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middy-env

v2.0.0

Published

Environment variable middleware for the middy framework

Downloads

8,289

Readme

Middy Env

Environment variable middleware for the middy framework

npm version

Install

npm install middy-env

The specified environment variables will be parsed and passed into the handler.

Options

  • cache (boolean) (optional): Set it to true to skip further lookups of environment variables. Defaults to false.
  • cacheExpiryInMillis (int) (optional): Time in milliseconds for values to remain cached. Defaults to undefined.
  • setToContext (boolean) (optional): This will assign the parsed values to the context object of the function handler rather than to process.env. Defaults to true.
  • names (object) (required): Map of environment variables to parse, where the key is the destination.
    Either provide just the environment variable key. Or provide the key, type and fallback value e.g. ['KEY', 'string', 'fallbackValue'].

By default parameters are assigned to the function handler's context object. They can instead be assigned to the Node.js process.env object by setting the setToContext flag to false.
If no fallback value is provided a ReferenceError will be thrown if an environment variable is undefined.

Supported Types

  • string
  • int
  • float
  • bool

Usage

const middy = require('middy');
const env = require('middy-env');

const handler = (event, context, callback) => {
  callback(null, `Hello ${context.firstName} ${context.lastName}`);
};

module.exports = middy(handler)
  .use(env({ 
    names: {
      firstName: ['FIRST_NAME', 'string', 'World'],
      lastName: 'LAST_NAME'
    },
    cache: true,
    cacheExpiryInMillis: 3600000
  }));