Execution wrapper around Text.JSON.Pretty to pretty-print JSON in a compact, human readable form.

Build

cabal build
cabal install

Usage

assumes ~/.local/bin on PATH

~/.cabal/bin/jpp <filename>

Example

Results from this pretty-printer

{"swagger": "2.0",
 "info": {"version": "1.0.0", "title": "Swagger Petstore",
          "description": "A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification",
          "termsOfService": "http://swagger.io/terms/",
          "contact": {"name": "Swagger API Team"},
          "license": {"name": "MIT"}},
 "host": "petstore.swagger.io", "basePath": "/api",
 "schemes": ["http"], "consumes": ["application/json"],
 "produces": ["application/json"],
 "paths": {"/pets": {"get": {"description": "Returns all pets from the system that the user has access to",
                             "produces": ["application/json"],
                             "responses": {"200": {"description": "A list of pets.",
                                                   "schema": {"type": "array",
                                                              "items": {"$ref": "#/definitions/Pet"}}}}}}},
 "definitions": {"Pet": {"type": "object",
                         "required": ["id", "name"],
                         "properties": {"id": {"type": "integer", "format": "int64"},
                                        "name": {"type": "string"}, "tag": {"type": "string"}}}}}

versus results from typical JSON pretty-printers

{
  "swagger": "2.0",
  "info": {
    "version": "1.0.0",
    "title": "Swagger Petstore",
    "description": "A sample API that uses a petstore as an example to demonstrate features in the swagger-2.0 specification",
    "termsOfService": "http://swagger.io/terms/",
    "contact": {
      "name": "Swagger API Team"
    },
    "license": {
      "name": "MIT"
    }
  },
  "host": "petstore.swagger.io",
  "basePath": "/api",
  "schemes": [
    "http"
  ],
  "consumes": [
    "application/json"
  ],
  "produces": [
    "application/json"
  ],
  "paths": {
    "/pets": {
      "get": {
        "description": "Returns all pets from the system that the user has access to",
        "produces": [
          "application/json"
        ],
        "responses": {
          "200": {
            "description": "A list of pets.",
            "schema": {
              "type": "array",
              "items": {
                "$ref": "#/definitions/Pet"
              }
            }
          }
        }
      }
    }
  },
  "definitions": {
    "Pet": {
      "type": "object",
      "required": [
        "id",
        "name"
      ],
      "properties": {
        "id": {
          "type": "integer",
          "format": "int64"
        },
        "name": {
          "type": "string"
        },
        "tag": {
          "type": "string"
        }
      }
    }
  }
}