> For the complete documentation index, see [llms.txt](https://docs.pulsoid.net/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pulsoid.net/read-heart-rate/read-latest-heart-rate-via-http.md).

# Read Latest Heart Rate via HTTP

This method allows reading the latest heart rate of the user. Note that most heart rate monitors can measure changes in heart rate once per second, so it is reasonable to query this endpoint once per 500 ms to receive real-time heart rate data.

**Request:**

<table><thead><tr><th width="131">name</th><th>value</th></tr></thead><tbody><tr><td>url</td><td><code>https://dev.pulsoid.net/api/v1/data/heart_rate/latest</code></td></tr><tr><td>method</td><td><code>GET</code></td></tr><tr><td>scope</td><td><code>data:heart_rate:read</code></td></tr></tbody></table>

**Query Parameters explained:**

<table><thead><tr><th width="165">name</th><th>type</th><th width="176">possible values</th><th width="83">default</th><th>description</th></tr></thead><tbody><tr><td>response_mode</td><td>string</td><td><code>json</code>, <code>text_plain_only_heart_rate</code></td><td><code>json</code></td><td>Allow control format of response</td></tr></tbody></table>

**Headers Parameters explained:**

<table><thead><tr><th width="168">name</th><th>value</th><th>description</th></tr></thead><tbody><tr><td>Authorization</td><td>Bearer {access token}</td><td>How to obtains access token<br><a href="https://docs.pulsoid.net/#how-to-obtain-an-authorization-token">https://docs.pulsoid.net/#how-to-obtain-an-authorization-token</a></td></tr></tbody></table>

**Response:**

| name             | type   | description                       |
| ---------------- | ------ | --------------------------------- |
| measured\_at     | number | Unix timestamp in milliseconds    |
| data             | object | Holds metrics data                |
| data.heart\_rate | number | User's latest received heart rate |

**Specific Errors:**

| http status code | reason                                |
| ---------------- | ------------------------------------- |
| 412              | User doesn't have any heart rate data |

**cURL Request Example:**

```bash
curl --request GET \
  --url https://dev.pulsoid.net/api/v1/data/heart_rate/latest \
  --header 'Authorization: Bearer 8c4da3ce-7ed7-4a19-a1f1-058498661e45' \
  --header 'Content-Type: application/json' 
```

**Response Example**

```json
{
  "measured_at": 1625310655000,
  "data": {
    "heart_rate": 40
  }
}
```

**cURL Request Example with response\_mode=text\_plain\_only\_heart\_rate**

```bash
curl --request GET \
  --url 'https://dev.pulsoid.net/api/v1/data/heart_rate/latest?response_mode=text_plain_only_heart_rate' \
  --header 'Authorization: Bearer a433b947-b2ff-4eea-8751-b0542b76897e'
```

**Response Example with response\_mode=text\_plain\_only\_heart\_rate**

```json
129
```

includes header `content-type: text/plain; charset=UTF-8`