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# AWS::Lambda::Function Environment
<a name="aws-properties-lambda-function-environment"></a>

A function's environment variable settings. You can use environment variables to adjust your function's behavior without updating code. An environment variable is a pair of strings that are stored in a function's version-specific configuration.

## Syntax
<a name="aws-properties-lambda-function-environment-syntax"></a>

To declare this entity in your CloudFormation template, use the following syntax:

### JSON
<a name="aws-properties-lambda-function-environment-syntax.json"></a>

```
{
  "[Variables](#cfn-lambda-function-environment-variables)" : {Key: Value, ...}
}
```

### YAML
<a name="aws-properties-lambda-function-environment-syntax.yaml"></a>

```
  [Variables](#cfn-lambda-function-environment-variables): 
    Key: Value
```

## Properties
<a name="aws-properties-lambda-function-environment-properties"></a>

`Variables`  <a name="cfn-lambda-function-environment-variables"></a>
Environment variable key-value pairs. For more information, see [Using Lambda environment variables](https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html).  
If the value of the environment variable is a time or a duration, enclose the value in quotes.  
*Required*: No  
*Type*: Object of String  
*Pattern*: `[a-zA-Z][a-zA-Z0-9_]+`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

## Examples
<a name="aws-properties-lambda-function-environment--examples"></a>

### Environment Variables
<a name="aws-properties-lambda-function-environment--examples--Environment_Variables"></a>

Add environment variables to a function. Each variable is a key-value pair. This example specifies values for a `databaseName` and a `databaseUser`.

#### YAML
<a name="aws-properties-lambda-function-environment--examples--Environment_Variables--yaml"></a>

```
      Environment:
        Variables:
          databaseName: lambdadb
          databaseUser: admin
```