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Readme

EveloDB

An awesome local database management system with nodejs. Made by Evelocore. With B-tree Operations.

📚 Full Documentation

Requirements

Node.js

📥 Installation
🔢 Comparison Operators
⚙️ Operations
🔍 Get Query Result
🧠 AI Analyse
📝 Use BSON binary encoded
📁 Store Files
🖼️ Image Utilities
🔐 Encryptions
🔄 Change Config
💡 Features
📈 Changelog
🌍 EveloDB Server

📥 Installation

Npm Install

npm i evelodb

Import

const eveloDB = require('evelodb')
const db = new eveloDB();

Optional Configuration

let db
try {
    db = new eveloDB({
        directory: './evelodatabase', // ./evelodatabase/users.db
        extension: 'db', // users.db
        encryption: '<encryption_method>',
        encryptionKey: '<encryption_key>',
        noRepeat: false,
        autoPrimaryKey: true,
        encode: 'bson'
    })
} catch (err) {
    console.error('Init Error:', err.message);
    process.exit(1);
}

Configuration Parameters

Parameter	Type	Description	Example	Default
`directory`	string	Where database files are stored	`'./database'`	`'./evelodatabase'`
`extension`	string	File extension for DB files	`'db'`, `'edb'`	`'json'`
`encode`	string	Data encoding system (JSON / BSON)	`'json'` `'bson'`	`json`
`objectId`	boolean	Primary key type (ObjectId / String)	`true`	`false`
`encryption`	string	Encryption algorithm	`'aes-256-cbc'`	`null`
`encryptionKey`	string	Key (length varies by algorithm)	64-char hex for AES-256	`null`
`noRepeat`	boolean	Reject duplicate data	`true`/`false`	`false`
`autoPrimaryKey`	string	Auto-create unique IDs (_id)	`true`/`false`/`'id'`	`true`

autoPrimaryKey
- true: Auto-create unique IDs (_id) for each document
- false: No auto-create
- string: Put your own id field name (e.g., 'id', 'key')

🔢 Comparison Operators

Used to filter with conditions like greater than, less than, equal, etc.

Operator	Description	Example
`$eq`	Equal	`{ age: { $eq: 25 } }`
`$ne`	Not equal	`{ age: { $ne: 25 } }`
`$gt`	Greater than	`{ age: { $gt: 25 } }`
`$gte`	Greater than or equal	`{ age: { $gte: 25 } }`
`$lt`	Less than	`{ age: { $lt: 25 } }`
`$lte`	Less than or equal	`{ age: { $lte: 25 } }`
`$in`	Matches any in an array	`{ status: { $in: ["active", "pending"] } }`
`$nin`	Not in array	`{ status: { $nin: ["inactive"] } }`

⚙️ Operations

Create

// Structure
db.create('collection', {
    key: 'value'
})

// Example
db.create('collection', {
    username: 'john',
    name: {
        firstname: 'John',
        lastname: 'Doe'
    },
    email: 'example@gmail.com'
})

{ success: true }

if autoPrimaryKey: true

{ success: true, _id: 'mcbdb90d-ajl393' }

if noRepeat: true and repeating data is detected

{ err: 'Duplicate data - record already exists (noRepeat enabled)', code: 'DUPLICATE_DATA' }

Update Item

// Structure
db.edit('collection', 
    { key: 'value' },     // find condition
    { key: 'new_value' }  // new data
)

// Example
db.edit('accounts', 
    { username: 'john' },
    {
        name: 'John Smith',
        email: 'updated@gmail.com'
    }
)

{ success: true, modifiedCount: 1 }

if find condition not matched

{ err: 'No matching records found', code: 'NO_MATCH' }

if noRepeat: true and repeating data is detected

{ err: 'Edit would create duplicate data (noRepeat enabled)', code: 'DUPLICATE_DATA' }

Delete

// Structure
db.delete('collection', {
    key: 'value'
})

// Example
db.delete('users', {
    name: 'John Doe'
})

// Example with options
console.log(db.delete('users', {
    age: { $lt: 18 }
}))

{ success: true, deletedCount: 2 }

Find

// Structure
const result = db.find('collection', {
    key: 'value'
}).all()

// Example
const user = db.find('users', {
    name: 'john',
    age: { $gt: 18 }
}).all()
console.log(user)

[
  {
    name: 'john',
    age: 19,
    email: 'example@gmail.com'
  },
  {
    name: 'john',
    age: 24,
    email: 'example@gmail.com'
  }
]

No result found

[]

Find One

// Structure
const result = db.findOne('collection', {
    key: 'value'
})

