IndexedDB vs localStorage

JavaScript performance comparison

Revision 27 of this test case created


This tests localStorage performance against IndexedDB, both acting as an object store. localStorage tests contain JSON stringify/parse methods.

There's a performance penalty for the IDB tests though, as these operate on IDB via a wrapper, so there are are some additional function calls being made.

Preparation code

<script src=""></script>

var scope = {};

// store setup

var idb = new IDBStore({
  dbName: 'jsperftestdb',
  storeName: 'jsperfteststore',
  dbVersion: '1.0',
  keyPath: 'id',
  autoIncrement: true,
  onStoreReady: function(){
var ls = window.localStorage;

// data setup

var i = 0,
    lastnames = ['smith','miller','doe','frankenstein','furter'],
    firstnames = ['peter','john','frank', 'james'],
    dummyData = {"web-app": {
  "servlet": [  
      "servlet-name": "cofaxCDS",
      "servlet-class": "org.cofax.cds.CDSServlet",
      "init-param": {
        "configGlossary:installationAt": "Philadelphia, PA",
        "configGlossary:adminEmail": "",
        "configGlossary:poweredBy": "Cofax",
        "configGlossary:poweredByIcon": "/images/cofax.gif",
        "configGlossary:staticPath": "/content/static",
        "templateProcessorClass": "org.cofax.WysiwygTemplate",
        "templateLoaderClass": "org.cofax.FilesTemplateLoader",
        "templatePath": "templates",
        "templateOverridePath": "",
        "defaultListTemplate": "listTemplate.htm",
        "defaultFileTemplate": "articleTemplate.htm",
        "useJSP": false,
        "jspListTemplate": "listTemplate.jsp",
        "jspFileTemplate": "articleTemplate.jsp",
        "cachePackageTagsTrack": 200,
        "cachePackageTagsStore": 200,
        "cachePackageTagsRefresh": 60,
        "cacheTemplatesTrack": 100,
        "cacheTemplatesStore": 50,
        "cacheTemplatesRefresh": 15,
        "cachePagesTrack": 200,
        "cachePagesStore": 100,
        "cachePagesRefresh": 10,
        "cachePagesDirtyRead": 10,
        "searchEngineListTemplate": "forSearchEnginesList.htm",
        "searchEngineFileTemplate": "forSearchEngines.htm",
        "searchEngineRobotsDb": "WEB-INF/robots.db",
        "useDataStore": true,
        "dataStoreClass": "org.cofax.SqlDataStore",
        "redirectionClass": "org.cofax.SqlRedirection",
        "dataStoreName": "cofax",
        "dataStoreDriver": "",
        "dataStoreUrl": "jdbc:microsoft:sqlserver://LOCALHOST:1433;DatabaseName=goon",
        "dataStoreUser": "sa",
        "dataStorePassword": "dataStoreTestQuery",
        "dataStoreTestQuery": "SET NOCOUNT ON;select test='test';",
        "dataStoreLogFile": "/usr/local/tomcat/logs/datastore.log",
        "dataStoreInitConns": 10,
        "dataStoreMaxConns": 100,
        "dataStoreConnUsageLimit": 100,
        "dataStoreLogLevel": "debug",
        "maxUrlLength": 500}},
      "servlet-name": "cofaxEmail",
      "servlet-class": "org.cofax.cds.EmailServlet",
      "init-param": {
      "mailHost": "mail1",
      "mailHostOverride": "mail2"}},
      "servlet-name": "cofaxAdmin",
      "servlet-class": "org.cofax.cds.AdminServlet"},
      "servlet-name": "fileServlet",
      "servlet-class": "org.cofax.cds.FileServlet"},
      "servlet-name": "cofaxTools",
      "servlet-class": "org.cofax.cms.CofaxToolsServlet",
      "init-param": {
        "templatePath": "toolstemplates/",
        "log": 1,
        "logLocation": "/usr/local/tomcat/logs/CofaxTools.log",
        "logMaxSize": "",
        "dataLog": 1,
        "dataLogLocation": "/usr/local/tomcat/logs/dataLog.log",
        "dataLogMaxSize": "",
        "removePageCache": "/content/admin/remove?cache=pages&id=",
        "removeTemplateCache": "/content/admin/remove?cache=templates&id=",
        "fileTransferFolder": "/usr/local/tomcat/webapps/content/fileTransferFolder",
        "lookInContext": 1,
        "adminGroupID": 4,
        "betaServer": true}}],
  "servlet-mapping": {
    "cofaxCDS": "/",
    "cofaxEmail": "/cofaxutil/aemail/*",
    "cofaxAdmin": "/admin/*",
    "fileServlet": "/static/*",
    "cofaxTools": "/tools/*"},
  "taglib": {
    "taglib-uri": "cofax.tld",
    "taglib-location": "/WEB-INF/tlds/cofax.tld"}
Benchmark.prototype.setup = function() {
    scope.i = 0;
    scope.smallData = {
      'lastname': lastnames[Math.floor(Math.random()*5)],
      'firstanme': firstnames[Math.floor(Math.random()*4)],
      'dummyData': {}
    scope.largeData = {
      'lastname': lastnames[Math.floor(Math.random()*5)],
      'firstanme': firstnames[Math.floor(Math.random()*4)],
      'dummyData': dummyData

Preparation code output

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Testing in unknown unknown
Test Ops/sec
localStorage read/write small data = ++scope.i;
ls.setItem(, JSON.stringify(scope.smallData));
var value = JSON.parse(ls.getItem(;
localStorage read/write large data = ++scope.i;
ls.setItem(, JSON.stringify(scope.largeData));
var value = JSON.parse(ls.getItem(;
IDB read/write small data
// async test
var value; = ++scope.i;
idb.put(scope.smallData, function(res){
  idb.get(, function(res){
    value = res;
IDB read/write large data
// async test
var value; = ++scope.i;
idb.put(scope.largeData, function(res){
  idb.get(, function(res){
    value = res;

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1 comment

Brian Kardell commented :

I've updated original tests to function again since it used github serving of code and github uses rawgithub now the original tests haven't worked for some time.

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