# Request, Response, Pagination, and Error formats

Supply'd's API exchanges data in JSON format, where:

1. all requests should include an `Accept: application/json` header
2. all responses will include a `Content-Type: application/json` header

POST/PUT requests expect JSON in the HTTP message body, and you must specify the `Content-Type` header in your request.

## Pagination

If an API call requires pagination the response will include a link header for the next page of results:

`Link: </v1/path/to/resource?page=X>; rel=next`

The final page of results will not have a link header.

## Errors

Depending on your request's `Accept` header, the error will be returned as plain-text or JSON.

Plain-text errors are just the message as a string.

JSON errors return the message, and may include  the following format:

```
{
    "error": "<message>",
    "data": null|object
}
```


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