# Update Datastream Value

## Update the Datastream value

<mark style="color:blue;">`GET`</mark> `https://{server_address}/external/api/update?token={token}&{pin}={value}`

This endpoint allows you to update the value of the Datastream value via GET request.\
**Example:**\
`https://blynk.cloud/external/api/update?token=ffujYGgbf805tgsf&v1=100`

#### Path Parameters

| Name  | Type   | Description                                                                                                                                                                                                                                   |
| ----- | ------ | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| value | string | The desired value of the Datastream. Will be parsed based on the Datastream data type (int, double, string) and bounded with min / max values of datastream settings. In case value doesn't match the Datastream type error will be returned. |
| pin   | string | Virtual pin number (should start with "v")                                                                                                                                                                                                    |
| token | string | Device auth token                                                                                                                                                                                                                             |

{% tabs %}
{% tab title="200 Success" %}

```
```

{% endtab %}

{% tab title="400 " %}

```
{"error":{"message":"Invalid token."}}
or
{"error":{"message":"Wrong pin format."}}
or
{"error":{"message":"Value doesn't match the Datastream data type."}}
or
{"error":{"message":"No datastream setup for that pin."}}
```

{% endtab %}
{% endtabs %}

{% hint style="info" %}
You can get the **Device auth token** in [Device info](https://bit.ly/BlynkSimpleAuth).
{% endhint %}

## Update value by Datastream ID

<mark style="color:blue;">`GET`</mark> `https://{server_address}/external/api/update?token={token}&dataStreamId={id}&value={value}`

{% swagger-response status="400" description="Could not find a device token or Wrong dataStreamId format or Value doesn't match the Datastream data type" %}

```
{"error":{"message":"Invalid token."}}

or

{"error":{"message":"Wrong dataStreamId format."}}

or

{"error":{"message":"Value doesn't match the Datastream data type"}}
```

To update Datastreams that have 2 values, for example Location Datastream, use this call:

```
/external/api/update?token={token}&dataStreamId={id}&value=lon&value=lat
```

or

```
/external/api/update?token={token}&pin=V1&value=lon&value=lat
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.blynk.io/en/blynk.cloud/device-https-api/update-datastream-value.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.