Extract unique attributes from string in Javascript

Question

We have a string which I use for filter query. We need to extract the unique attribute keys from the string(For ex: z5,l3,d) from the below string. I'm trying to convert it to JSON format and extract it by using JSON.parse(). But it takes only the first object.

Is there any better way to achieve it?

let initialString = ""$or":[{"z5":"NEW"},{"z5":"OLD"}],"$or":[{"l3":"8125"}],"$or":[{"d":"20982056"}]"
let filteredString = initialString .replace(/[&\/\\#+()$~%.'*?<>]/g, '')
let finalString = `{"${filteredString .replace(/\\/g, '').substring(1, filteredString .length)}}`;
let jsonString= JSON.parse(finalString );

How can I get the attribute keys(z5,l3,d) from the string?

Kinglish · Accepted Answer · 2021-07-13 06:45:38Z

2

I wasn't sure if you wanted just an array of keys, or just the objects with those keys, so here both are...

let initialString = `""$or":[{"z5":"NEW"},{"z5":"OLD"}],"$or":[{"l3":"8125"}],"$or":[{"d":"20982056"}]"`

let finalJSON = [...initialString.match(/{(.*?)}/g, '')]
console.log(finalJSON)
console.log(finalJSON[1])

let keyArray = [... new Set(initialString.match(/{(.*?)}/g, '').map(e=>e.replace(/"/g,'')).map(e => e.split(":")[0].slice(1)))];
console.log(keyArray)

answered Jul 13, 2021 at 6:45

Kinglish

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1 Comment

Nikhil Bharadwaj Over a year ago

Just wanted the array of keys. Thanks for sharing both the solutions. This is simple and easy to use

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