getEnv

The getEnv function returns the value of an environment variable, with support for a fallback if it does not exist.

Syntax

getEnv(key: string, fallback?: string): string | undefined;

Parameters

Name	Type	Description
key	string	The name of the environment variable to retrieve
fallback	string	Alternative value if the variable does not exist (optional)

Returns

Type	Description
string | undefined	The value of the environment variable, or the fallback, or undefined if neither exists

Examples

getEnv("NODE_ENV");
// => "production", "development", etc.

getEnv("NON_EXISTENT", "defaultValue");
// => "defaultValue"

Notes

• Supports Node.js and Deno environments.
• Returns the fallback value if the variable does not exist.

References

• https://nodejs.org/api/process.html#processenv