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2.0.0 • Public • Published

POS build & test npm license min minzip

pos-js is a Javascript port of Mark Watson's FastTag Part of Speech Tagger which was itself based on Eric Brill's trained rule set and English lexicon. It also includes a basic lexer that can be used to extract words and other tokens from text strings. Originally this was written by Percy Wegmann and is available on Google code.

This fork adds TypeScript support to a fork made by Darius Kazemi which added Node.JS and npm support.


Click here to check demo or checkout samples and demo source.


npm install @devil7softwares/pos


yarn add @devil7softwares/pos


import { Lexer, Tagger, TagType } from '@devil7softwares/pos';

const lexer = new Lexer();
const tagger = new Tagger();

const words = lexer.lex('This is some sample text. This text can contain multiple sentences.');
const taggedWords = tagger.tag(words);

for (const [word, tag] of taggedWords) {
    console.log(word + ' /' + tag);


jspos is licensed under the GNU LGPLv3


Thanks to Mark Watson for writing FastTag, which served as the basis for jspos.


Tag Description Example
CC Coord Conjuncn and,but,or
CD Cardinal number one,two
DT Determiner the,some
EX Existential there there
FW Foreign Word mon dieu
IN Preposition of,in,by
JJ Adjective big
JJR Adj., comparative bigger
JJS Adj., superlative biggest
LS List item marker 1,One
MD Modal can,should
NN Noun, sing. or mass dog
NNP Proper noun, sing. Edinburgh
NNPS Proper noun, plural Smiths
NNS Noun, plural dogs
POS Possessive ending 's
PDT Predeterminer all, both
PRP$ Possessive pronoun my,one's
PRP Personal pronoun I,you,she
RB Adverb quickly
RBR Adverb, comparative faster
RBS Adverb, superlative fastest
RP Particle up,off
SYM Symbol +,%,&
TO 'to' to
UH Interjection oh, oops
VB verb, base form eat
VBD verb, past tense ate
VBG verb, gerund eating
VBN verb, past part eaten
VBP Verb, present eat
VBZ Verb, present eats
WDT Wh-determiner which,that
WP Wh pronoun who,what
WP$ Possessive-Wh whose
WRB Wh-adverb how,where
, Comma ,
. Sent-final punct . ! ?
: Mid-sent punct. : ; Ñ
$ Dollar sign $
# Pound sign #
" quote "
( Left paren (
) Right paren )

See TagTypes.ts

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npm i fast-tag-pos

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  • devil7dk