# `400` - Invalid request

## Description

The request contains some data that is not in the format we expect.

## How to fix

- Check the `details` value in the response to get additional information.
- Check the expected format for the API call request in the [API Reference](/api).
- Check the implementation on your side and make sure that the format of the request matches the expected format for the API endpoint.


## Example

```http
HTTP/1.1 400 Bad Request
content-length: 228
content-type: application/problem+json
date: Mon, 11 Oct 2021 10:42:01 GMT
upvest-request-id: e7378103-7d45-4052-a049-7c9ac88d041c

{
    "type": "https://docs.upvest.co/errors/invalid_request",
    "status": 400,
    "title": "Invalid request",
    "request_id": "e7378103-7d45-4052-a049-7c9ac88d041c",
    "details": "(root): field 'first_name' was not filled"
}
```