mitmproxy to export web traffic as JSON

Trying to save the captured web traffic of the raw HTTP request/response while using mitmproxy:

Followed https://github.com/mitmproxy/mitmproxy/blob/main/examples/contrib/jsondump.py with
mitmproxy -s /pkg/mitmproxy/jsondump.py, and with
```
  $ cat ~/.mitmproxy/config.yaml
  dump_destination: "/tmp/mitmproxy.log.json"
```
But my "/tmp/mitmproxy.log.json" was never written to.
Then tried mitmproxy -w outfile as per Dump packets collected with mitmproxy, but the output is not in JSON format
Then tried mitmproxy -s /pkg/mitmproxy/jsondump.py -w outfile and the output is still not in JSON format.

Solution

Mitmproxy currently has no JSON export. We're tentatively planning to support HAR export soon though. There's a community-contributed example for this here, which I think is in better shape than the jsondump one: https://github.com/mitmproxy/mitmproxy/blob/main/examples/contrib/har_dump.py