normalizr ·

Simple package for json normalization just like normalizr.

About

Many APIs, public or not, return JSON data that has deeply nested objects. Using data in this kind of structure is often very difficult.

Normalizr is a small, but powerful utility for taking JSON with a schema definition and returning nested entities with their IDs, gathered in dictionaries.

Links

Pub dev

Documentation

Issue tracker

Usage

Example input json

{
  "id": "123",
  "author": {"id": "1", "name": "Paul"},
  "title": "My awesome blog post",
  "comments": [
    {
      "id": "324",
      "commenter": {"id": "2", "name": "Nicole"}
    }
  ]
}

Normalize:

import 'package:normalizr/normalizr.dart';
import 'dart:convert';

// Define a users schema
final user = Entity('users');

// Define your comments schema
final comment = Entity('comments', {
  'commenter': Ref('users'),
});

// Define your article
final article = Entity('articles', {
  'author': Ref('users'),
  'comments': Ref.list('comments'),
});

void main() {
  // setup
  normalizr.addAll([user, comment, article]);
  
  final data = ... // some json

  // normalize json data
  final normalizedData = normalize(data, article);
  // output
  final encoder = JsonEncoder.withIndent('  ');
  String prettyJson = encoder.convert(normalizedData);
  print(prettyJson);
}

output:

{
  "result": "123",
  "type": "articles",
  "entities": {
    "users": {
      "1": {
        "id": "1",
        "name": "Paul"
      },
      "2": {
        "id": "2",
        "name": "Nicole"
      }
    },
    "comments": {
      "324": {
        "id": "324",
        "commenter": "2"
      }
    },
    "articles": {
      "123": {
        "id": "123",
        "author": "1",
        "title": "My awesome blog post",
        "comments": [
          "324"
        ]
      }
    }
  }
}

Features and bugs

Please file feature requests and bugs at the issue tracker.