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manage accounts with leveldb

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To create a user, we can just do:

var accountdown = require('accountdown');
var level = require('level');
var db = level('./users.db');
var users = accountdown(db, {
    login: { basic: require('accountdown-basic') }
var opts = {
    login: { basic: { username: 'substack', password: 'beep boop' } },
    value: { bio: 'beep boop' }
users.create('substack', opts, function (err) {
    if (err) return console.error(err);

The string we gave to users.create() need not necessarily match the username credential. You might want to use a uid integer for example. In either case you will get implicitly encforced unique names because if a username already exists the users.create() call will fail even if the id is available and likewise if an id is unavailable but a username is available.


To verify a credential (in this case, using accountdown-basic):

var accountdown = require('accountdown');
var level = require('level');
var db = level('./users.db');
var users = accountdown(db, {
    login: { basic: require('accountdown-basic') }
var creds = { username: 'substack', password: 'beep boop' };
users.verify('basic', creds, function (err, ok, id) {
    if (err) return console.error(err)
    console.log('ok=', ok);
    console.log('id=', id);


var accountdown = require('accountdown')

var users = accountdown(db, opts)

Create a new account instance users given a leveldb database handle db and some options opts.

opts can be:

  • opts.login - map of type names to login plugin functions
  • opts.valueEncoding - value encoding to use, 'json' by default

users.create(id, opts, cb)

Create a user by an id.

users.verify(type, creds, cb)

Challenge credentials creds for a login type.

cb(err, ok, id) fires with an error or the boolean verify status ok - true for challenge success and false for challenge failure. On success, the id associated with challenge credentials, cred is defined.


Return a readable object stream of row objects with row.key set to the user id of each user in the account system.

users.get(id, cb)

Get the value for a username by id as cb(err, value).

users.put(id, value, cb)

Put a value for a username id. The username id must already exist.

cb(err) fires with any errors.

users.remove(id, cb)

Remote an account by id, including all login information for that user id.

cb(err) fires with any errors.

users.register(type, plugin)

Register a login plugin at a string name type.

users.addLogin(id, type, creds, cb)

Add a login for id of type using the credentials creds.

cb(err) fires with any errors.

var s = users.listLogin(id)

Return a readable object stream s of rows with row.key set to each string login type present for the user at id. For example:

{ key: 'basic' }
{ key: 'rsa' }

users.removeLogin(id, type, cb)

Remove a login for id by its type.

cb(err) fires with any errors.

login plugins

Login plugins such as accountdown-basic should export a single function that will be created with db and prefix arguments and should return an object with .verify() and .create() functions:

module.exports = function (db, prefix) {
    return {
        verify: function (creds, cb) {
            // calls cb(err, success, id) 
        create: function (id, creds) {
            // returns an array of batch rows 

plugin.verify(creds, cb)

Check whether creds are valid login credentials. cb(err, success, id) fires with any errors, the success as a boolean, and the user id.

plugin.create(id, creds)

Return an array of rows to batch insert if and only if all the keys do not already exist using level-create-batch.


With npm do:

npm install accountdown