// Example
const user = db.findOne('users', {
    username: 'banana'
})
console.log(user)

{
    username: 'banana',
    name: 'Test User',
    email: 'example@gmail.com'
}

No result found

null

Search

// Structure
const result = db.search('collection', {
    key: 'partial_value'
}).all()

// Example
const user = db.search('users', {
    name: 'Joh'
}).all()

// Example with options
const user = db.search('users', {
    name: { $regex: '^joh', $options: 'i' }  // Matches names starting with "joh", case-insensitive
}).getList(0, 20)

console.log(user)

[
  {
    name: 'John Doe',
    age: 25,
    email: 'example@gmail.com'
  }
]

Check Existence

// Structure
const exists = db.check('collection', {
    key: 'value'
})

// Example
const exists = db.check('accounts', {
    username: 'evelocore'
})

console.log(exists)

true

Count Items

// Structure
const count = db.count('collection')

// Example
const count = db.count('accounts')
console.log(count)

{
    success: true,
    count: 25
}

Get from all

// Structure
const result = db.get('collection').all()

// Example
const users = db.get('accounts').getList(10, 20)
console.log(users)

Drop Collection

// Structure
db.drop('collection')

// Example
db.drop('accounts')

Write plain data into collection

// Structure
const result = db.writeData('collection', data)

// Example
const users = db.writeData('accounts', [
  { id: 1, name: 'John Doe' },
  { id: 2, name: 'Blue Bird' },
])

const users = db.writeData('appdata', {
    name: 'EveloDB',
    description: 'An awesome local DBMS with nodejs',
    author: 'Evelocore'
})
// Also can maintain object using writeData() and readData()

Read plain data from collection

// Structure
const result = db.readData('collection')

// Example
const appData = db.readData('appdata')
console.log(appData)

🔍 Get Query Result

This is a wrapper that provides chainable methods for working with query results in eveloDB. It enables pagination, sorting, and other data manipulation operations on query results.

Overview

The Query Result returned by the following eveloDB methods:

db.find(collection, conditions)
db.search(collection, conditions)
db.get(collection) when data is an array

Examples

getList

Implements pagination by returning a subset of results.

// Get first 10 users
const firstPage = db.find('users', { status: 'active' }).getList(0, 10);

// Get next 10 users (pagination)
const secondPage = db.find('users', { status: 'active' }).getList(10, 10);

// Get 5 users starting from index 20
const customPage = db.find('users', { status: 'active' }).getList(20, 5);

count

Returns the total number of items in the result set.

// Get total count of active users
const totalActiveUsers = db.find('users', { status: 'active' }).count();

// Get count of search results
const searchCount = db.search('products', { name: 'phone' }).count();

// Use for pagination info
const results = db.find('orders', { status: 'pending' });
const total = results.count();
const currentPage = results.getList(0, 20);
console.log(`Showing ${currentPage.length} of ${total} results`);

sort

Sorts the results using a comparison function.

// Sort by name (ascending)
const sortedByName = db.find('users', { status: 'active' })
    .sort((a, b) => a.name.localeCompare(b.name))

// Sort by age (descending)
const sortedByAge = db.find('users', { status: 'active' })
    .sort((a, b) => b.age - a.age)
    .getList(0, 20);

// Sort by date (newest first)
const sortedByDate = db.find('posts', { published: true })
    .sort((a, b) => new Date(b.createdAt) - new Date(a.createdAt))
    .getList(0, 10);

Method Chaining

One of the key features of QueryResult is method chaining, allowing you to combine operations:

const db = new eveloDB();

// Chain multiple operations
const result = db.find('products', { category: 'electronics' })
    .sort((a, b) => b.price - a.price)  // Sort by price (high to low)
    .getList(10, 5);                    // Get items 11-15

// Complex chaining example
const topExpensiveProducts = db.search('products', { name: 'laptop' })
    .sort((a, b) => b.price - a.price)  // Sort by price descending
    .getList(0, 3);                     // Get top 3 most expensive

// Get count after sorting (count remains the same)
const sortedResults = db.find('users', { role: 'admin' })
    .sort((a, b) => a.name.localeCompare(b.name));
    
const totalCount = sortedResults.count();        // Total admins
const firstPage = sortedResults.getList(0, 10);  // First 10 sorted admins

🧠 AI Analyse

EveloDB integrates with Google's Generative AI to provide intelligent analysis of your collections.

