# CUSTOM JS – Where to insert a custom code?

**Custom JS** is the most customizable block. By default, it has one input port, but it can have as many output ports as you need.

![CUSTOM JS](/files/-Ma2WzjWADWA4jUc_HGC)

### :point\_right: **BASIC FUNCTIONALITIES**

**JS -** This is where the JavaScript code can be placed. In this field, you can insert any code you need to make your voicebot behaving according to your business requirements.

**Number of outputs –** Here you specify the number of output ports you want this particular block to consist of. This allows you to create multiple branches of the Conversational Flow Scenario.

{% hint style="warning" %}
**REMEMBER!**  *When creating a code in the JS field write `return out1()`, `out2()` etc. for each output port of the Custom JS Block.* 

*If you want to pass an argument to the next block your output port function should return it.*
{% endhint %}

{% hint style="success" %}
**TIP:** *Typically, the return functions should be placed at the end of the code. The only exception is when you need to break the code execution.*
{% endhint %}


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