In my node.js server i have a URL variable.

It is either in the form of ";, or "URL/USEFUL_PART/blabla".

From this, i want to extract only the 'USEFUL_PART' information.

How do i do that with Javascript?

I know there are two ways to do this, one with vanilla js and one with regular expressions. I searched the web but i only found SO solutions to specific questions. Unfortunately, i coulnd't find a generic tutorial i could replicate or work out my solution.

In my node.js server i have a URL variable.

It is either in the form of "https://www.URL./USEFUL_PART/blabla", or "URL./USEFUL_PART/blabla".

From this, i want to extract only the 'USEFUL_PART' information.

How do i do that with Javascript?

I know there are two ways to do this, one with vanilla js and one with regular expressions. I searched the web but i only found SO solutions to specific questions. Unfortunately, i coulnd't find a generic tutorial i could replicate or work out my solution.

• javascript
• node.js

Share Improve this question Follow edited Jul 4, 2023 at 10:24 user1584421 asked Oct 5, 2019 at 18:00 user1584421user1584421 3,8931212 gold badges5757 silver badges9898 bronze badges 3

• 2 This is extremely mon in http framework routing, you could checkout express or hapi to see how they handle this :) – dm03514 Commented Oct 5, 2019 at 18:02
• I am using Express – user1584421 Commented Oct 5, 2019 at 18:03
• 2 Did u tried req.params? – Ilijanovic Commented Oct 5, 2019 at 18:06

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4 Answers 4

Sorted by: Reset to default 2

Since you're using Express, you can specify the part of the URL you want as parameters, like so:

app.get('/:id/blabla', (req, res, next) => {
  console.log(req.params); // Will be { id: 'some ID from the URL']
});

See also: https://expressjs./en/api.html#req.params

Hey if you are using express then you can do something like this

app.get('/users/:id/blabla',function(req, res, next){
   console.log(req.params.id);
 }

Another way is to use javascript replace and split function

str = str.replace("https://www.URL./", "");
str = str.split('/')[0];

In Node.js you can use "URL"
https://nodejs/docs/latest/api/url.html

const myURL = new URL('https://example/abc/xyz?123');
console.log(myURL.pathname);
// Prints /abc/xyz

One way is to check whether the url starts with http or https, if not then manually add http, parse the url using the URL api, take the patname from parsed url, and get the desired part

let urlExtractor = (url) =>{
  if(!/^https?:\/\//i.test(url)){
    url = "http://" + url
  }
  let parsed = new URL(url)
  return parsed.pathname.split('/')[1]
}

console.log(urlExtractor("https://www.URL./USEFUL_PART/blabla"))
console.log(urlExtractor("URL./USEFUL_PART/blabla"))