Friend Zone / Proximity

Server zone detection loop pushes enter/exit events reliably. Client fetches nearby players on demand.

copylocal zones = { spawn = { center=Vector3.new(0,0,0), radius=30 } }
local playerZone = {}

app:Get("zone/:name/players", function(Player, Payload, req, res)
    if not zones[req.params.name] then res:Status(404):Error("Unknown zone"); return end
    local inside = {}
    for uid, z in pairs(playerZone) do
        if z == req.params.name then table.insert(inside, game.Players:GetPlayerByUserId(uid).Name) end
    end
    res:Send({ players = inside })
end)

task.spawn(function()
    while true do
        task.wait(2)
        for _, player in ipairs(game.Players:GetPlayers()) do
            local char = player.Character; if not char then continue end
            local pos  = char:GetPivot().Position
            local prev = playerZone[player.UserId]; local curr = nil
            for name, zone in pairs(zones) do
                if (pos - zone.center).Magnitude <= zone.radius then curr = name; break end
            end
            if curr ~= prev then
                playerZone[player.UserId] = curr
                if     curr then app:Push(player, "zone.enter", { zone=curr })
                elseif prev then app:Push(player, "zone.exit",  { zone=prev }) end
            end
        end
    end
end)

See also

App | push per player  ·  Server Push  ·  Router | named string param  ·  Listener | client-side zone events