from __future__ import annotations

import json
from typing import Any


def route_trace_json(**values: Any) -> str:
    trace: dict[str, Any] = {}
    for key, value in values.items():
        if value is None:
            continue
        if isinstance(value, str):
            value = value.strip()
            if not value:
                continue
        trace[key] = value
    return json.dumps(trace, ensure_ascii=True, sort_keys=True)