Monthly Downloads: 938
Programming language: Elixir
License: MIT License
Tags: REST And API    
Latest version: v1.0.0

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This package can be installed by adding accent to your list of dependencies in mix.exs:

def deps do
  [{:accent, "~> 1.0"}]

Please note that you will need to provide accent with a JSON codec. Both poison and jason are supported.


This project provides two plugs for handling the conversion of JSON keys to different cases: Accent.Plug.Request and Accent.Plug.Response


Transforms the keys of an HTTP request's params to the same or a different case.

You can specify what case to convert keys to by passing in a :transformer option.

Accent supports the following transformers out of the box:

  • Accent.Case.Camel (e.g. camelCase)
  • Accent.Case.Pascal (e.g. PascalCase)
  • Accent.Case.Snake (e.g. snake_case)

If no transformer is provided then Accent.Case.Snake will be used.

Please note that this plug will need to be executed after the request has been parsed.


Given this request:

curl -X POST https://yourapi.com/endpoints \
  -H "Content-Type: application/json" \
  -d '{"hello": "Accent"}'

a router with this configuration:

plug Plug.Parsers, parsers: [:urlencoded, :multipart, :json],
                   pass: ["*/*"],
                   json_decoder: Jason

plug Accent.Plug.Request

could expect to receive a conn.params value of:

%{"hello" => "Accent"}


Transforms the keys of an HTTP response to the case requested by the client.

A client can request what case the keys are formatted in by passing the case as a header in the request. By default the header key is Accent. If the client does not request a case or requests an unsupported case then a default case defined by :default_case will be used. If no default case is provided then no conversion will happen. By default the supported cases are camel, pascal and snake.


  • :default_case - module used to case the response when the client does not request a case or requests an unsupported case. When not provided then no conversation will happen for the above scenarios. Defaults to nil.
  • :header - the HTTP header used to determine the case to convert the response body to before sending the response (default: Accent)
  • :json_codec - module used to encode and decode JSON. The module is expected to define decode/1 and encode!/1 functions (required).
  • :supported_cases - map that defines what cases a client can request. By default camel, pascal and snake are supported.


plug Accent.Plug.Response, default_case: Accent.Case.Snake,
                           header: "x-accent",
                           supported_cases: %{"pascal" => Accent.Case.Pascal},
                           json_codec: Jason

Given this request:

curl -X POST https://yourapi.com/endpoints \
  -H "Content-Type: application/json" \
  -H "Accent: camel" \
  -d '{"hello": "Accent"}'

with this router:

defmodule MyAPI.Router do
  use Plug.Router

  plug Accent.Plug.Response, json_codec: Jason

  post "/" do
    send_resp(conn, 200, Jason.encode!(%{hello_back: "Anthony"}))

a client could expect a JSON response of:

  "helloBack": "Anthony"


A special thanks to all of our contributors!