idb_shim 1.7.0+1

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idb shim

Pure dart indexed db like API on top of native, websql or memory implementation. Its goal is to support browsers that do not support the indexed_db api with very few changes.

It also allows to test your database schema and access in vm unit tests.

Build Status


Assume you have the existing:

import 'dart:indexed_db';, version: xxx, onUpgradeNeeded: yyy);

This can be replaced by:

import 'package:idb_shim/idb_browser.dart'
IdbFactory idbFactory = getIdbFactory();, version: xxx, onUpgradeNeeded: yyy);

All other existing code remains unchanged. Simple example below:

// define the store name
const String storeName = "records";

// open the database
Database db = await"my_records.db", version: 1,
    onUpgradeNeeded: (VersionChangeEvent event) {
  Database db = event.database;
  // create the store
  db.createObjectStore(storeName, autoIncrement: true);

// put some data
var txn = db.transaction(storeName, "readwrite");
var store = txn.objectStore(storeName);
var key = await store.put({"some": "data"});
await txn.completed;

// read some data
txn = db.transaction(storeName, "readonly");
store = txn.objectStore(storeName);
Map value = await store.getObject(key);
await txn.completed;



Testing with dartdevc

pub serve test --web-compiler=dartdevc --port=8079
pub run test -p chrome --pub-serve=8079

Known limitations/issues

Memory/Io/WebSql implementation

  • For autoincrement, if key is set, it cannot be set as a different type than int
  • Nextunique and prevunique not support (for now)
  • No support for Cursor.source
  • No generic support for blocked. It is always possible to upgrade the database, however other tabs will get blocked in their future calls
  • Blocked and onVersionChange event support, this is actually tricky for websql, actually the new db won't be blocked but the old one will! so the proper common implementation is to register for onVersionChange event and when receiving simply reload the page. Sample code to come
  • Index.get: only by key is supported (no range yet)
  • WebSql implementation issue SqlResultSet.rows.first is not working in dart2js (bug?)
Type of data
  • Only stuff that can be JSON serialized/deserialized
  • DateTime is not supported, it should be converted to string using toIso8601String
  • Cyclic dependecy are not supported (per JSON serialization)
  • Large float are not converted to int (native indexeddb implementation does this)
Type of key
  • String and num (double and int) are supported
  • DateTime is not supported, convert them to String
  • No support for compound index

Native exception

  • Native exception type have no match in dart so a custom DatabaseError object is created to wrap the exception

Ie limitation

IE 11, Edge 12 has the following limitations:

  • no support for reading objectStore.autoIncrement properties
  • ObjectStore.count() without argument throw a 'DataError' exception...better avoid count() on IE...
  • it seems ie close the transaction 'sooner' then chrome/firefox, i.e. calling an sync function that wrap an idb calls makes the transaction terminate
  • IDBIndex.multiEntry not supported on ie

Safari limitation

Safari has the following limitations (as of v 9.0)

  • no support for transactions on multiple stores
  • very short transaction life cycle (no await on sdk 1.12)


  • remove websql support
  • support keyPath as array


  • dart2 only, no websql yet


  • Dart2 compatible (except websql shim)
  • Depends on sembast 1.7.0


  • Add implicit-cast: false support


  • Depends on sembast 1.4.0


  • Add IdbFactory.cmp


  • Simulate multistore transaction on Safari


  • Add support for import/export (sembast export format)
  • Fix timing to mimic IE limitation
  • Add workaround for transaction bug in sdk 1.13


  • Fix implementation for IE/Edge where the transaction life-cycle is shorter


  • Add support for ObjectStore.deleteIndex


  • Fix openCursor for Index that included null key before (sembast)
  • Travis test integration


  • Initial revision

Use this package as a library

1. Depend on it

Add this to your package's pubspec.yaml file:

  idb_shim: ^1.7.0+1

2. Install it

You can install packages from the command line:

with pub:

$ pub get

Alternatively, your editor might support pub get. Check the docs for your editor to learn more.

3. Import it

Now in your Dart code, you can use:

import 'package:idb_shim/idb.dart';
import 'package:idb_shim/idb_browser.dart';
import 'package:idb_shim/idb_client.dart';
import 'package:idb_shim/idb_client_memory.dart';
import 'package:idb_shim/idb_client_native.dart';
import 'package:idb_shim/idb_client_sembast.dart';
import 'package:idb_shim/idb_client_websql.dart';
import 'package:idb_shim/idb_console.dart';
import 'package:idb_shim/idb_io.dart';
import 'package:idb_shim/utils/idb_import_export.dart';
import 'package:idb_shim/utils/idb_utils.dart';
Version Uploaded Documentation Archive
1.7.0+1 Nov 16, 2018 Go to the documentation of idb_shim 1.7.0+1 Download idb_shim 1.7.0+1 archive
1.7.0 Oct 3, 2018 Go to the documentation of idb_shim 1.7.0 Download idb_shim 1.7.0 archive
1.6.0+2 Aug 10, 2018 Go to the documentation of idb_shim 1.6.0+2 Download idb_shim 1.6.0+2 archive
1.6.0+1 Jul 24, 2018 Go to the documentation of idb_shim 1.6.0+1 Download idb_shim 1.6.0+1 archive
1.6.0 Jul 24, 2018 Go to the documentation of idb_shim 1.6.0 Download idb_shim 1.6.0 archive
1.5.0 Jun 20, 2018 Go to the documentation of idb_shim 1.5.0 Download idb_shim 1.5.0 archive
1.4.2 Mar 1, 2018 Go to the documentation of idb_shim 1.4.2 Download idb_shim 1.4.2 archive
1.4.1 Feb 26, 2018 Go to the documentation of idb_shim 1.4.1 Download idb_shim 1.4.1 archive
1.4.0 Jun 27, 2017 Go to the documentation of idb_shim 1.4.0 Download idb_shim 1.4.0 archive
1.3.7 Jun 20, 2017 Go to the documentation of idb_shim 1.3.7 Download idb_shim 1.3.7 archive

All 43 versions...

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We analyzed this package on Dec 5, 2018, and provided a score, details, and suggestions below. Analysis was completed with status completed using:

  • Dart: 2.1.0
  • pana: 0.12.7


Detected platforms: web

Platform components identified in package: html, io.

Maintenance suggestions

Maintain an example.

None of the files in your example/ directory matches a known example patterns. Common file name patterns include: main.dart, example.dart or you could also use idb_shim.dart. Packages with multiple examples should use example/


Package Constraint Resolved Available
Direct dependencies
Dart SDK >=2.0.0-dev.58 <3.0.0
collection >=1.14.10 <3.0.0 1.14.11
js >=0.6.1 <2.0.0 0.6.1+1
path >=1.6.1 <3.0.0 1.6.2
sembast >=1.11.0 <3.0.0 1.12.0+1
Transitive dependencies
synchronized 1.5.3
Dev dependencies
build_runner >=0.9.0
build_test >=0.10.2
build_web_compilers >=0.4.0
dev_test >=0.13.0
logging any 0.11.3+2
stack_trace any
test >=1.2.0