How to get data from JSON file with batch script and write the data into a text file?

I would like to get data from a *.json file into file.txt with batch.

My JSON file config.json:

  "nodes": [
        {
          "id": "item1",
          "host": "${host:item1}",
          "apps": [
            {
              "id": "value1",
              "template_id": "value1"
            },
            {
              "id": "value2",
              "template_id": "value2",
            },

I want to get only the values value1 and value2 of id elements of node apps. But the problem on using the command find in my script is actually that it reads the values of id and template_id.

Is it possible to get the value to id and not template_id?

I tried this... still not working...

setlocal EnableDelayedExpansion
set c=0
for /f "tokens=2 delims=:, " %%a in (' find "id" ^< "config.json" ') do (
    set /a c+=1
    set val[!c!]=%%~a
)
for /L %%b in (1,1,!c!) do echo !val[%%b]!

And after that, I don't know really how to get all these data in my text file.

You shouldn't treat structured information as plain text.

If I take for example a Valid JSON (RFC 4627) version of your fragment:

{
    "nodes":[
    {
      "id":"item1",
      "host":"${host:item1}",
      "apps":[
         {
            "id":"value1",
            "template_id":"value1"
         },
         {
            "id":"value2",
            "template_id":"value2"
         }
      ]
    }]
}

And use PowerShell's cmdlet ConvertFrom-Json it's quite easy to receive the proper ID values

PoSh> $Json = Get-Content .\config.json | ConvertFrom-Json
PoSh> $JSon.Nodes.Apps.id
value1
value2

To be on topic with the batch-file tag wrapping this in a batch

@Echo off
Powershell -Nop -C "(Get-Content .\config.json|ConvertFrom-Json).Nodes.Apps.id" >file.txt