state-as-querystring

Save your application state in query string between page views.

String, Number and Boolean and Array values will be saved as is, while object values will be encoded as JSON.

Usage

Idea is simple. When state in initiated, we read it from the query string. Whenever it changes, we write it to the query string. This keeps start between page views and allows sharing urls of a given state.

Try here

React example

import { saveStateToURL, readStateFromURL } from "state-as-querystring";

class App extends React.Component {
  // read state from url when initializing the store
  constructor(props) {
    super(props);
    this.state = readStateFromURL();
  }
  
  //save state to url when state is changed
  componentDidUpdate() {
    saveStateToURL(this.state);
  }

  render() {
    return (
        <textarea
          value={this.state.text}
        />
    );
  }
}

Redux example

import { saveStateToURL, readStateFromURL } from "state-as-querystring";

// read state from url when initializing the store
const store = createStore(reducer, readStateFromURL());

// save state to url when state changes 
store.subscribe(() => saveStateToURL(store.getState()));

A bit more complex example - with arrays in the state + partial syncing of the state.