Exploring objects as strings to retrieve data with Javascript

In a scenario where I receive an object of varying length that I do not control, I am required to extract specific data from it.

The response I receive is in the form of a formatted string:

{
    "questionId": 18196101,
    "externalQuestionId": "bcc38f7d30ea44ad908d8166dafa5556",
    "category": "Employment Law",
    "secondaryCategory": "",
    "partnerName": "",
    "questionTitle": "I sold my business but was offered a job with the company as",
    "questionText": "I sold my business but was offered a job with the company as manager..."
}

The string representation is: 

'{"questionId":18196101,"externalQuestionId":"bcc38f7d30ea44ad908d8166dafa5556","category":"Employment Law","secondaryCategory":"","partnerName":"","questionTitle":"I sold my business but was offered a job with the company as","questionText":"I sold my business but was offered a job with the company as manager..."}'

Given that I have access to both the questionTitle and questionText, I can search for their indexes within the string. This becomes necessary since this object may be embedded in a larger response at different positions.

The extraction task involves retrieving the externalQuestionId, such as 

"bcc38f7d30ea44ad908d8166dafa5556"
in this example.

Due to the dynamic nature of the numbers involved, identifying the indexes of known parameters is crucial.

Essentially, with knowledge of the starting index of questionTitle, the challenge is to locate the nearest occurrence of externalQuestionId.

javascriptjsonstringobjectindexof

Answer №1

Special thanks to @nnnnnn for recommending the utilization of the .lastIndexOf() method.

For my specific situation, I devised a straightforward function that takes the complete text and a specific fragment as parameters, then extracts the necessary data.

function obtainQuestionId(fullText, textFragment) {
var newString = fullText.substr(fullText.lastIndexOf("externalQuestionId", fullText.indexOf(textFragment)));
return newString.substr(21, newString.indexOf(",") - 22);
}

var str = '{"questionId":18196101,"externalQuestionId":"bcc38f7d30ea44ad908d8166dafa5556","category":"Employment Law","secondaryCategory":"","partnerName":"","questionTitle":"I sold my business but was offered a job with the company as","questionText":"I sold my business but was offered a job with the company as manager..."}'
var frag = 'I sold my business but was offered a job with the company as","questionText":"I sold my business b';

console.log(obtainQuestionId(str, frag));

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