How can I extract a json from a string in javascript

Question

I need to extract json from a particular string which looks like this:

'loglocale=
{
    "seed": "pqr",
    "pageHashCode": "xxx",
    "timestamp": 1553589859880,
    "channel": "mobile",
    "serviceVersion": "1.0",
    "language": "en-CHN"
}
; regStatus=xx; s_dslv=34; s_fid=65-64748; s_vn=64678%26vn%3D1',
  groups: undefined ]

I have tried this but could not extract it .

var regex=cookies.match(/{"seed":(\w|\W)*"channel":(\w|\W)*}/);

What is the solution I could use? Thanks in advance:)

Is the leading ' and stuff after the ; actually part of the string? Do you have access to the actual JSON data? It's best to use JSON.parse rather than regex if possible. You could use JSON.parse(s.match(/({.+?})/ms)[0]); if the string is verbatim as in your post. — ggorlen
– ggorlen, Commented Dec 7, 2019 at 19:33

djfdev · Accepted Answer · 2019-12-09 08:15:30Z

1

If you know there is only a single plain JSON object like this in the string, you can use this regex to capture the curly braces and everything in between:

const curlyBracesInclusive = /\{([^}]+)\}/
const arr = string.match(curlyBracesInclusive)
// arr[0] will be a the JSON string, if one was found

This is no way guarantees the string is valid JSON. So if you want to run JSON.parse on the result, be aware it will throw an error if the string is invalid.

edited Dec 9, 2019 at 8:15

answered Dec 7, 2019 at 19:39

djfdev

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Von Watchmaker · Accepted Answer · 2019-12-07 19:39:19Z

1

For the loglocale:

let dataJSON = `
'loglocale=
{
    "seed": "pqr",
    "pageHashCode": "xxx",
    "timestamp": 1553589859880,
    "channel": "mobile",
    "serviceVersion": "1.0",
    "language": "en-CHN"
}
; regStatus=xx; s_dslv=34; s_fid=65-64748; s_vn=64678%26vn%3D1',
  groups: undefined ]`

then:

let string = dataJSON.substring(
       dataJSON.indexOf("loglocale=") + 10, 
       dataJSON.lastIndexOf("; regStatus")
   )
JSON.parse(string);

answered Dec 7, 2019 at 19:39

Von Watchmaker

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