This script parses the JSON produced by Chrome’s Timeline.
You can call the script with either a directory or a file, as well as an event message name.
For example:
node index.js ~/file.json "Event name"
…will output all the timestamps for that event name to the console.
Similarly:
node index.js ~/files/ "Event name"
…will parse all the files in that directory and output the timestamps to the console.