AI Analysis Features

Analyze collection data using natural language queries
Get AI-powered insights from your datasets
Filter results before analysis
Direct data input option

Parameters

Parameter	Type	Required	Description
`collection`	string	No*	Collection name to analyze (*required if `data` not provided)
`filter`	object	No	Filter with comparison operators to apply before analysis
`data`	array	No*	Direct data input (*required if `collection` not provided)
`model`	string	Yes	Gemini model to use (e.g., "gemini-pro", "gemini-2.5-flash")
`apiKey`	string	Yes	Your Google Generative AI API key
`query`	string	Yes	Natural language query for analysis (max 1024 chars)

Example

const res = await db.analyse({
    collection: 'users',
    filter: { age: { $gt: 18 } },
    //data: data,
    model: 'gemini-2.5-flash',
    apiKey: 'GEMINI_API_KEY',
    query: 'Find users with potentially offensive bios'
})

console.log(res)

Response:

{
  success: true,
  response: {
    indexes: [ 1, 2, 4 ],
    reason: "The selected users have bios containing explicit profanity ('F****!'), vulgar expressions ('B****!'), or derogatory/insulting remarks ('This game is trash ****!'), which are all considered potentially offensive.",
    message: 'Offensive content was identified by the presence of strong expletives, common vulgarisms, or direct negative attacks/insults aimed at others or products.',
    data: [ [Object], [Object], [Object] ]
  }
}

📝 Use BSON encoded

EveloDB can handle both JSON and BSON encoded data. Here's how to use BSON encoded data with eveloDB:
JSON use string for keys, while BSON use ObjectId for keys.
BSON (Binary JSON) is the optimal format for storing and maintaining database records when human readability is not required.

Configuration with BSON encoding

const eveloDB = require('evelodb')
let db
try {
    db = new eveloDB({
        directory: './evelodatabase',
        extension: 'db', // default 'bson'
        encode: 'bson',
    })
} catch (err) {
    console.error('Init Error:', err.message);
    process.exit(1);
}

encode: 'bson' for BSON encoding
encode: 'json' for JSON encoding (default)

Summery

JSON is faster than BSON when doesn't use encryption.
If you want unreadable database, use BSON

📁 File Store

File Management – Read, write, and delete files easily.
Image Utilities – Special functions to process images (resize, compress, transform, ...).
Lightweight & Fast – No external database required, works directly with the file system.

Store image buffer as image.jpg

db.writeFile('image.jpg', imageBuffer)

{ success: true }

Read image.jpg

db.readFile('image.jpg')

{
  success: true,
  data: <Buffer ff d8 ff e0 00 10 ...>
}

Delete profile.pdf

db.deleteFile('profile.pdf')

{ success: true }

🖼️ Image Utilities

Resize by pixels or max width/height
Adjust brightness & contrast
Apply filters (invert, mirror, flip)
Control quality and output format
Return as Buffer or Base64

⚙️ Parameters

Parameter	Type	Default	Description
`returnBase64`	Boolean	`true`	If `true`, returns a Base64 Data URL. Otherwise returns a `Buffer`.
`quality`	Number	`1`	Output quality (0.1 – 1). Lower values reduce size.
`pixels`	Number	`0`	Maximum total pixels. `0` = keep original size. Useful for scaling down large images.
`maxWidth`	Number	`null`	Maximum width in pixels.
`maxHeight`	Number	`null`	Maximum height in pixels.
`blackAndWhite`	Boolean	`false`	Converts the image to grayscale.
`mirror`	Boolean	`false`	Flips the image horizontally.
`upToDown`	Boolean	`false`	Flips the image vertically.
`invert`	Boolean	`false`	Inverts image colors.
`brightness`	Number	`1`	Brightness multiplier (`0.1 – 5`). `1` = original.
`contrast`	Number	`1`	Contrast multiplier (`0.1 – 5`). `1` = original.

Read image.jpg with preset config

(async () => {
  const result = await db.readImage("image.jpg", {
    returnBase64: true,
    quality: 0.8,
    pixels: 500000,
    blackAndWhite: false,
    mirror: false,
    upToDown: false,
    invert: false,
    brightness: 1,
    contrast: 1
  });

  console.log(result)
})()

{
  success: true,
  data: "data:image/jpeg;base64,/9j/4AAQSk...",
  metadata: {
    filename: "image.jpg",
    extension: ".jpg",
    originalSize: 254399,
    processingApplied: {
      resized: true,
      qualityReduced: true,
      blackAndWhite: true,
      mirrored: true,
      flippedVertical: false,
      inverted: false,
      brightnessAdjusted: true,
      contrastAdjusted: true
    }
  }
}

