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    0.3.1 • Public • Published


    Spell checker for code, eg. Literals, Identifiers, Template Literals and Comments

    The rule validates the names of variables and functions. Validates the content of strings and comments. It is very useful in detecting potential typos, often unconscious and difficult to detect organoleptically, which unfortunately often lead to errors in code evaluation (once you use the correct name, a few lines later you make a typo). Applying this rule also increases code quality.


    You'll first need to install ESLint:

    $ npm i eslint --save-dev

    Next, install eslint-plugin-speller:

    $ npm install eslint-plugin-speller --save-dev

    Note: If you installed ESLint globally (using the -g flag) then you must also install eslint-plugin-speller globally.

    The plugin uses nspell (hunspell compatible spell checker). By default, dictionary-en-us is used. If you want use other language you must install additional dictionaries from For example, if you want to use Polish, you should install the dictionary-pl package:

    $ npm install dictionary-pl --save-dev


    Add speller to the plugins section of your .eslintrc configuration file. You can omit the eslint-plugin- prefix:

      "plugins": ["speller"]

    This plugin has only one rule. Enter the following configuration:

      "rules": {
        "speller/speller": "warn"

    Rule details

    Examples of incorrect code for this rule:

    var incorrrectVariable = "This is incorrect variable name";
    var incorrectLiteral = "This is incorrect littteerall";
    var incorrectComment = "This is incorrect comment"; // Incorrrecct commment

    Examples of correct code for this rule:

    var correctVariable = "This is correct variable";
    var correctLiteral = "This is correct literal";
    var correctComment = "This is correct comment"; // correct comment


    This rule accepts a single options argument:

    • Set the comments option to false if you want disable linting a comments (line or block). Default is true.
    • Set the literals option to false if tou want disable linting a literals (simple Literals or Template Literals). Default is true
    • Set the identifiers option to false if you want disable linting a identifiers (eg. name of variables or functions). Default is true.
    • Set the dictionary option to the name of the npm dictionary package that is compatible with nspell. A list of dictionaries is available here -> You must install the additional package on your own. The default is dictionary-en-us - you don't have to install it separately. It accepts Array or String.
    • Set the customDictionary option to a list of your own words that do not appear in the dictionary.
    • Set the attachItWords option to false if you want disable attach IT words from speller-it-words package
    • Set the suggest option to false if you want disable suggest similar word
    • Set the cache option to false if you want disable cache result of word spelling and suggest similar word

    Example option:

      "comments": true,
      "literals": true,
      "identifiers": true,
      "dictionary": ["dictionary-en-us", "dictionary-pl"],
      "customDictionary": ["yourcustomword"],
      "attachItWords": true,
      "suggest": true,
      "cache": true

    Example configuration:

       "speller/speller": ["warn",
                "comments": true,
                "literals": true,
                "identifiers": true,
                "dictionary": ["dictionary-en-us", "dictionary-pl"],
                "customDictionary": ["yourcustomword"],
                "attachItWords": "true",
                "suggest": true,
                "cache": true

    When Not To Use It

    If you like typos or incomprehensible variable names, don't use this rule.

    Further Reading

    The rule uses the nspell package, which is responsible for checking the existence of a word in the dictionary. Thanks to wooorm.


    npm i eslint-plugin-speller

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