# Set Data

### Endpoint

```
POST /api/v1/data/set
```

***

### Request Body

| Field    | Type   | Required   | Description                 |
| -------- | ------ | ---------- | --------------------------- |
| `userId` | string | <h3>✓</h3> | The player's Roblox user ID |
| `key`    | string | <h3>✓</h3> | The key to set              |
| `value`  | any    | <h3>✓</h3> | The value to store          |

***

### Example Request

```lua
Auxvyn.set(player.UserId, "coins", 500)
```

***

### Example Response

```json
{
  "success": true
}
```

***

### Value Types

You can store any of the following value types:

| Type    | Example               |
| ------- | --------------------- |
| Number  | `500`                 |
| String  | `"warrior"`           |
| Boolean | `true`                |
| Table   | `{"sword", "shield"}` |

{% hint style="warning" %}
Roblox-specific types like `Vector3`, `CFrame`, or `Color3` cannot be stored directly. Convert them to a table or string first.
{% endhint %}

***

### Overwriting Values

Calling `Auxvyn.set()` on a key that already exists overwrites the previous value completely. There is no merge behavior, if you want to update part of a table you need to read it first, modify it, then write it back.

```lua
-- Read existing inventory
local inventory = Auxvyn.get(player.UserId, "inventory") or {}

-- Add an item
table.insert(inventory, "sword")

-- Write it back
Auxvyn.set(player.UserId, "inventory", inventory)
```

***

### Error Responses

| Code  | Reason                              |
| ----- | ----------------------------------- |
| `400` | Missing `userId`, `key`, or `value` |
| `401` | Missing or invalid API key          |
| `500` | Failed to save — try again          |

***

### What's Next


---

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