ZangoDB is a MongoDB-like interface for HTML5 IndexedDB that supports most of the familiar filtering, projection, sorting, updating and aggregation features of MongoDB, for usage in the web browser.

let db = new zango.Db('mydb', { people: ['age'] }); let people = db.collection('people'); let docs = [ { name: 'Frank', age: 20 }, { name: 'Thomas', age: 33 }, { name: 'Todd', age: 33 }, { name: 'John', age: 28 }, { name: 'Peter', age: 33 }, { name: 'George', age: 28 } ]; people.insert(docs).then(() => { return people.find({ name: { $ne: 'John' }, age: { $gt: 20 } }).group({ _id: { age: '$age' }, count: { $sum: 1 } }).project({ _id: 0, age: '$_id.age' }).sort({ age: -1 }).forEach(doc => console.log('doc:', doc)); }).catch(error => console.error(error));

Which outputs:

doc: { count: 3, age: 33 } doc: { count: 1, age: 28 } 

ZangoDB is available as an npm package, and the web-browser build can be downloaded here or embedded:

<script src="https://unpkg.com/zangodb@latest/dist/zangodb.min.js"></script>

For certain web browsers, such as Internet Explorer, the Babel polyfill is required and must be loaded before ZangoDB:

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-polyfill/6.23.0/polyfill.min.js"></script>

ZangoDB then can be accessed using the global variable zango.

To install ZangoDB for usage with node:

$ npm install zangodb 

To install ZangoDB using Bower:

$ bower install zangodb 

In each case, an implementation of IndexedDB is required. For environments without a native implementation of IndexedDB, Fake IndexedDB can be used:

global.indexedDB = require('fake-indexeddb'); global.IDBKeyRange = require('fake-indexeddb/lib/FDBKeyRange');

The following filter operators are supported: $and, $or, $not, $nor, $eq, $ne, $gt, $gte, $lt, $lte, $in, $nin, $elemMatch and $exists.

Expression operators can be used in combination with the group and projection operators.

The following expression operators are supported: $literal, $add, $subtract, $multiply, $divide, $mod, $abs, $ceil, $floor, $ln, $log10, $pow, $sqrt, $trunc, $concat, $toLower, $toUpper, $concatArrays, $dayOfMonth, $year, $month, $hour, $minute, $second, and $millisecond.

The following update operators are supported: $set, $unset, $rename, $inc, $mul, $min, $max, $push, and $pop.

The following group operators are supported: $sum, $avg, $min, $max, $push, and $addToSet.

The following aggregation pipeline stages are supported: $match, $project, $group, $unwind, $sort, $skip, and $limit.

MIT, please view the LICENSE file.