> For the complete documentation index, see [llms.txt](https://docs.bunzz.dev/product-docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.bunzz.dev/product-docs/others/uri-argument-base-token-uri.md).

# URI Argument / Base Token URI

In general, NFT/MultiToken module templates constructors take several arguments and one of them is called **URI.**\
**URI stands for Universal Resource Identifier.**\
The role of this argument is to provide the base for your endpoint [metadata](https://eips.ethereum.org/EIPS/eip-1155#metadata).\
[Metadata](https://eips.ethereum.org/EIPS/eip-1155#metadata) represents the information of your NFT/MultiToken, this information holds data like name, current owner, previous owner, etc..., but one of the most important attributes is the picture/image of the NFT/MultiToken. Based on the meaning of the Universal Resource Identifier, this resource ([metadata](https://eips.ethereum.org/EIPS/eip-1155#metadata)) is unique per every token based on its token id.\
\
 URI Example: \
&#x20;`https://my-metadata-server/api/`<br>

The example from above represents an example of the value that the URI argument should take.\
Based on that example, if we want to retrieve [metadata](https://eips.ethereum.org/EIPS/eip-1155#metadata) associated with token id 1 the endpoint will look like this:&#x20;

&#x20;`https://my-metadata-server/api/1`

Based on the current EIPs for metadata this endpoint should return a JSON-object, following you can see the example below for a compatible JSON schema.<br>

```
{
    "title": "Token Metadata",
    "type": "object",
    "properties": {
        "name": {
            "type": "string",
            "description": "Identifies the asset to which this token represents"
        },
        "decimals": {
            "type": "integer",
            "description": "The number of decimal places that the token amount should display - e.g. 18, means to divide the token amount by 1000000000000000000 to get its user representation."
        },
        "description": {
            "type": "string",
            "description": "Describes the asset to which this token represents"
        },
        "image": {
            "type": "string",
            "description": "A URI pointing to a resource with mime-type image/* representing the asset to which this token represents. Consider making any images at a width between 320 and 1080 pixels and aspect ratio between 1.91:1 and 4:5 inclusive."
        }
    }
}
```

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