> For the complete documentation index, see [llms.txt](https://zefi.gitbook.io/circomjs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://zefi.gitbook.io/circomjs/circuit-config-file/filename.md).

# fileName

### fileName

The [circuit config file](/circomjs/circuit-config-file/circuit-config-file.md) has a field `fileName` for every circuit declared inside `circuits`.

This value of this field is used to resolve the file path of your circuit and helps CircomJS from it.

The resolved file path is `inputDIR`/`fileName`. The below diagram illustrates this.

<figure><img src="https://2197554927-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9Aip7tCnENWgfV4SAnlA%2Fuploads%2FxpI4WxLWQQogPJI60APW%2Fimage.png?alt=media&amp;token=093b52f9-a247-4d10-b864-b5ff6bd514e2" alt=""><figcaption><p>filepath resolution of circuit</p></figcaption></figure>

In the above scenario, the `fileName` is "multiply.circom", hence the file path where CircomJS will look for this circuit, will be at `inputDIR`/`fileName`, i.e `./circuits/multiply.circom`.

#### What about nested file paths?

What if your circuit is inside a `multiply` directory? Then you should assign the following value to `fileName`->`multiply/multiply.circom`, this way CircomJS will look inside `inputDir`/`multiply` directory for a Circom file with the name `multiply.circom`.

<figure><img src="https://2197554927-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F9Aip7tCnENWgfV4SAnlA%2Fuploads%2FtQe1UI0yYp5WaVq5Jlt7%2Fimage.png?alt=media&amp;token=33f78503-a9f1-4b8d-97bb-9bd6127e89f9" alt=""><figcaption><p>filepath resolution for circuits with nested structure.</p></figcaption></figure>

{% hint style="info" %}
The above-described method of file resolution only applies for **`fileName`** field, all other file paths are resolved relative to the current working directory.<br>

For example in the above diagram, **powerOfTauFp** **will be resolved relative to the current working directory, and not relative to`inputDir`.**
{% endhint %}