Receiving a k6 response that includes a JSON object with a lengthy integer value

During a performance test, I encountered an issue where the response contained items like:

{"item":{"id":2733382000000000049}}

When parsed using k6's response.json(), it appeared as :

{"item":{"id":2733382000000000000}}

This resulted in the last digits being replaced with 0s. Additionally, attempting to log the response.body() produced an error:

ERRO[0001] TypeError: Value is not an object: {"item":{"id":2733382000000000049}}

It seems that JavaScript has limitations in handling large integers, as shown by the maximum safe integer value:

> console.log(Number.MAX_SAFE_INTEGER)
9007199254740991

Is there any way to work around this limitation in k6 without making changes to the backend code?

javascriptjsonk6

Answer №1

Try using response.text() in place of your current code, as it may allow you to perform the desired action

// The 'text' variable will contain the response from response.text()
const text = '{"item":{"id":2733382000000000049}}'
const fix = text.replace(/(\d{15,})/g, '"$1"');
console.log(JSON.parse(fix))

It's important to note that without knowing the full JSON structure you are working with, this solution may be simplistic.

However, based on the information provided, it should function correctly.

Answer №2

Here is a possible solution:

To ensure accuracy, preprocess the string received from the API by converting it to a string before parsing. Alternatively, you can revert it back to a number based on your requirements. Below is a regular expression (RegExp) that converts all numbers in the string (preceded with :) into strings:

 // Ensure precision by converting number fields into strings
 // : 922271061845347495, => : "922271061845347495",
 stringFromApi = stringFromApi.replace(/:\s*(-?\d+),/g, ': "$1",');

Explanation of the RegExp:

\s* represents any number of spaces
-? indicates one or zero occurrences of '-' (for negative numbers)
\d+ signifies one or more digits
(...) denotes the captured value stored in the $1 variable

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