Using reduce() to construct a JSON.

Send data in JSON body with

Use the reduce() function to create a JSON object to include as the body with

  1. Import both the array package to query data and contruct table(s), and the http package to transfer JSON over http.

  2. Use array.from() to query data and construct a table. Or, use another method to query data with Flux.

  3. Use the reduce() function to construct a JSON object, and then use yield() to store the output of reduce. This table looks like:

  4. Use the map() function to combine the two components together into a JSON object, and then use a second yield() function to store this object as final JSON. This table looks like:

    example-field:[“3"4"1{example-tag-key:[“bar"bar"bar{example-tag-key:[“bar"bar"bar] , example-field:[“3"4"1]}
  5. Use the findRecord() function to extract the value from the final column, the JSON.

  6. Use to specify a URL to sent the JSON to. In this example, we use Post Test Server as URL to send the JSON to, and test the function.

import "array"
import "http"

data = array.from(
        rows: [
            {_time: 2020-01-01T00:00:00Z, _field: "example-field", _value: 3, foo: "bar"},
            {_time: 2020-01-01T00:01:00Z, _field: "example-field", _value: 4, foo: "bar"},
            {_time: 2020-01-01T00:02:00Z, _field: "example-field", _value: 1, foo: "bar"},
    |> reduce(
            fn: (r, accumulator) => ({tag:accumulator.tag + "\"" +, 
                                    field : accumulator.field + "\"" + string(v:r._value)
            identity: {tag: "{example-tag-key:[", 
                    field: "example-field:[" }
    |> yield(name: "output of reduce")
    |> map(fn: (r) => ({ r with tag: r.tag + "]" }))
    |> map(fn: (r) => ({ r with field: r.field + "]}" }))
    |> map(fn: (r) => ({ r with final: r.tag + " , " + r.field}))
    |> yield(name: "final JSON")
    |> findRecord(
        fn: (key) => true,
        idx: 0,
    url: "",
    headers: {"Content-type": "application/json"},
    data: bytes(v:,

Was this page helpful?

Thank you for your feedback!

Linux Package Signing Key Rotation

All signed InfluxData Linux packages have been resigned with an updated key. If using Linux, you may need to update your package configuration to continue to download and verify InfluxData software packages.

For more information, see the Linux Package Signing Key Rotation blog post.

State of the InfluxDB Cloud (IOx) documentation

The new documentation for InfluxDB Cloud backed by InfluxDB IOx is a work in progress. We are adding new information and content almost daily. Thank you for your patience!

If there is specific information you’re looking for, please submit a documentation issue.