Async configuration loader/validator built on top of shortstop
Last updated 5 years ago by phated .
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Async configuration loader/validator built on top of shortstop


var joi = require('joi'); // used for validations

var config = require('outfield');

var schema = {
    description: 'The connection string for the Database',
    validate: joi.string().uri(),
    default: 'postgres://postgres@localhost:5432/testdb'

config(schema, function(err, env){
  // err if validation or resolution fails

  env.DATABASE_URL; // 'postgres://postgres@localhost:5432/testdb'


config(schema, [options], callback)

The only method. Takes a schema object, optional options, and a callback. The schema is parsed, resolved, populated and validated and the callback is called with an error or an object containing the environment. Everything is resolved using the process.env with fallbacks to resolving the resolve property using shortstop and then the default property.


The schema object is composed of keys for your environment. Each key is assigned a definition object comprised of 4 keywords. Instead of a definiton object, you can nest keys; However, if there are any keywords, the nesting will be ignored.

  • description (optional) - Used to describe your configuration. Not currently used internally, but allows for extra features in the future.
  • validate (required) - Used to validate and convert values to proper types. Accepts joi validations.
  • default (optional) - Used to provide a default to your environment if the key can't be resolved or isn't in process.env.
  • resolve (optional) - String that resolves to a registered shortstop handler. Note: No shortstop handlers are registered by default. They must be added using the options object.


The options object allows you to register shortstop handlers and adjust joi configuration.

  • handlers (optional) - Object containing key/handler pairs of shortstop handlers to register in the shortstop instance. The handler can be an array of handlers, each will be registered as the key.
  • joi (optional) - Object containing joi configuration overrides. Note: In this module, allowUnknown is defaulted to true, abortEarly is defaulted to false and presence is defaulted to required instead of the joi defaults.

callback(err, env)

The callback function is called once all resolution and validation is done. If resolution or validation fails, the callback will be called with an error. If everything succeeds, the env argument will be an object containing the fully resolved environment. Also, the property NODE_ENV will be resolved to development if undefined in the environment and the properties development, production, test and staging will be resolved to booleans based on NODE_ENV. Note: environment variables will not be resolved if allowUnknown is false in the joi configuration.



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