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How can i calculate the size of JSON response in Restlet

sounds weird, but try stringifying the response and start counting bytes

if you have to be robust and support above ascii character points, go find something on npm like <https://www.npmjs.com/package/byte-length>

<@U5TF1GQ20> stringifying gives json data format. I am trying to measure the size to limit 10 mb response 

Have not decided yet but can be simple get call or put request with list of record ids. I mean can be simple get call or put request with json data as input

If json is your input, then a object must be your output

Stringify your output to estimate the number of bytes in it

Stringify convert json to string but is there any JavaScript function to convert the strings into number of bytes

You can try seeing if 2.1 has TextEncoder

But honestly you should probably be trying to limit your output by using paging

Sorry did not get to limit output using paging. External application want to call restlet and if understand correctly from external application mAke multiple calls to restlet and provide the response in smaller formats 

You have suggested to limit the output using paging. Just trying to understand what does it mean 

Divide your output into pages and make the request specify which page to return

For example , if there are 1000 search results, divide them into 10 pages of 100 search results

Return 1 page at a time and make the request specify which page to return

So external application to make first request to call the search and get the number of results say 1000 results and then make another 10 calls to the restlet to get 100 results each

plenty of ways to do it, the basic idea is to divide up your results

ill simply say that the usual approach is to return results in the first response and have the response include information that there are additional pages

You are right. Actually client is asking to have only one call to the rest let and it returns everything in one call which is technically not a scalable solution 