blockchain-in-javascript

Installation

npm i blockchain-in-javascript --save 

// require
const blockChainInJavaScript = require("blockchain-in-javascript")

// initialize Blockchain class
const BlockChainClass = blockChainInJavaScript.BlockChain;
const blockChainObject = new BlockChainClass();

// for insertion
const insertBlock = blockChainInJavaScript.createBlock;

// for editing
const editBlock = blockChainInJavaScript.editBlock;

Inserting Block

// Insert new block in the chain
// pass object of blockChain class, data[string], difficulty[1-18] 
// More difficulty more time it will take to mine the block 
insertBlock(blockChainObject,"data",4)

Editing Block

// Edit any block
// Pass the index of the block in the chain to be edited,blockChain object, new data [string]

editBlock(1,blockChainObject,"new Data",4);

Get chain

// Get list of all  blocks in the chain currently
var chain=blockChainObject.getChain();

Check if Chain is valid

// This will return a list with values 1 and 0 
// (1=> block is valid), (0=> some one altered the block hence prev hash do not match)
var isChainValid = blockChainObject.isChainValid();

Live Demo

  https://simple-blockchain-in-javascript.surge.sh/

Full code

const blockChainInJavaScript = require("blockchain-in-javascript")
const BlockChainClass = blockChainInJavaScript.BlockChain;
const insertBlock = blockChainInJavaScript.createBlock;
const editBlock = blockChainInJavaScript.editBlock;

// initialize block chain class
const blockChainObject = new BlockChainClass();

// Get list of all  blocks in the chain currently
var chain=blockChainObject.getChain();

// Insert new block in the chain
// pass object of blockChain class, data[string], difficulty[1-18] 
// More difficulty more time it will take to mine the block 
insertBlock(blockChainObject,"data",4)

// Edit any block
// Pass the index of the block in the chain to be edited,blockChain object, new data [string]

editBlock(1,blockChainObject,"new Data",4);

// This will return a list with values 1 and 0 
// (1=> block is valid), (0=> some one altered the block hence prev hash do not match)
var isChainValid = blockChainObject.isChainValid();

License

MIT License

Copyright (c) 2019 sarthak sadh

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.