚   ā”œā”€ā”€ error-handler.js
ā”‚   ā”œā”€ā”€ express.js
ā”‚   ā””ā”€ā”€ security.js
ā”œā”€ā”€ manifest.yml
ā”œā”€ā”€ package.json
ā”œā”€ā”€ public                      // static resources
ā”œā”€ā”€ server.js                   // entry point
ā”œā”€ā”€ test                        // tests
ā””ā”€ā”€ views                       // react components


This sample code is licensed under Apache 2.0.



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Privacy Notice

Sample web applications that include this package may be configured to track deployments to IBM Bluemix and other Cloud Foundry platforms. The following information is sent to a Deployment Tracker service on each deployment:

  • Node.js package version
  • Node.js repository URL
  • Application Name (application_name)
  • Space ID (space_id)
  • Application Version (application_version)
  • Application URIs (application_uris)
  • Labels of bound services
  • Number of instances for each bound service and associated plan information

This data is collected from the package.json file in the sample application and the VCAP_APPLICATION and VCAP_SERVICES environment variables in IBM Bluemix and other Cloud Foundry platforms. This data is used by IBM to track metrics around deployments of sample applications to IBM Bluemix to measure the usefulness of our examples, so that we can continuously improve the content we offer to you. Only deployments of sample applications that include code to ping the Deployment Tracker service will be tracked.