# JS SDK Configuration

{% hint style="warning" %}
Integrators and partners are expected to use the Symbiosis API for production integrations.
{% endhint %}

The entry point of Symbiosis JS SDK is to create an instance of the 'Symbiosis' class that takes a config preset 'mainnet' or an object of [`Config type`](/developer-tools/symbiosis-js-sdk/js-sdk-types.md#config-type) as a parameter. 

```
const symbiosis = new Symbiosis('mainnet' | config, clientId) 
```

* [Mainnet configuration](https://github.com/symbiosis-finance/js-sdk/blob/main/src/crosschain/config/mainnet.ts)

**Note on Testnet:** While a Testnet environment exists for testing purposes, functionality verified on Testnet does not guarantee the same behavior on Mainnet. We strongly recommend testing directly on Mainnet using low-cost networks and small token amounts.


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