`nextflow inspect|config -o json` doesn't return valid json

[mashehu]

Bug report

Expected behavior and actual behavior

I would like to directly run the output of these commands through a json parser.
Unfortunately, the output is not pure JSON, e.g.

nextflow inspect . -o json
Monitor the execution with Seqera Platform using this URL: https://cloud.seqera.io/user/***
{    
    "processes": [
....

or

nextflow config -o json 
WARN: Unrecognized config option 'validation.defaultIgnoreParams'
WARN: Unrecognized config option 'validation.monochromeLogs'
{
    "params": {

Steps to reproduce the problem

Create a minimal nextflow config e.g

params {
    input = null
}
plugins {
    id 'nf-schema@2.5.1' // Validation of pipeline parameters and creation of an input channel from a sample sheet
}
validation {
    defaultIgnoreParams = ["genomes"]
    monochromeLogs = params.monochrome_logs
}

and run nextflow config -o json on it.

Program output

WARN: Unrecognized config option 'validation.defaultIgnoreParams'
WARN: Unrecognized config option 'validation.monochromeLogs'
{
    "params": {
        "input": null
    },
    "plugins": [
        "nf-schema@2.5.1"
    ],
    "validation": {
        "defaultIgnoreParams": [
            "genomes"
        ],
        "monochromeLogs": null
    }
}

Environment

Version: 26.04.0 build 12031
System: Mac OS X 26.4.1
Runtime: Groovy 4.0.31 on OpenJDK 64-Bit Server VM 21.0.2+13-58

Additional context

I guess the source for both is different, but the general assumption I had is that i get pure json output in stdout when running -o json.