![](https://steemit-production-imageproxy-thumbnail.s3.amazonaws.com/U5dr39ueYKQ5NncNC74qs7hkFTBfyS3_1680x8400)

#### What Will I Learn?

- Build Auto Follow Bot that follows by trending tag every 5 minutes

#### Requirements

- Node.JS, [Here](https://nodejs.org/en/)
 - Steem Package (Install: `npm install steem --save`)

#### Difficulty
- Basic

#### Tutorial Contents
In this tutorial, you will learn how to make auto follow bot that follows every 5 minutes users by trending tag.

#### Curriculum

- [SteemJS #1](https://utopian.io/utopian-io/@lonelywolf/steem-js-tutorials-1-basics-validating-wif-key)
- [NodeJS #1](https://utopian.io/utopian-io/@lonelywolf/nodejs-tutorials-1-creating-a-static-site-node-js)

#### The Tutorial
first, we want a function to make the follow,
create a function called `AutoFollow`, we need the function to set a timer for every 5 minutes.

```
function AutoFollow(name, tag, wif, limit){

}
```

`name` - the follower username, the username which sends the follow.

`tag` - the tag to get the posts from.

`wif` - the private posting wif key to send the follow.

`limit` - the limit number of the posts.

now let's get the posts and make a loop
```
  steem.api.getDiscussionsByTrending({tag: tag, limit: limit}, function(err, result){
  if(!!err)
  throw err;
  result.forEach(function(row){

  });
```

`getDiscussionsByTrending` - this function will give the recent trending posts.

`tag` - the tag we get the posts from.

`limit` - the limit of the posts we get.

`result.forEach` - making a loop for the posts.

now we need some variables and a json variable
```
  var follower = name;
  var following = row.author;
  var json = JSON.stringify(
  ['follow', {
  follower: follower,
  following: following,
  what: ['blog']
  }]);
```

`follower` - the follower username, the user who sends the follow.

`following` - the user you going to follow.

`json` - json variable for the follow function.

if we done all correctly just broadcast the follow with `customJson` function

```
  steem.broadcast.customJson(wif, [], [follower], 'follow', json, function(err, result) {
  console.log(err, result);
  });
```

`wif` - the wif private posting key.

`follower` - the follower name (you).

`follow` - the role of the customJson function.

`json` - the json variable that contains the follower name, following name and the type of blog.

now we want to send the function every 5 minutes (or any time else)

```
setTimeout(function(){AutoFollow("lonelywolf", "dtube", "XXXX", 1)}, 5*60*1000);
```

`lonelywolf` - the username.

`dtube` - the tag.

`XXX` - wif key (private posting key).

`1` - the limit of posts.

`5*60*1000` - 5, minutes. 60, seconds. 1000, milliseconds.

the full function code
```
function AutoFollow(name, tag, wif, limit){
  steem.api.getDiscussionsByTrending({tag: tag, limit: limit}, function(err, result){
  if(!!err)
  throw err;
  result.forEach(function(row){
  var follower = name;
  var following = row.author;
  var json = JSON.stringify(
  ['follow', {
  follower: follower,
  following: following,
  what: ['blog']
  }]);
  steem.broadcast.customJson(wif, [], [follower], 'follow', json, function(err, result) {
  console.log(err, result);
  });
  });
  setTimeout(function(){AutoFollow("lonelywolf", "dtube", "XXX", 1)}, 5*60*1000);
  });
}
```

if we done all correctly we can send the function when the script starts

```
AutoFollow("lonelywolf", "dtube", "XXX", 1);
```

and we will see that result

![image.png](https://cdn.utopian.io/posts/f77ecdfa5252f9668524ecb1f8980c12c79dimage.png)

(the script run for 15 minutes now, so I followed 3 users already)

text result
```
null { id: 'f634e79b3264ab96f2942ad4f03442e97fcf3425',
  block_num: 21432131,
  trx_num: 24,
  expired: false,
  ref_block_num: 1835,
  ref_block_prefix: 914276676,
  expiration: '2018-04-10T02:19:15',
  operations: [ [ 'custom_json', [Object] ] ],
  extensions: [],
  signatures:
  [ '20337c080cca9b4be0d4fff05eb34974579f90ac28b50d1c7609df14df13737e9710336ebd5536e6e9e900eebe4772e50abdfa73528d808207886f39c5d0b734dd' ] }
null { id: '89b09e78962e84f301b115ac149335a4f2f68468',
  block_num: 21432231,
  trx_num: 58,
  expired: false,
  ref_block_num: 1937,
  ref_block_prefix: 3893587431,
  expiration: '2018-04-10T02:24:18',
  operations: [ [ 'custom_json', [Object] ] ],
  extensions: [],
  signatures:
  [ '207267a2841addf839e203c1b3135ba0b08726fd5f16fd20b08f71f8b850fdee3947a9478661a107ad76bc00835867dee8a7c506f8e71562c7b910fdaa61380975' ] }
null { id: 'b1632efd8e4d88ec812d127ed938a667a8211c00',
  block_num: 21432338,
  trx_num: 10,
  expired: false,
  ref_block_num: 2043,
  ref_block_prefix: 980857,
  expiration: '2018-04-10T02:29:36',
  operations: [ [ 'custom_json', [Object] ] ],
  extensions: [],
  signatures:
  [ '2013c002f7e4d0ba7f2d8ba32fbb3d41a7374095ebf6e84becf31accc2c2dbe4825ee60ae981b3a2f97812ffe1ecca483ab6968a08aee787220b73156e46245486' ] }
```

steemd results

![image.png](https://cdn.utopian.io/posts/692be62519018808d2754d26db9f152e00ecimage.png)

(tested few times so there is more then 3 follows)



<br /><hr/><em>Posted on <a href="https://utopian.io/utopian-io/@lonelywolf/bot-build-2-auto-follow-bot">Utopian.io - Rewarding Open Source Contributors</a></em><hr/>