Normalizes and denormalizes JSON according to schema for Redux and Flux applications

Usage no npm install needed!

<script type="module">
  import normalizr from '';


normalizr build status Coverage Status npm version npm downloads


Install from the NPM repository using yarn or npm:

yarn add normalizr
npm install normalizr


Many APIs, public or not, return JSON data that has deeply nested objects. Using data in this kind of structure is often very difficult for JavaScript applications, especially those using Flux or Redux.


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



Quick Start

Consider a typical blog post. The API response for a single post might look something like this:

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

We have two nested entity types within our article: users and comments. Using various schema, we can normalize all three entity types down:

import { normalize, schema } from 'normalizr';

// Define a users schema
const user = new schema.Entity('users');

// Define your comments schema
const comment = new schema.Entity('comments', {
  commenter: user

// Define your article
const article = new schema.Entity('articles', {
  author: user,
  comments: [comment]

const normalizedData = normalize(originalData, article);

Now, normalizedData will be:

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




Normalizr was originally created by Dan Abramov and inspired by a conversation with Jing Chen. Since v3, it was completely rewritten and maintained by Paul Armstrong. It has also received much help, enthusiasm, and contributions from community members.