Question 290976 in Javascript Question posted in
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Get the specific value from the JSON string or object using javascript

I have an error message like following

Your card is declined due to "{n  "error": {n    "code": "card_declined",n    "decline_code": "insufficient_funds",n    "doc_url": "https://stripe.com/docs/error-codes/card-declined",n    "message": "Your card has insufficient funds.",n    "param": "",n    "request_log_url": "https://dashboard.stripe.com/test/logs/req_fhgKiF9C0d1RrK?t=1700727296",n    "type": "card_error"n  }n}n"

I want to fetch the value of decline_code that is insufficient_funds.

I am trying the below code. It gives me an error like

Bug in custom code TypeError: Cannot read properties of undefined (reading ‘decline_code’)

can you help me finding he solution as i dont know the javascript just trying from the different stackoverflow posts.

var err = Your card is declined due to "{n  "error": {n    "code": "card_declined",n    "decline_code": "insufficient_funds",n    "doc_url": "https://stripe.com/docs/error-codes/card-declined",n    "message": "Your card has insufficient funds.",n    "param": "",n    "request_log_url": "https://dashboard.stripe.com/test/logs/req_fhgKiF9C0d1RrK?t=1700727296",n    "type": "card_error"n  }n}n";

let obj = JSON.parse(err);
return (obj.error.decline_code);
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3

Answers


  1. 0

    You need to parse the JSON so it needs to be valid

    If it is impossible to fix this on the server (which it should) then you can do

    var err = `Your card is declined due to "{n  "error": {n    "code": "card_declined",n    "decline_code": "insufficient_funds",n    "doc_url": "https://stripe.com/docs/error-codes/card-declined",n    "message": "Your card has insufficient funds.",n    "param": "",n    "request_log_url": "https://dashboard.stripe.com/test/logs/req_fhgKiF9C0d1RrK?t=1700727296",n    "type": "card_error"n  }n}n"`;

err = err.slice(`Your card is declined due to "`.length,-1)
console.log(err)
let obj = JSON.parse(err);
console.log(obj.error.decline_code);
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  2. 0

    Since your string both contains normal text and json that needs to be parsed you could do something like this:

    const err = `Your card is declined due to "{n  "error": {n    "code": "card_declined",n    "decline_code": "insufficient_funds",n    "doc_url": "https://stripe.com/docs/error-codes/card-declined",n    "message": "Your card has insufficient funds.",n    "param": "",n    "request_log_url": "https://dashboard.stripe.com/test/logs/req_fhgKiF9C0d1RrK?t=1700727296",n    "type": "card_error"n  }n}n"`;
try {
  const obj = JSON.parse(err.substr(err.indexOf('{'))
  console.log(obj.error.decline_code)
} catch (e) {
  console.log(e.message)
}
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  3. 0

    Your getting error beacause JSON.parse parses only jsons. Your err is nor a json because of the ‘ Your card is declined due to ‘ section.

    // First you want to represent your err as a JSON object
var err = '{ "error": { "code": "card_declined", ///.../// "type": "card_error" } }';

// Now you can parse it
let obj = JSON.parse(err);
console.log(obj.error.decline_code); // Output: insufficient_funds

    In addition if you want to keep your error structure you can do something like this:

    const errIntro = 'Your card is declined due to '
console.log(errIntro + obj.error.decline_code); //Output: Your card is declined due to insufficient_funds

    If you want a clearer answer you can even remove the ‘_’ and you can also add a nice final point using:

    const errorCode = obj.error.decline_code.replace(/_/g, ' ');
console.log(errIntro + errorCode + '.'); //Output: Your card is declined due to insufficient funds.

    I hope it helps. 🙂

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