how to shown message erreur on popup

Each technician have just one 'Tarification' for a specific 'tache' i made a condition if the 'tarification' exists it return an error message but in another page I would display it in the same on a popup

public function store(Request $request)
{
$count = tarificationtache::where('technicien_id', $request- 
>input('technicien_id'))
    ->where('tache_id', $request->input('tache_id'))
    ->count();
if ($count > 0) {
    // TODO: adjust response according to your need

    return response()->json(['error' => "Ce technicien a cette 
tarification"], 400);
} else {
    $tarification = new tarificationtache;    
    $tarification->tache_id = $request->input('tache_id');
    $tarification->Tarif = $request->input('Tarif');
    $tarification->technicien_id = $request->input('technicien_id');
    $tarification->save();
    // TODO: adjust response according to your need
     return redirect('technicien');
}
}

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