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SMS Sentiment Analysis with IBM Tone Analyzer

Deploy to Heroku Remix on Glitch Deploy to IBM Cloud

This example uses IBM Tone Analyzer to analyze SMS messages and determine the sentiment of the text.

SMS Messages sent through Nexmo will be sent to IBM Tone Analyzer and a series of scores and tones returned to the console.

IBM Tone Analyzer Service

Reference: API Docs: GitHub:

Register for the IBM Tone Analyzer service. Once created, make a note of the API Key and URL for use later. These can be found in the Manage page of the IBM Cloud dashboard after login.

Note for IBM Cloud deploy: Once the app has deployed, go to the app dashboard and update the environment variables with these credentials under "Runtime > Environment Variables"

Running the App

This sample app uses a .env file to provide the API key and URL.

Copy the provided .env.example file to a new file called .env:

cp .env.example > .env

Then update the values with those from the IBM Tone Analyzer service Manage page, and then save.


Also, expose the application to the internet using tools like ngrok. To see how, check out this guide.

Using Docker

To run the app using Docker, run the following command in a terminal:

docker-compose up

This will create a new image with all the dependencies and run it at http://localhost:3000.

Using Node

To run the app using node, run the following command in a terminal:

npm install && node index.js

This will install all the dependencies and run it at http://localhost:3000.

Linking the app to Nexmo

For this example app a Nexmo number and SMS webhook setup is needed.

This can be achieved with the Nexmo CLI. Install the CLI by following these instructions.

Rent a New Virtual Number

Renting a number will need to be in place. This can also be achieved using the CLI by running this command:

nexmo number:buy --country_code US

Adding the SMS Webhook

Update the number created with the URL of the hosted or local server.

nexmo link:sms phone_number https://my-hostname/message

Try it out

With the example Node application running in the terminal, send various SMS messages to the virtual number. The terminal will output the response from IBM Tone Analyzer.

Watson analysis

Watson analysis


This app prints out to the console. For integration with an application, extend the analyzeTone function to suit your needs.


Javascript example using IBM Watson Tone Analysis to analyze SMS messages and determine the sentiment of the text.








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