Convert a string of an array to an array js

Question

Why cant i convert this arr

let stringarr = "[2022/07/12, 2022/08/09]"

to this arr

let arr = JSON.parse(stringarr) ---> error

Unexpected token / in JSON at position 5

@Barmar what if i dont have them. what can i do then to convert it to an array — mouchin777
– mouchin777, Commented Jul 21, 2022 at 13:59
Fix the source of that data. It'll likely be much easier than writing a parser — evolutionxbox
– evolutionxbox, Commented Jul 21, 2022 at 14:00
Adding quotes wont work either tho let stringarr = "['2022/07/12', '2022/08/09']" let arr = JSON.parse(stringarr) error — mouchin777
– mouchin777, Commented Jul 21, 2022 at 14:01

Barmar · Accepted Answer · 2022-07-21 14:01:48Z

5

It's not valid JSON, since the array elements aren't quoted.

If the array elements are all dates formatted like that, you could use a regular expression to extract them.

let stringarr = "[2022/07/12, 2022/08/09]"
let dates = stringarr.match(/\d{4}\/\d{2}\/\d{2}/g);
console.log(dates);

answered Jul 21, 2022 at 14:01

Barmar

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Comments

KooiInc · Accepted Answer · 2022-07-21 14:17:09Z

1

what can i do then to convert it to an array

There are several ways to do that, if the format of the string stays like this. Here's an idea.

console.log(`[2022/07/12, 2022/08/09]`
  .slice(1, -1)
  .split(`, `));

Or edit to create a valid JSON string:

const dateArray = JSON.parse(
  `[2022/07/12, 2022/08/09]`
    .replace(/\[/, `["`)
    .replace(/\]/, `"]`)
    .replace(/, /g, `", "`));
    
console.log(dateArray);

Or indeed use the match method @Barmar supplied.

edited Jul 21, 2022 at 14:17

answered Jul 21, 2022 at 14:04

KooiInc

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Vivek Kumar · Accepted Answer · 2022-07-21 14:28:18Z

0

const regexp = /\d+\/\d+\/\d+/g;
const stringarr = "[2022/07/12, 2022/08/09]";

const arr = [...stringarr.matchAll(regexp)];
console.log(arr)

edited Jul 21, 2022 at 14:28

answered Jul 21, 2022 at 14:26

Vivek Kumar

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Comments

ArtBindu · Accepted Answer · 2022-07-21 22:26:35Z

0

It's to much simple 😄.

As your input is a valid array in string format. So, remove [ ] brackets and split with comma (,). Then it automatically generates an array.

let stringarr = "[2022/07/12, 2022/08/09]";
let arr = stringarr.replace(/(\[|\])/g, '').split(',');

Output:

['2022/07/12', ' 2022/08/09']

answered Jul 21, 2022 at 22:26

ArtBindu

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