Nimble Options Save

A tiny library for validating and documenting high-level options. 💽

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A tiny library for validating and documenting high-level options.

This library allows you to validate options based on a definition. A definition is a keyword list specifying how the options you want to validate should look like:

definition = [
  connections: [
    type: :non_neg_integer,
    default: 5
  url: [
    type: :string,
    required: true

Now you can validate options through NimbleOptions.validate/2:

options = [url: ""]

NimbleOptions.validate(options, definition)
#=> {:ok, [url: "", connections: 5]}

If the options don't match the definition, an error is returned:

NimbleOptions.validate([connections: 3], definition)
   keys_path: [],
   message: "required option :url not found, received options: [:connections]"

NimbleOptions is also capable of automatically generating documentation for a definition by calling with your definition.


You can install nimble_options by adding it to your list of dependencies in mix.exs:

def deps do
    {:nimble_options, "~> 1.0"}


All nimble libraries by Dashbit:

  • NimbleCSV - simple and fast CSV parsing
  • NimbleOptions - tiny library for validating and documenting high-level options
  • NimbleParsec - simple and fast parser combinators
  • NimblePool - tiny resource-pool implementation
  • NimblePublisher - a minimal filesystem-based publishing engine with Markdown support and code highlighting
  • NimbleTOTP - tiny library for generating time-based one time passwords (TOTP)


Copyright 2020 Dashbit

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Open Source Agenda is not affiliated with "Nimble Options" Project. README Source: dashbitco/nimble_options
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