How to parse query string in react-router v4

Question

In react-router v3 I could access it with props.location.query.foo (if the current location was ?foo=bar)

In react-router-dom@4.0.0

Answer 1

Glad I found this post. Thanks for the links, after a couple of hours I finally got my code upgraded.

For those of you using query-string, you might have to do something like

var nameYouWant = queryString.parse(this.props.location.search).nameYouWant;

This happened in my case, and this.props.location.search.theUrlYouWant would refuse to work. The second option Tyler mentioned also worked for me with some similar tweaking.

Answer 2

I'm surprised no one has mentioned UrlSearchParam and the .get method.

Answer 3

Looks like you already assumed correct. The ability to parse query strings was taken out of V4 because there have been requests over the years to support different implementation. With that, the team decided it would be best for users to decide what that implementation looks like. We recommend importing a query string lib. The one you mentioned has worked great for me so far.

const queryString = require('query-string');

const parsed = queryString.parse(props.location.search);

You can also use new URLSearchParams if you want something native and it works for your needs

const search = props.location.search; // could be '?foo=bar'
const params = new URLSearchParams(search);
const foo = params.get('foo'); // bar

You can read more about the decision here

Answer 4

instead of installing a package you can use a simple function for extracting your query params.

//Param Extractor
const parseParams = (params = "") => {
  const rawParams = params.replace("?", "").split("&");
  const extractedParams = {};
  rawParams.forEach((item) => {
    item = item.split("=");
    extractedParams[item[0]] = item[1];
  });
  return extractedParams;
};

//Usage
const params = parseParams(this.props?.location?.search); // returns an object like:
// {id:1,name:john...}

Answer 5

Using third party package is overkill to simple solutions

componentDidMount() {
        const query = new URLSearchParams(
            this.props.location.search
        );

        let data= {};

        for (let params of query.entries()) {
            data[params[0]] = +params[1];
        }
        this.setState({ urldata: data});
    }

this will simply convert URL data into object.

Answer 6

I proffer my little ES6 shape function, awesome, light weight and useful:

getQueryStringParams = query => {
    return query
        ? (/^[?#]/.test(query) ? query.slice(1) : query)
            .split('&')
            .reduce((params, param) => {
                    let [key, value] = param.split('=');
                    params[key] = value ? decodeURIComponent(value.replace(/\+/g, ' ')) : '';
                    return params;
                }, {}
            )
        : {}
};

Every thing is here, hope to help you.