json-database-lite

A small, simple database that is locally stored in a JSON file.

Usage

Here is how to get started with your project.

Importing

To use this in your project, import the module with const JSONDatabaseLite = require('json-database-lite');, and create a new object with const database = new JSONDatabaseLite();. If it hasn't been created already, it will initialize a new database.json file in your root project folder. This action will load the database into your server's memory and allow for direct access without closing the file.

Methods

Since the database is a JSON file, most of the operations (searching, deletion, etc.) can be done natively with Node.js. However, there are a couple of built-in methods for accessing data.

Modifying directly

database.database.key = "value"; - This modifies the database, but doesn't save the value to the file.

Saving

database.write(); - This line must be called after each modification in order to save the changes to the database.json file.

Appending with a unique ID

database.append(data, position) - This creates a unique key and sets it to the value provided in data. If an optional position argument is provided, the database will append the value at the point of insertion, even if the key does not exist or if the point is deeply nested. Otherwise, the value will be appended at the root.

An example of calling this function would be database.append("My value", "point.nested.mydata") and would produce a result of database.point.nexted.mydata[UNIQUELYGENERATEDID]:"My value".

Finding multiple values

database.find(keyArg, valueArg) - This will perform a search across the entire database for nested objects that match the key-value pair. The results will be returned either as an array if the objects are found, or null if no objects are found.

Finding one value

database.findOne(keyArg, valueArg) - This will perform a search across the entire database for one nested object that matches the key-value pair. The results will be returned either as the object itself, or null if no objects are found.

Deleting a value

database.deleteObj(keyArg, valueArg) - This will perform a search for the key-value pair, and delete the object if a match is found. This will return the object, or null.