Django Admin - Pretty Print (formatted / idented / no color) JSON (read-only)

admin.py

# IMPORTANT: Just keep in mind this is not ideal for untrusted JSON content.
import json

from django.contrib import admin

from .models import Publication


@admin.register(Publication)
class PublicationAdmin(admin.ModelAdmin):
    readonly_fields = (
        "pretty_meta_info",
    )

    @admin.display(description="Meta Info")
    def pretty_meta_info(self, publication):
        pretty_json = json.dumps(publication.meta_info, indent=4, sort_keys=True)
        return mark_safe(f"<pre>{pretty_json}</pre>")