Convert results to JSON

This example uses NOAA water sample data.

Send each record to a URL endpoint using the HTTP POST method. This example uses json.encode() to convert a value into JSON bytes, then uses http.post() to send them to a URL endpoint.

The following query:

• Uses filter() to filter the average_temperature measurement.
• Uses mean() to calculate the average value from results.
• Uses map() to create a new column, jsonStr, and build a JSON object using column values from the query. It then byte-encodes the JSON object and stores it as a string in the jsonStr column.
• Uses http.post() to send the jsonStr value from each record to an HTTP endpoint.

import "http"
import "json"
from(bucket: "noaa")
    |> filter(fn: (r) => r._measurement == "average_temperature")
    |> mean()
    |> map(fn: (r) => ({r with jsonStr: string(v: json.encode(v: {"location": r.location, "mean": r._value}))}))
    |> map(
        fn: (r) => ({
            r with
            status_code: http.post(url: "http://somehost.com/",
                headers: {x: "a", y: "b"},
                data: bytes(v: r.jsonStr),
            ),
        })
    )

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