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## Overview
In this shot, we will learn about the Node thread property `isMainThread`, which is provided by the `worker_threads` library in Node.

The library **`worker_threads`** provides us APIs which let the developer run code in different threads that run parallel to each other.

**`isMainThread`** is a property in the `worker_threads` library which returns a Boolean value:
  
   * `true`: When code is running in the main thread.
   * `false`: When the code is running in the child threads.
 

## Code example 1
We will write simple code which finds if the current code is running in the main thread or not using the property `isMainThread`.

const { Worker, isMainThread } = require('worker_threads');

console.log(isMainThread);

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## Code explanation

* In line 1, we will require and import the property `isMainThread` from the library `worker_threads`.

* In line 3, we will console log the property `isMainThread`, which returns a Boolean value.

## Output:
Here, the output will be `true` because it is the main thread.

const { Worker, isMainThread } = require('worker_threads');

if(isMainThread){
    new Worker(__filename);
}

console.log(isMainThread);

## Code explanation

* In line 1, we will require and import the property `isMainThread` from the library `worker_threads`.

* In line 3, we will create a new thread using `Worker()` and pass the current file. It will re-load the file in the new thread.

* In line 5, we will console log the property `isMainThread`, which returns a boolean value. 

## Output:
In this code example, the output will be `false` because of the new thread created. 

What is worker.isMainThread in Node?

Overview

Code example 1

Code explanation

Output:

Code example 2

Code explanation

Output: