Envoose

Simplistic env var parser inspired by mongoose schema

Install

# Using npm
$ npm install envoose

# Or using yarn
$ yarn add envoose

Example

// config.js
const envoose = require('envoose')

const configSchema = {
  MONGO_URI: { required: true },
  REQUEST_TIMEOUT: { type: Number, default: 1000 },
  EXPIRY_DATE: { type: Date },
  BOOLEAN_VAL: { type: Boolean },
  CUSTOM_VAR: { env: 'CUSTOM_ENV_VAR' },
  LIST: { type: s => s.split(',').map(Number) },
  ENUM_VALID: { type: String, enum: ['A', 'B', 'C'] },
  MATCH_VALID: { type: String, match: /.*match.*/g },
  CUSTOM_VALID: { type: Number, validator: x => x !== 10 }
  // INVALID_MIX: { required: true, default: 10 }
}

const config = envoose.getConfig(configSchema)

module.exports = config

Docs

envoose.getConfig(configSchema)

Validate and load configs object using configSchema

ConfigSchema

A configSchema is an object that tells envoose which env vars to load and how to load them, in its most basic form, it's just a set of keys to load

const configSchema = {
  FIRST_KEY: {},
  SECOND_KEY: {}
}

Options

required

A required key must be supplied through env vars. If the value is not available in process.env, getConfig will throw ConfigValidationError.

Note that default and required can't be combined.

default

A value to fallback to if the env var is not set.

env

By default the config is read from env var with the same name as the config name. If env is supplied, it will read from that env var instead.

type

Env vars are strings by default, however envoose allows you to cast them to different data types.

Supported Types

• String (default)
• Number
• Date
• Boolean ('true', 'yes', '1' evaluate to true, while 'false', 'no', '0' evaluate to false, CastError will be thrown otherwise)
• Custom types by supplying a mapping function (ex: array of numbers s => s.split(',').map(Number))

enum

Built in validator that checks whether the value falls in one of the values in the list. Throws ConfigValidationError if not found in enum.

match

Built in validator that checks whether the value matches this regex or not. Throws ConfigValidationError if not matched.

validator

Accepts custom validation function that should return true if valid and false otherwise.