Decode base64 url parameters with jquery

Question

I want to be able to take a base64 encoded url string and retrieve the name and descriptor parameter values from it in jquery.

I have it working with the parameters not base64 encoded by getting the url string as an array and then lifting out the values of the 2 parameters (name and descriptor) - but when I base64 encode the parameters in the url, I can decode the string, but it comes back as a string and not an array so I cant lift out the values of the name and descriptor parameters.

so url would be https://example.com?name=fred&descriptor=Boss and encoded to base64 https://example.com?P25hbWU9ZnJlZCZkZXNjcmlwdG9yPUJvc3M=

So from https://example.com?P25hbWU9ZnJlZCZkZXNjcmlwdG9yPUJvc3M= how can I get the values of name and descriptor in jquery and set them as variables?

Maybe its easier to not get an array from the decoded version, and just use jquery to get the values after the "+" atob decoding?

aloisdg · Accepted Answer · 2024-12-04 13:23:41Z

2

Another solution inspired by @Hackerman's answer with URL and URLSearchParams. Note that this solution rely on native API without any need of magic string:

const url = 'https://example.com?P25hbWU9ZnJlZCZkZXNjcmlwdG9yPUJvc3M='
const encodedUrl = new URL(url);
const decodedQuery = atob(encodedUrl.searchParams); 
const params = new URLSearchParams(decodedQuery)

// get name and descriptor
fetchedName = params.get("name");
fetchedDescriptor = params.get("descriptor");

console.log(fetchedName)
console.log(fetchedDescriptor)

// get all entries
const entries = new URLSearchParams(decodedQuery).entries()

for (const [key, value] of entries) {
  console.log(`${key}, ${value}`);
}

edited Dec 4, 2024 at 13:23

answered Nov 27, 2024 at 15:08

aloisdg

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4 Comments

dubbs Dec 3, 2024 at 12:56

Thanks for this - I think your solution might work better as the other one is reliant on both parameters appearing in the url string and being set in order - can you help me with a more specific answer to my question on how this approach would work fo my two parameters name and descriptor please?

aloisdg Dec 3, 2024 at 16:28

did you try this answer? It does use your two parameters name and descriptor

dubbs Dec 3, 2024 at 16:28

yes I did, but i need to be able to pass the values of the parameters to 2 different variables - but I am unsure on how to do this based on your solution. e.g. I want to get the value of name= into a jquery variable called fetchedName and the value of descriptor= into a jquery variable called fetchedDescriptor

aloisdg Dec 4, 2024 at 13:23

@dubbs alright. updated.

Hackerman · Accepted Answer · 2024-11-28 14:42:54Z

1

You don't need JQuery to do that, you can use vanilla Javascript if you want:

let url = 'https://example.com?P25hbWU9ZnJlZCZkZXNjcmlwdG9yPUJvc3M='
let encodedUrl = url.split('?')[1]
let decoded = atob(encodedUrl)
let arrValues = decoded.split('&')
console.log('Name', arrValues[0].split('=')[1])
console.log('Description', arrValues[1].split('=')[1])

Just remember to use the atob function https://developer.mozilla.org/en-US/docs/Web/API/Window/atob

edited Nov 28, 2024 at 14:42

answered Nov 27, 2024 at 14:59

Hackerman

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4 Comments

dubbs Over a year ago

This only seems to get the first parameter? - dont worry, got it working actually.

dubbs Over a year ago

Only problem I have now is that the value of the parameters if they include spaces comes through with %20

dubbs Over a year ago

I used decodeURI to resolve this

dubbs Dec 3, 2024 at 13:43

Is there a way to adapt this so it works when only 1 of the 2 parameters is set and not reliant on them being set with name first?

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