It's a handy, and not overly-fancy tool for understanding, changing, and playing with english.

Code Quality Rank: L3
Monthly Downloads: 0
Programming language: JavaScript
License: MIT License
Tags: Misc     NLP     Natural Language     English    
Latest version: v14.7.1

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compromise modest natural language processing npm install compromise by Spencer Kelly and many contributors

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don't you find it strange, how easy text is to make,

 ↬ᔐᖜ↬   and how hard it is to actually parse and use?

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compromise tries its best to turn text into data. it makes limited and sensible decisions. it's not as smart as you'd think.

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import nlp from 'compromise'

let doc = nlp('she sells seashells by the seashore.')
// 'she sold seashells by the seashore.'

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don't be fancy, at all:

if (doc.has('simon says #Verb')) {
  return true

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grab parts of the text:

let doc = nlp(entireNovel)
doc.match('the #Adjective of times').text()
// "the blurst of times?"

match docs <!-- spacer -->

and get data:

import plg from 'compromise-speech'

let doc = nlp('Milwaukee has certainly had its share of visitors..')
  "text": "Milwaukee",
  "terms": [{ 
    "normal": "milwaukee",
    "syllables": ["mil", "wau", "kee"]

json docs

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avoid the problems of brittle parsers:

let doc = nlp("we're not gonna take it..")

doc.has('gonna') // true
doc.has('going to') // true (implicit)

// transform
// 'we are not going to take it..'

contraction docs <!-- spacer -->

and whip stuff around like it's data:

let doc = nlp('ninety five thousand and fifty two')
// 'ninety five thousand and seventy two'

number docs

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-because it actually is-

let doc = nlp('the purple dinosaur')
// 'the purple dinosaurs'

noun docs

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Use it on the client-side:

<script src="https://unpkg.com/compromise"></script>
  var doc = nlp('two bottles of beer')
  document.body.innerHTML = doc.text()
  // 'one bottle of beer'

or likewise:

import nlp from 'compromise'

var doc = nlp('London is calling')
// 'London is not calling'

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compromise is ~250kb (minified):

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it's pretty fast. It can run on keypress:

it works mainly by conjugating all forms of a basic word list.

The final lexicon is ~14,000 words:

you can read more about how it works, here. it's weird.

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<!-- one/two/three parts --> okay - compromise/one A tokenizer of words, sentences, and punctuation.

import nlp from 'compromise/one'

let doc = nlp("Wayne's World, party time")
let data = doc.json()
/* [{ 
  normal:"wayne's world party time",
    terms:[{ text: "Wayne's", normal: "wayne" }, 

tokenizer docs

compromise/one splits your text up, wraps it in a handy API, and does nothing else -

/one is quick - most sentences take a 10th of a millisecond.

It can do ~1mb of text a second - or 10 wikipedia pages.

Infinite jest is takes 3s.

You can also parallelize, or stream text to it with compromise-speed.

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<!-- two --> compromise/two A part-of-speech tagger, and grammar-interpreter.

import nlp from 'compromise/two'

let doc = nlp("Wayne's World, party time")
let str = doc.match('#Possessive #Noun').text()
// "Wayne's World"

tagger docs

compromise/two automatically calculates the very basic grammar of each word.

this is more useful than people sometimes realize.

Light grammar helps you write cleaner templates, and get closer to the information.

<!-- Part-of-speech tagging is profoundly-difficult task to get 100% on. It is also a profoundly easy task to get 85% on. -->

compromise has 83 tags, arranged in a handsome graph.

#FirstName → #Person → #ProperNoun → #Noun

you can see the grammar of each word by running doc.debug()

you can see the reasoning for each tag with nlp.verbose('tagger').

if you prefer Penn tags, you can derive them with:

let doc = nlp('welcome thrillho')

<!-- three --> compromise/three Phrase and sentence tooling.

import nlp from 'compromise/three'

let doc = nlp("Wayne's World, party time")
let str = doc.people().normalize().text()
// "wayne"

selection docs

compromise/three is a set of tooling to zoom into and operate on parts of a text.

.numbers() grabs all the numbers in a document, for example - and extends it with new methods, like .subtract().

When you have a phrase, or group of words, you can see additional metadata about it with .json()

let doc = nlp("four out of five dentists")
    text: 'four out of five',
    terms: [ [Object], [Object], [Object], [Object] ],
    fraction: { numerator: 4, denominator: 5, decimal: 0.8 }
let doc = nlp("$4.09CAD")
    text: '$4.09CAD',
    terms: [ [Object] ],
    number: { prefix: '$', num: 4.09, suffix: 'cad'}



  • .text() - return the document as text
  • .json() - return the document as data
  • .debug() - pretty-print the interpreted document
  • .out() - a named or custom output
  • .html({}) - output custom html tags for matches
  • .wrap({}) - produce custom output for document matches
  • .found [getter] - is this document empty?
  • .docs [getter] get term objects as json
  • .length [getter] - count the # of characters in the document (string length)
  • .isView [getter] - identify a compromise object
  • .compute() - run a named analysis on the document
  • .clone() - deep-copy the document, so that no references remain
  • .termList() - return a flat list of all Term objects in match
  • .cache({}) - freeze the current state of the document, for speed-purposes
  • .uncache() - un-freezes the current state of the document, so it may be transformed

(match methods use the match-syntax.)

