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1.0.1 • Public • Published


A nodejs binding for crfsuite

MIT License npm version downloads Travis Appveyor

This is a link to the CRFSuite library written by Naoaki Okazaki. CRF or Conditional Random Fields are a class of statistical modeling method often applied in pattern recognition and machine learning and used for structured prediction.


For most "standard" use cases (on Mac, Linux, or Windows on a x86 or x64 processor), node-crfsuite will install easy with:

npm install crfsuite

API Usage

CRFSuite Tagger

const crfsuite = require('crfsuite')
const tagger = new crfsuite.Tagger()
let is_opened ='./path/to/crf.model')
console.log('File model is opened:', is_opened)
let tags = tagger.tag(input)
console.log('Tags: ', tags)

CRFSuite Trainer

const path = require('path')
const crfsuite = require('crfsuite')
const trainer = new crfsuite.Trainer({
  debug: true
let model_filename = path.resolve('./model.crfsuite')
let xseq = [['walk'], ['walk', 'shop'], ['clean', 'shop']]
let yseq = ['sunny', 'sunny', 'rainy']
// submit training data to the trainer
trainer.append(xseq, yseq)
// output: ./model.crfsuite

Installation Special Cases

We use node-pre-gyp to compile and publish binaries of the library for most common use cases (Linux, Mac, Windows on standard processor platforms). If you have a special case, node-crfsuite will work, but it will compile the binary during the install. Compiling with nodejs is done via node-gyp which requires Python 2.x, so please ensure you have it installed and in your path for all operating systems. Python 3.x will not work.

Build from source

# clone the project 
git clone --recursive
# go to working folder 
cd node-crfsuite
# install dependencies and build the binary 
npm install

For development:

# rebuild 
npm run build
# run unit-test 
npm test

Change Log

2019-07-18: Release version 1.0.0

  • Convert all sources to use N-API, remove nan
  • Add typescript declaration file
  • Cleanup package dependencies
  • CI Tool run & test only in node version 10 LTS
  • Add project convention: .gitattributes, .editorconfig
  • Enforced to use new keyword to create new Tagger and Trainer

2019-06-09: uses N-API

From crfsuite@0.9.6 the library uses N-API to use the binary in multiple version of Node.

  • Acording to Node.js Foundation: With N-API, native module developers can compile their module once per platform and architecture, and make it available for any version of Node.js that implements N-API. This holds true even for versions of Node.js that are built with a different VM, e.g. Node-ChakraCore.


Pull requests and stars are highly welcome.

For bugs and feature requests, please create an issue.

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