Tiny data mining engine, with path materialization and naive map-reduce-like logic
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Build Status JavaScript Style Guide


Simple and tiny DB engine, driven by RegExp and inspired by map-reduce.


TinyData implement simple 'text-like' searching in any deep-structure data, for example as MongoDB inner collection, with RegExp or simple function. Work in node and in browser too.


In node.js

npm install tiny-data

At browser (see 'lib_browser' dir)

<script src="tinydata.min.js"></script>


import TinyData from '../lib/tinydata'
import exampleData from './dataset'

let tinyDataObj = new TinyData(exampleData)

let gradeRule = /(?:[^.]+\.){2}grades\.([^.]+)\.([^.]+)/

let gradeSummator = (key, values, emit) => {
  let count = values.length
  let result = values.reduce((memo, val) => {
    return memo + val / count
  }, 0)
  emit(key, result.toFixed(1))

let averageGrades = tinyDataObj.search(gradeRule, gradeSummator)


With dataset as

  "mathematics": [
      "date": "2001-09-10",
      "grades": {
        "Bertie Ramos":4,
        "Kirsten Lloyd":5...
  "physics": [
      "date": "2001-09-10",
      "grades": {
        "Katelyn Mooney":4,
        "Andrea Rhodes":4...

result for questions "What total average score by student" will be:

{ "Bertie Ramos": [ "4.5" ],
  "Kirsten Lloyd": [ "3.3" ],
  "Rojas Hester": [ "5.0" ],
  "Katelyn Mooney": [ "5.0" ],
  "Brenda Carney": [ "2.0" ],
  "Dickerson Marshall": [ "5.0" ],
  "Francis Mcdaniel": [ "3.0" ],
  "Gregory Rivera": [ "2.0" ]...



let tinyDataObj = new TinyData(dataset/*Object*/)

Create new object with dataset.

Dataset wil be stringified internal like this

let dataset = {
  foo: [10,20,30],
  bar: {
    baz: 'one',
    rebar: 'two'
  quix: 2

// internal represention as array (simplified - realy dots '.' not a dot but some internal delimiter)

Search methods

let result = tinyDataObj.search(rule /*RegExp|function*/, finalizer/*function*/, interpSequence/*object*/)

Do search with some rule and process selected data with finalizer.

About rule

In depth - rule may be RegExp or function. If rule is RegExp - it may be usefull set interpSequence - how interpretate matched data - by default it {key: 1, value: 2} - first RegExp capture group us key and second - values.

In case of reverse position as {key: 2, value: 1} to readability code will be used tinyDataObj.searchBack() method.

If rule is function it must have next structure

let rule = (stringifiedItem/*String*/, emit/*function*/) => {
  // logic to process stringifiedItem
  emit(key, value)

About finalizer

As last step selected data may be prosecced with finalizer - its function with next structure

let finalizer = (key/*String|Number*/, values /*Array*/, emit/*function*/) => {
  // logic to process data
  emit(someKey, someValue)

Its called for every 'key', selected in first stage, but MAY return different key (even duplicated) and any value as result

Internal delimiter

let internalDelimiter = tinyDataObj.getInternalDelimiter()

This method return internal delimiter, which used internal instead of dots ('.'), to separete full stringified value. In case of RegExp used at search - all transformation cloaked, but in case of function used - internal delimiter must be used. For example:

// search for black color at foo at { foo : { color : 'black' }, bar : { color: 'white'} }
if (stringifiedItem === `foo${internalDelimiter}color${internalDelimiter}black`) {
  // some logic

RegExp transfomtation

// search for white color at foo at { foo : { color : 'black' }, bar : { color: 'white'} }
let color = 'white'
let re = new RegExp(`[^.]\\.color\\.${color}`)
let internalRegExp = tinyDataObj.doTransormRegExp(re/*RegExp*/)

if (stringifiedItem.test(internalRegExp) {
  // some logic

To simplify delimiter transfomtation and use dots ('.') for readability, doTransormRegExp may be used

Data by path helper

let path = 'foo.color'
let fooColor = tinyDataObj.getDataByPath(path/*string*/)

Helper to get data by path

General Notes:

In some cases TinyData may be faster and cleaner than routine forEach cycles. In some cases not.