fakerdb

Generate an unlimited stream of JSON schema instances using json-schema-faker, faker, chance and insert the data into a supported database, e.g.: nedb, mongodb, postgres, mssql.

Getting Started

npm install
 
# run docker container
docker-compose up -d
 
npm test
 
# stop docker container
docker-compose down

Test Results and Performance

Test Environment

• Intel® Core™ i7-3520M CPU @ 2.90GHz × 4
• 7.5 GiB
• Linux 64 bit

JSON schema

// person.json
{
  "type": "object",
  "properties": {
    "name": {
      "type": "string",
      "faker": "name.findName"
    }
  },
  "required": [
    "name"
  ]
}

Insert 10^5 Records

Insert 10^6 Records

Insert 10^7 Records

API Usage

Install

npm i fakerdb

Stream to STDOUT

// examples/faker-stdout.js
 
var { replay, jsf } = require('fakerdb')
, faker = require('faker')
, jsonSchemaFaker = require('json-schema-faker')
, path = require('path');
 
jsonSchemaFaker.extend('faker', () => faker);
 
const SCHEMA_OBJ = {
  type: 'object',
  properties: {
    name: {
      type: 'string',
      faker: 'name.findName'
    }
  },
  required: [
    'name'
  ]
};
 
replay(SCHEMA_OBJ, { replay: 2 })
  .pipe(jsf(jsonSchemaFaker))
  .pipe(process.stdout);
 
const SCHEMA_FILE = path.join(__dirname, './schema/person.json');
replay(SCHEMA_FILE, { replay: 2 })
    .pipe(jsf(jsonSchemaFaker))
    .pipe(process.stdout);
 

Stream to file with nedb

// examples/faker-nedb.js
 
let { generate }  = require('fakerdb')
  , Datasource = require('nedb')
  , db = new Datasource({ filename: 'faker.db', autoload: true })
  , path = require('path');
 
const REPLAY = 1000;
const SCHEMA  = path.join(__dirname, './schema/person.json');
const OPTS = { replay: REPLAY, insert: { blockSize: 1000 } };
 
generate(db, SCHEMA, OPTS);

Stream to database

• PostgreSQL
• MongoDb

fakerdb CLI

Use

npm i -g fakerdb
fakerdb --help

Custom Faker Example

Create Standard Normal Distributed Samples

• JSON Schema Example
• Custom Faker Example
• Custom Json Schema Faker

Use

cd examples/faker
fakerdb g -r 200000 -i person.json -f custom-jsf.js -b 1000 -o people.db 

References

• json-schema-faker
• faker
• chance
• probability-distributions
• nedb
• mongodb
• knex
• postgres
• mssql