It is sometimes easier to export a chrome har file into CSV format so that it can be opened in Excel. Once opened in Excel it is really easy to do further analysis for rather very large har dumps.

The following solution is based on this Link: https://stackoverflow.com/questions/31648078/how-to-import-har-file-to-excel

Install jq on Mac.

brew install jq

Run this command.

cat some_file.har | jq '[ "URL", "Time", "Wait time", "Status", "Body size","Content-Type", "Content-Encoding"],
    (.log.entries[] | [
        .request.url,
        .time,
        .timings.wait,
        .response.status,
        .response.content.size,
        .response.content.mimeType,
        .response.content.encoding
]) | @csv' | sed 's/\\"//g' | sed 's/"//g' > some_file.csv

This results in a CSV file which you can easily open in an Excel.

To extract the path of the URL minus the file name the following Excel function can be used by adding a column:

=LEFT(A2,LEN(A2)-LEN(RIGHT(A2,LEN(A2)-FIND("@",SUBSTITUTE(A2,"/","@",LEN(A2)-LEN(SUBSTITUTE(A2,"/",""))),1))))