Thanks for filing the issue!

@Reporter: Could you please share a sample file/URL which helps us to triage the issue.

This bug happened when I debug my api locally, the data is sorted in some
ways, the reponse has the same order as my code returns, but the preview do
not

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

This is the json data, you can write a local api which assumes return the
data in sample.json, then you can see the bug
postingMap is the sorted list, but response and preview dont have the same
order, response is right, but preview has wrong order

As per comment# 6 issue seems to be related to json file, which is out of scope for ET to create and triage the issue.

@Reporter: Could you please provide sample Test File/URL to test and triage the issue and if possible provide screencast of the issue which help in better understanding and further triaging it.

Thanks!

Thanks for filing the issue.

As shown in the screenshot provided by the issue reporter, "postingMap"'s value is a JSON object. According to JSON specification (http://www.rfc-editor.org/rfc/rfc7159.txt): "An object is an unordered collection ...", one cannot assume the order of the fields inside a JSON object.

Because when an object is stored the key-value pairs are stored in a hash map, there is no way to recover the original order when redisplayed in the preview panel. To preserve the order, one needs to use array instead of object.