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[@salesforce/b2c-tooling-sdk](../../../modules.md) / [operations/mrt](../index.md) / setEnvVar

# Function: setEnvVar()

> **setEnvVar**(`options`, `auth`): `Promise`\<`void`\>

Defined in: [packages/b2c-tooling-sdk/src/operations/mrt/env-var.ts:197](https://github.com/SalesforceCommerceCloud/b2c-developer-tooling/blob/e7c16f1ae423da0aa47b3e10be88f9770b53619b/packages/b2c-tooling-sdk/src/operations/mrt/env-var.ts#L197)

Sets an environment variable on a project environment.

Creates the variable if it doesn't exist, or updates it if it does.

## Parameters

### options

[`SetEnvVarOptions`](../interfaces/SetEnvVarOptions.md)

Options specifying project, environment, and variable

### auth

[`AuthStrategy`](../../../auth/interfaces/AuthStrategy.md)

Authentication strategy (ApiKeyStrategy)

## Returns

`Promise`\<`void`\>

## Throws

Error if request fails

## Example

```typescript
import { ApiKeyStrategy } from '@salesforce/b2c-tooling-sdk/auth';
import { setEnvVar } from '@salesforce/b2c-tooling-sdk/operations/mrt';

const auth = new ApiKeyStrategy(process.env.MRT_API_KEY!, 'Authorization');

await setEnvVar({
  projectSlug: 'my-storefront',
  environment: 'production',
  key: 'API_KEY',
  value: 'secret-value'
}, auth);
```