diff --git a/data_logging/src/data_logging/cli.py b/data_logging/src/data_logging/cli.py
new file mode 100644
index 0000000..8855eef
--- /dev/null
+++ b/data_logging/src/data_logging/cli.py
@@ -0,0 +1,67 @@
+import argparse
+import json
+import sys
+from datetime import datetime
+from pathlib import Path
+from typing import Any, Dict
+
+from data_logging import core
+
+
+def _validate_log_entry(entry: Dict[str, Any]) -> bool:
+    """Validate a single log entry structure."""
+    required_fields = {"timestamp": str, "frequency": (float, int), "signal_strength": (float, int)}
+    for field, expected_type in required_fields.items():
+        if field not in entry:
+            return False
+        if not isinstance(entry[field], expected_type):
+            return False
+    # Further timestamp validation
+    try:
+        datetime.fromisoformat(entry["timestamp"])
+    except ValueError:
+        return False
+    return True
+
+
+def _load_stdin_data() -> list[Dict[str, Any]]:
+    """Loads JSON data from standard input and validates entries."""
+    try:
+        data = json.load(sys.stdin)
+    except json.JSONDecodeError as exc:
+        raise SystemExit(f"Invalid JSON input: {exc}")
+
+    if not isinstance(data, list):
+        raise SystemExit("Input JSON must be a list of measurement entries.")
+
+    for idx, entry in enumerate(data):
+        if not _validate_log_entry(entry):
+            raise SystemExit(f"Invalid entry at index {idx}: {entry}")
+    return data
+
+
+def main() -> None:
+    """CLI entrypoint for WLAN data logging."""
+    parser = argparse.ArgumentParser(description="WLAN Signal Logging CLI")
+    parser.add_argument(
+        "--output",
+        required=True,
+        help="Pfad der JSON-Datei, in die die Messungen geschrieben werden",
+    )
+    args = parser.parse_args()
+
+    output_path = Path(args.output)
+    output_path.parent.mkdir(parents=True, exist_ok=True)
+
+    measurements = _load_stdin_data()
+
+    for entry in measurements:
+        core.log_wifi_data(
+            timestamp=entry["timestamp"],
+            frequency=float(entry["frequency"]),
+            signal_strength=float(entry["signal_strength"]),
+        )
+
+
+if __name__ == "__main__":
+    main()
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