Part Of Speech (POS) Tagger server
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Part Of Speech (POS) Tagger Web Service

This module is a command line wrapper around the npm module "pos". With it you can use the POS tagger from the command line or start it as a REST Web Service.

The "pos" module is maintained by Fortnight Labs.


node-tagger is licensed under the GNU LGPLv3


npm install -g node-tagger

Usage on the command line

tagger Hello world

Usage as a Web Service

Start the service

tagger --port=3000 &

  1. To use only the lexer

curl -X POST -H "Content-Type: application/json" -H "x-api-key: henri-id" -d '{"phrase":"Hello worldd"}' http://localhost:3000/ws/v1/pos.json/lex/phrase

  1. To use the tagger on the result from the lexer

curl -X POST -H "Content-Type: application/json" -H "x-api-key: henri-id" -d '{"words":["hello","world"]}' http://localhost:3000/ws/v1/pos.json/tag/words

  1. To combine the lexer and the tagger in one request

curl -X POST -H "Content-Type: application/json" -H "x-api-key: henri-id" -d '{"phrase":"hello world"}' http://localhost:3000/ws/v1/pos.json/tag/phrase

You can also use the HTML User Interface


You can also use the HTML API Documentation User Interface


Include this as a module in your own project

var tagger  = require('node-tagger'),
    express = require('express'),
    app     = express();

// Lex the phrase, then Tag it.
console.log('Hello World = ', tagger.api.tag(tagger.api.lex('Hello World')));

// Express configuration for ALL environment
app.configure(function () {

// USE: curl -X POST -H "Content-Type: application/json" -d '{"phrase":"hello world"}' http://localhost:3000/tag/phrase'/lex',;'/tag/phrase',;'/tag/words',;

app.listen(process.env.PORT || 3000);
console.log('Listening|port=' + (process.env.PORT || 3000));

To run the tests

npm test

To run the server

npm start

To deploy on Heroku

Make sure you have an account and the "heroku" command line tools installed. This project already has a Procfile for heroku, the only left is to replace MyPersonalTaggerService by the name you will chose for your service.

heroku create --stack cedar __MyPersonalTaggerService__
heroku config:set
git push heroku master

Then open your browser at or to have the REST API doc