How To Create Auto-Transfer Script With Steem.js JavaScript Library (Steem.js #4)

Auto-Transfer Script

Repository

https://github.com/steemit/steem-js

What Will I Learn?

In this tutorial you will learn how to create auto-transfer script. This can be useful if you need to transfer STEEM/SBD at specific time (e.g. Payment for service like VPS server from Privex or loan repayment).

• You will learn how to claim rewards with Steem.js.
• You will learn how to transfer STEEM/SBD with Steem.js.
• You will learn how to schedule script with Node Cron.

Requirements

You need:

• Linux Ubuntu 16.04 VPS (It can be also done in Windows or other Linux but I didn't test this) - Get it at Privex.io for 8$ per month (STEEM & SBD & ETH & BTC & LTC)
• Node.js: sudo apt-get install nodejs
• Node.js package manager npm: sudo apt-get install npm
• Node-Cron: npm install --save node-cron
• Steem.js: npm install steem --save

Difficulty

• Intermediate

Tutorial

First connect to your VPS or open terminal.

Than create file transfer.js: touch transfer.js and open it in text editor: nano transfer.js.

Once you have transfer.js open, set variables steem and cron.

var steem = require('steem');
var cron = require('node-cron');

Now we need to claim rewards. But first we need to check if there are any rewards to claim.

steem.api.getAccounts(['your-account'], function(err, result){
    console.log(err, result)
    let sbdReward = result[0].reward_sbd_balance
    let steemReward = result[0].reward_steem_balance
    let steemPowerInVests = result[0].reward_vesting_balance
})

Don't forget to replace your-account with your Steem username.

This will check if there is any reward to claim and set variables sbdRewards, steemRewards and steemPowerInVests to amount of available amount of SBD/STEEM/VESTS.

Once you know how much rewards you have, you just need to claim them.

steem.broadcast.claimRewardBalance('private-posting-key', 'your-account', steemReward, sbdReward, PowerInVests, function(err, result) {
      console.log(err, result);
    });

This will claim all available rewards. Private posting key and account username need quotes (' ').

Now we need to transfer STEEM/SBD to another account. Let's set variables wif (active key), from (your account), to (another account), amount (amount to 3 decimals and symbol SBD or STEEM), memo (any memo)

var wif = 'your-active-key'
var from = 'my-account'
var to = 'another-account'
var amount = '100.000 SBD'
var memo = 'memo'
steem.broadcast.transfer(wif, from, to, amount, memo, function(err, result) {
 console.log(err, result);
});

This is working script, but you need to run it manually. We want automation!!

Let's use node-cron:

var steem = require('steem');
var cron = require('node-cron');

cron.schedule('* * * * *', function() {
//all code here
}

How to choose time when script will start? Change * * * * * with correct expressions. Use https://crontab.guru/ to create right expression. (e.g. 5 0 * 8 * will run script at 00:05 in August)

Full Code:

var steem = require('steem');
var cron = require('node-cron');

cron.schedule('* * * * *', function() {

steem.api.getAccounts(['your-account'], function(err, result){
            console.log(err, result)
            let sbdReward = result[0].reward_sbd_balance
            let steemReward = result[0].reward_steem_balance
            let steemPowerInVests = result[0].reward_vesting_balance

            steem.broadcast.claimRewardBalance('private-posting-key', 'your-account', steemReward, sbdReward, steemPowerInVests, function(err, result) {
                console.log(err, result);
            });
    })

var wif = 'your-active-key'
var from = 'my-account'
var to = 'another-account'
var amount = '100.000 SBD'
var memo = 'memo'

steem.broadcast.transfer(wif, from, to, amount, memo, function(err, result) {
 console.log(err, result);
});

})

Curriculum

• Vote from Steem.js
• Transfer from Steem.js
• Post from Steem.js

Proof of Work Done

https://github.com/fbslo/Steem.js/blob/master/transfer.js