  • .match('') - return a new Doc, with this one as a parent
  • .not('') - return all results except for this
  • .matchOne('') - return only the first match
  • .if('') - return each current phrase, only if it contains this match ('only')
  • .ifNo('') - Filter-out any current phrases that have this match ('notIf')
  • .has('') - Return a boolean if this match exists
  • .before('') - return all terms before a match, in each phrase
  • .after('') - return all terms after a match, in each phrase
  • .union() - return combined matches without duplicates
  • .intersection() - return only duplicate matches
  • .complement() - get everything not in another match
  • .settle() - remove overlaps from matches
  • .growRight('') - add any matching terms immediately after each match
  • .growLeft('') - add any matching terms immediately before each match
  • .grow('') - add any matching terms before or after each match
  • .sweep(net) - apply a series of match objects to the document
  • .splitOn('') - return a Document with three parts for every match ('splitOn')
  • .splitBefore('') - partition a phrase before each matching segment
  • .splitAfter('') - partition a phrase after each matching segment
  • .lookup([]) - quick find for an array of string matches
  • .autoFill() - create type-ahead assumptions on the document
  • .tag('') - Give all terms the given tag
  • .tagSafe('') - Only apply tag to terms if it is consistent with current tags
  • .unTag('') - Remove this term from the given terms
  • .canBe('') - return only the terms that can be this tag
  • .pre('') - add this punctuation or whitespace before each match
  • .post('') - add this punctuation or whitespace after each match
  • .trim() - remove start and end whitespace
  • .hyphenate() - connect words with hyphen, and remove whitespace
  • .dehyphenate() - remove hyphens between words, and set whitespace
  • .toQuotations() - add quotation marks around these matches
  • .toParentheses() - add brackets around these matches
  • .map(fn) - run each phrase through a function, and create a new document
  • .forEach(fn) - run a function on each phrase, as an individual document
  • .filter(fn) - return only the phrases that return true
  • .find(fn) - return a document with only the first phrase that matches
  • .some(fn) - return true or false if there is one matching phrase
  • .random(fn) - sample a subset of the results

(these methods are on the main nlp object)

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Misc selections


This library comes with a considerate, common-sense baseline for english grammar.

You're free to change, or lay-waste to any settings - which is the fun part actually.

the easiest part is just to suggest tags for any given words:

let myWords = {
  kermit: 'FirstName',
  fozzie: 'FirstName',
let doc = nlp(muppetText, myWords)

or make heavier changes with a compromise-plugin.

import nlp from 'compromise'
  // add new tags
  tags: {
    Character: {
      isA: 'Person',
      notA: 'Adjective',
  // add or change words in the lexicon
  words: {
    kermit: 'Character',
    gonzo: 'Character',
  // change inflections
  irregulars: {
    get: {
      pastTense: 'gotten',
      gerund: 'gettin'
  // add new methods to compromise
  api: (View) => {
    View.prototype.kermitVoice = function () {
      this.match('i [(am|was)]').prepend('um,')
      return this

.plugin() docs

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gentle introduction:
Concepts API Plugins
Accuracy Accessors Adjectives
Caching Constructor-methods Dates
Case Contractions Export
Filesize Insert Hash
Internals Json Html
Justification Lists Keypress
Lexicon Loops Ngrams
Match-syntax Match Numbers
Performance Nouns Paragraphs
Plugins Output Scan
Projects Selections Sentences
Tagger Sorting Syllables
Tags Split Pronounce
Tokenization Text Strict
Named-Entities Utils Penn-tags
Whitespace Verbs Typeahead
World data Normalization Sweep
Fuzzy-matching Typescript Mutation
Root-forms Character Offsets
Some fun Applications:

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These are some helpful extensions:


npm install compromise-dates


npm install compromise-stats


npm install compromise-syllables


npm install compromise-wikipedia

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we're committed to typescript/deno support, both in main and in the official-plugins:

import nlp from 'compromise'
import stats from 'compromise-stats'

const nlpEx = nlp.extend(stats)

nlpEx('This is type safe!').ngrams({ min: 1 })

typescript docs

  • slash-support: We currently split slashes up as different words, like we do for hyphens. so things like this don't work: nlp('the koala eats/shoots/leaves').has('koala leaves') //false

  • inter-sentence match: By default, sentences are the top-level abstraction. Inter-sentence, or multi-sentence matches aren't supported without a plugin: nlp("that's it. Back to Winnipeg!").has('it back')//false

  • nested match syntax: the danger beauty of regex is that you can recurse indefinitely. Our match syntax is much weaker. Things like this are not (yet) possible: doc.match('(modern (major|minor))? general') complex matches must be achieved with successive .match() statements.

  • dependency parsing: Proper sentence transformation requires understanding the syntax tree of a sentence, which we don't currently do. We should! Help wanted with this.


☂️ Isn't javascript too... yeah it is! it wasn't built to compete with NLTK, and may not fit every project. string processing is synchronous too, and parallelizing node processes is weird. See here for information about speed & performance, and here for project motivations
💃 Can it run on my arduino-watch? Only if it's water-proof! Read quick start for running compromise in workers, mobile apps, and all sorts of funny environments. 🌎 Compromise in other Languages? we've got work-in-progress forks for German, French, Spanish, and Italian in the same philosophy. and need some help. ✨ Partial builds? we do offer a tokenize-only build, which has the POS-tagger pulled-out. but otherwise, compromise isn't easily tree-shaken. the tagging methods are competitive, and greedy, so it's not recommended to pull things out. Note that without a full POS-tagging, the contraction-parser won't work perfectly. ((spencer's cool) vs. (spencer's house)) It's recommended to run the library fully.

See Also: