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    This library is a FeathersJS database adapter for HarperDB - an LMDB/NodeJS-based, high-scale, database. It uses a combination of the raw HarperDB RESTful endpoints and KnexJS-translated queries through HarperDB's subset of supported SQL commands. It also uses Harperive for authentication, promise management, and connectivity.

    npm install --save feathers-harperdb

    Important: feathers-harperdb implements the Feathers Common database adapter API and querying syntax.



    const service = require('feathers-harperdb');
    app.use('/messages', service({


    • name (required) - The name of the table
    • config (required) - Usually set in config/{ENV}.json. See "Connection Options" below
    • client (optional) - The Harperive Client, can be manually overriden and accessed
    • id (optional, default: id) - The name of the id field property.
    • events (optional) - A list of custom service events sent by this service
    • paginate (optional) - A pagination object containing a default and max page size
    • multi (optional) - Allow create with arrays and update and remove with id null to change multiple items. Can be true for all methods or an array of allowed methods (e.g. [ 'remove', 'create' ])
    • whitelist (optional) - A list of additional query parameters to allow (e..g [ '$regex', '$geoNear' ]). Default is the supported operators
    • sortField (optional, default: __createdtime__) - By default all objects will be sorted ASC by created timestamp, similar to sorting by Integer auto-incremented id in most feather SQL operations
    • sortDirection (optional, default: asc) - The default sort direction, can be one of [ 'asc', 'desc' ]
    • limit (optional, default: 5000) - The max number of objects to return without pagination, will be overriden by pagination settings
    • sync (optional, default: true ) - Setting true will create schema and table on load as part of the service.setup() function run by FeathersJS
    • force (optional, default: false) , Settign true will delete the schema on setup, starting with fresh database with every boot, much like Sequelize's forceSync.

    Connection Options: The connection options are passed in as a config object inside the options object (i.e. harper({ config: { ...connection_options } }))

    • schema (required) - The name of the schema (i.e. DB-equivalent) in the HarperDB instance
    • harperHost (required) - The location of the Harper Host
    • username (required) - The username to connect with
    • password (required) - The password to connect with
    • table (optional) - The name of the table referenced by the service, defaults to name, but can be overriden by setting config.table

    These can also be set via a "harperdb" configuration field in the Feathers config/{ENV}.json:

        "harperHost": "http://localhost:9925",
        "username": "admin",
        "password": "password",
        "schema": "test"

    Setting up Service

    To set up your service, your service class.js and service.js files should look something like this:

    const { Service } = require('feathers-harperdb');
    exports.Books = class Books extends Service{
      constructor(options, app) {
          name: 'books'
    const { Books } = require('./books.class');
    const hooks = require('./books.hooks');
    module.exports = function (app) {
      const options = {
        paginate: app.get('paginate'),
        config: {
          table: 'books'
      app.use('/books', new Books(options, app));
      const service = app.service('books');


    In addition to the common querying mechanism, this adapter also supports direct NoSQL submissions via the Harperive client like this:

    let service = app.service('books')
    await service.client.insert({
      table: this.table,
      records: [
          user_id: 43,
          username: 'simon_j',
          first_name: 'James',
          middle_name: 'J.',
          last_name: 'Simon'
    .then((res) => console.log(res))
    .catch((err) => console.log(err));

    You can also use Harperive's generic execution option like so:

    const options = {
      operation: 'harperdb_operation',
      //other fields...
    // Promise
    let service = app.service('books')
    await service.client.executeOperation(options)
      .then((res) => console.log(res))
      .catch((err) => console.log(err));


    npm i feathers-harperdb

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