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I am using Google chrome's developer tools to inspect the timeline of some requests. There is the option of storing them as a .HAR file, but I could not find anything that opens it. In a browser, it looks like a simple text file.

Does anybody know how to save Developer Tool's data in a suitable format or how to open .HAR files?

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The HTTP Archive format (HAR) format is intended to be a format for sharing HTTP data across tools. Although there are a bunch of tools that support HAR & allow exporting, only a few among those appear to allow import:

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Is there any way to open this directly with Chrome? – Pacerier Dec 29 '14 at 8:32
    
@Pacerier Yes. It's just a JSON file. – Cees Timmerman Jul 10 '15 at 8:11
    
This has always baffled me - why does Chrome allow you to save HAR files but not open them? – Monkpit Jul 21 at 18:59

.har seems to be an HTTP Archive Spec file. You can use HTTP Watch to open such files. FWIW those are JSON files

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Httpwatch v8.5 throws exception on Chrome 32 .har trace. "onContentLoad value in /pageTimings is not an integer value :( Im using this one: ericduran.github.io/chromeHAR – felickz Feb 10 '14 at 15:34

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