🔐 Encryptions

Configuration

const eveloDB = require('evelodb')
let db
try {
    db = new eveloDB({
        directory: './evelodatabase',
        extension: 'db',
        encryption: '<encryption_method>',
        encryptionKey: '<encryption_key>',
    })
} catch (err) {
    console.error('Init Error:', err.message);
    process.exit(1);
}

Encryption Methods

aes-128-cbc (16 bytes) - 32 hex characters
aes-192-cbc (24 bytes) - 48 hex characters
aes-256-cbc (32 bytes) - 64 hex characters
aes-128-gcm (16 bytes) - 32 hex characters
aes-256-gcm (32 bytes) - 64 hex characters

Example Configuration

const eveloDB = require('evelodb')
let db
try {
    db = new eveloDB({
        extension: 'db',
        encryption: 'aes-256-cbc',
        encryptionKey: '0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef' // 64 hex characters
    })
} catch (err) {
    console.error('Init Error:', err.message);
    process.exit(1);
}

Generate Hex Key

Using EveloDB inbuild method

const length = 32 // 32, 48, 64
const key = db.generateKey(length)
console.log(key)

Using Crypto JS

const crypto = require('crypto');
const key = crypto.randomBytes(16).toString('hex'); // 32 hex chars
console.log(key);

🔄 Change Configuration

Note: If you are using the config, you can use the same instance of the database.
If you change the encryption / encryptionKey / extension or directory, your current db files and data was initialized with the old config will be corrupted and cannot be read.
Solution for change configuration, use changeConfig() method. It can change your current db config to new config and continue normally after initialize again with new config .
Eg: Converting my current aes-256-cbc encrypted .json database from './evelodatabase' to aes-128-cbc and .db with new key and './database' directory.

const res = db.changeConfig({
    from: {
        directory: './evelodatabase',
        extension: 'json',
        encryption: 'aes-256-cbc',
        encryptionKey: '0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef'
    },
    to: {
        directory: './database',
        extension: 'db',
        encryption: 'aes-128-cbc',
        encryptionKey: '0123456789abcdef0123456789abcdef' // 32 hex characters
    },
    collections: ['users', 'accounts'] // if not set collections, convert all collections
})
console.log(res)
// { success: true, converted: 2, failed: 0 }

// Initialize again
try {
    db = new eveloDB({
        directory: './database',
        extension: 'db',
        encryption: 'aes-128-cbc',
        encryptionKey: '0123456789abcdef0123456789abcdef'
    });
} catch (err) {
    console.error('Re-init Error:', err.message);
}

If you remove encryption and encryptionKey parameters in to object, it will remove the encryptions in your database and continue with json string.

const res = db.changeConfig({
    from: {
        encryption: 'aes-256-cbc',
        encryptionKey: '0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef'
    },
    to: {}
})

💡 Features

✓ JSON-based storage
✓ BSON-based storage
✓ Powerful filtering support
✓ AES Encryption
✓ Custom path and extension
✓ B-Tree indexing
✓ Fast retrieval
✓ No Repeat option
✓ Auto Primary Key option
✓ File Store
✓ Image Utilities

📈 Changelog

1.3.9
- Unlimited collection size in BSON
- File Store
- Read images utilities
1.2.9
- Comparison Operators
- Improve find, search, update, delete
1.2.8
- No Repeat option
- Auto Primary Key option
- Add custom key for primary key
1.2.6
- Fixed some bugs
1.2.5
- BSON-based storage
- Binary Serialized Object Notation with EveloDB
1.2.3
- Improve AES Encryption for JSON
1.2.1
- AES Encryption for JSON
1.1.1
- Custom path
- Custom extension
1.0.9
- Improve B-Tree Operations
1.0.6
- B-Tree indexing system

🌍 EveloDB Server

EveloDB Server is a lightweight, powerful, and flexible server built on top of the local BSON-based DBMS eveloDB. It provides an all-in-one solution to manage local databases with a user-friendly UI and secure backend system.

🚀 Features

📦 Standalone Application
- Easily install and run as a desktop/server app.
🖥️ Modern UI Interface
- Manage databases and collections through a clean web interface.
🗂️ Customizable Database Properties
- Each database includes: name, username, key, colour, and icon.
🔐 Secure Login System
- Easy and secure login with key-based access.
👥 User Management
- Supports admin/user roles with access control.
✏️ Code & Template Editor
- Edit collection templates directly in the browser.
🌐 CORS Origin Control
- Manage which frontend origins can access your databases.
📤📥 Import/Export Collections
- Backup or import collections as JSON or BSON files.
🧩 eveloDB Integration
- Fully powered by eveloDB and accessible via evelodb-global npm package.

📢 Stay Connected

Developed by K.Prabhasha

evelodb