Json_v2 how to have all elements in "tags" object added as tags?


I need to parse the following message, which is the json format generated by output.mqtt plugin when using “json” as format.


      "fields": {
        "temperature": 15.47
      "name": "temperature",
      "tags": {
        "area": "INT",
        "device": "input",
        "equipment": "EQP1",
        "site": "DEV_INTEGRATION",
        "source": "zigbee",
        "topic": "zigbee2mqtt/EQP1/temperature/input"
      "timestamp": 1683297978470

Right now I’m using json_v2 to parse it with the code below

      measurement_name_path = "name" 
      timestamp_path = "timestamp"
      timestamp_format = "unix_ms"
          path = "@this"
          tags = ["tags_area", "tags_host", "tags_site", "tags_source", "tags_topic", "tags_equipment", "tags_device", "name"]
          disable_prepend_keys = true
          excluded_keys = ["timestamp"]

I’ve got 2 questions

  1. Is there already a json or json_v2 to parse this template ?
  2. If not, using json_v2, I want the the json parse to use treat all keys contained in “tags” as a tag, and not only the list I’ve predefined. Is it possible to do so ?

The query syntax supports gjson.
Here’s an example of handling specific values:

But also defining tags is optional by default theyll be fields

  • tags (OPTIONAL): You can define json keys to be set as tags instead of fields, if you define a key that is an array or object then all nested values will become a tag.

For example:
Example JSON:

    "book": {
        "title": "The Lord Of The Rings",
        "chapters": [
            "A Long-expected Party",
            "The Shadow of the Past"
        "author": "Tolkien",
        "characters": [
                "name": "Bilbo",
                "species": "hobbit"
                "name": "Frodo",
                "species": "hobbit"
        "random": [

Example configuration:

    files = ["./testdata/multiple_arrays_in_object/input.json"]
    data_format = "json_v2"
            path = "book"
            tags = ["title"]
            disable_prepend_keys = true

Expected line protocol:

file,title=The\ Lord\ Of\ The\ Rings author="Tolkien",chapters="A Long-expected Party"
file,title=The\ Lord\ Of\ The\ Rings author="Tolkien",chapters="The Shadow of the Past"
file,title=The\ Lord\ Of\ The\ Rings author="Tolkien",name="Bilbo",species="hobbit"
file,title=The\ Lord\ Of\ The\ Rings author="Tolkien",name="Frodo",species="hobbit"
file,title=The\ Lord\ Of\ The\ Rings author="Tolkien",random=1
file,title=The\ Lord\ Of\ The\ Rings author="Tolkien",random=2

So if you were to make characters a tag it would list out the characters as you expect with the field structure here but just as a tag instead.

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Here are a collection of examples that can be helpful too:

@cyril.jean for completeness, here the way to parse the input using the xpath parser

  data_format = "xpath_json"

  xpath_native_types = true

    metric_name = "/name"
    timestamp = "/timestamp"
    timestamp_format = "unix_ms"
    field_selection = "/fields/*"
    tag_selection = "/tags/*"

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