@learningalbum/env-validation v1.0.9

ENV validation library

This library is designed to support validating environment variables for a nodejs application of any kind.

How to use

In a file (e.g. config.js)

require('dotenv').config();

const {validate, validations, preProcessors} = require('@learningalbum/env-validation');

const {castBool} = preProcessors;
const {mustBeOneOf, requiredIfPresent, requiredIfTrue} = validations;

const varsConfig = [
  // Array of variable configs (see below)
  {
    name: 'MY_VAR',
    require: true,
  }
]

// Get the validated vars into an object like {VAR1, VAR2, VAR3, etc} 
module.exports = validate(varsConfig);

Then in your application code, wherever you need config from your env, you do stuff like:

const { MY_VAR } = require('config.js');
// Do something with MY_VAR

If MY_VAR doesn't validate in the way you've configured in config.js, the app won't even start and there will be an error message describing why.

Variable configs

Declare each variable you want to validate. For full details on the interface, please see src/types.ts.