Question 53564 in Javascript Question posted in
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How to extract a set of numbers from variable that returns a string – Javascript

I’m currently trying to parse out a 6-digit verification code that is being sent in an API request’s response body along with some text.

For example:

GET -> https://api.twilio/com/...

The response body returns something like this:

 "body": "Your code is 123456."

I’m parsing via JSONpath ($.messages[0].body) and saving that string ("Your code is {number}") as a variable.

I’m trying to figure out how to then take that saved variable and parse out just the set of numbers from the string.

I’ve done a lot of stuff, but this is all new to me and I’m learning as I go.

Tags:

3

Answers


  1. 0

    You can extract the value ‘123456’ from the given JSON object by using a regular expression like so:

    // Assuming you have the JSON object
const data = {
  messages: [
    {
      body: 'Your code is 123456.',
    },
  ],
};

// Access the 'body' property in the JSON object
const messageBody = data.messages[0].body;

// Use a regular expression to extract the number
const code = parseInt(messageBody.match(/d+/)[0], 10);

console.log(code); // Output: 123456
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  2. 0

    You can use regex to extract the number: $.messages[0].body.match(/(d+)/)[1]

    const response = {
  messages: [
     {
       body: 'Your code is 123456.'
     }
  ]
};

console.log(response.messages[0].body.match(/(d+)/)[1]);
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  3. 0

    If you know the structure of the response will always be consistent, you can use str.splice() to get the specific answer and use Number() to make it a number data type. So if the response is like what you said and you’ve saved the answer to a variable called responseStr. You can do

    let code = Number(responseStr.splice(13, 19)) //expect code = 123456

    Since it is always a 6-digit code, the start index (13) and end index of the code (18) will remain the same. The second parameter should be end index + 1 since the splice is exclusive of the index of the second parameter.

    However, if the response may have a different structure but you are sure the code is always a 6-digit verification code, you can use REGEX to find the string and convert it to a number data type. So something like

    let matchArr = responseStr.match(/[0-9]{6}/g) //expect matchArr = ["123456"]
let code = Number(matchArr[0]) //expect code = 123456

    where /[0-9]{6}/g is the regex for 6-digit number. But you’ll need to make sure it is the only number of 6-digit or more in the response or matchArr will contain all the combination of substrings that is a 6-digit number or you will need to modify the REGEX to create a more specific match.

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