> ## Documentation Index
> Fetch the complete documentation index at: https://docs.squarecloud.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Overwrite Variables

> Overwrite environment variables with the new values.

<ParamField header="Authorization" type="string" placeholder="API Key" required>
  The API key for your account. You can find this in your [account settings](https://squarecloud.app/en/account/security).
</ParamField>

Overwrite replaces the application's entire environment with exactly the variables you send: anything already set that isn't included in the request body is deleted. Sending an empty `envs` object wipes every variable, which makes this the endpoint to use for a full reset rather than an incremental change.

The same limits as other environment variable endpoints apply: up to 256 variables per application, 1024 characters per key, 4096 per value. Static applications aren't supported and return an error, and on workspace-shared applications the caller needs the Administrator role or ownership.

If you only need to change a few variables without touching the rest, use [Add/Edit Variables](/en/api-reference/endpoint/apps/envs/add_n_edit) instead, or [Remove Variables](/en/api-reference/endpoint/apps/envs/remove) to delete specific keys.

### Parameters

<ParamField path="app_id" type="string" placeholder="App ID" required>
  The application ID.
</ParamField>

<ParamField body="envs" type="object">
  The key and value variables you want on the environment.
</ParamField>

### Response

<ResponseField name="status" type="string">
  Indicates whether the call was successful.. `success` if successful, `error` if not.
</ResponseField>

<ResponseField name="response" type="object">
  The key and value of all environment variables you defined.
</ResponseField>

<ResponseExample>
  ```json theme={null}
  {
    "status": "success",
    "response": {
      "TEST": "overwriteTest"
    }
  }
  ```
</ResponseExample>

### Common errors

| Code                           | HTTP | Meaning                                                                     |
| ------------------------------ | ---- | --------------------------------------------------------------------------- |
| `STATIC_APP_ENV_NOT_SUPPORTED` | 400  | The application is static; static apps don't support environment variables. |
| `INVALID_ENV_CONTENT`          | 400  | `envs` is missing, not an object, or an array.                              |
| `TOO_MANY_ENV_VARS`            | 400  | The new set would exceed 256 environment variables.                         |
| `ENV_NAME_TOO_LONG`            | 400  | A variable key exceeds 1024 characters.                                     |
| `ENV_CONTENT_TOO_LONG`         | 400  | A variable value exceeds 4096 characters.                                   |