Neologistic Paraphasic Mumbling


    1.1.1 • Public • Published


    This is a simple module that will calculate the inflation or deflation of a value between to date to the month by pulling the consumer price index data from the bureau of labor statistics.

    API Key

    In order the the script to run it will need an enviromental BLS_API_KEY variable with an API. You can register for one at


    First, it will need to be installed like every other package

    npm install deinflation

    The primary function is the adjust( value, dateA, dateB ) one, this will adjust a value for the two provided dates. If only one date is provided the other will be set as the latest date in the data set (as close to 'today' as possible). Returns an object with numerous bits of useful values, take for example the returned object for adjust(199.99, '10/1985');

    request: { value: 199.99, dateA: '10/1985', dateB: '5/2021' },
    process: {
        value: 199.99,
        dateA: [ 1985, 10 ],
        dateB: [ 2021, 5 ],
        cpiA: '108.7',
        cpiB: '269.195',
        adjustedValue: 495.27422309107635
    notices: [],
    updatedDate: false,
    autoAdjustedDate: false,
    type: 'inflation',
    value: 495.27422309107635,
    valueDiff: 295.28422309107634,
    percent: 247.64949402023916,
    money: '$495.27',
    moneyDiff: '$295.28'

    The only other function designed for direct use (not that the others are restricted) is the dataLastUpdated() function which returns a pretty string with the date the data was last updated. This is the date of the latest data in the dataset, not the last date the data was checked. For example, when called during development in August it reads;

    Inflation data last updated July 2021

    About the data

    The data used in internal calculations is gathered from the latest report from in Table 24. It is stored in a json file with a bit of meta data about when it was pulled. The data will attempt to update every 24hrs after the data is officially out of date however the BLS does not publish this data with any regularity I found noted


    npm i deinflation

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    • pgooch