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thisisjofrank merged 2 commits into from
Mar 6, 2026
Merged

docs: add TLS session debugging with SSLKEYLOGFILE #2953

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docs: add TLS session debugging with SSLKEYLOGFILE
bartlomieju Mar 4, 2026
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Merge branch 'main' into docs/sslkeylogfile-debugging
thisisjofrank Mar 5, 2026
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13 changes: 13 additions & 0 deletions runtime/fundamentals/debugging.md
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Expand Up @@ -201,3 +201,16 @@ including:
For full details on Deno's OpenTelemetry integration, including custom metrics,
traces, and configuration options, see the
[OpenTelemetry documentation](/runtime/fundamentals/open_telemetry).

## TLS session debugging

Set the `SSLKEYLOGFILE` environment variable to log TLS session keys to a file.
This enables you to decrypt and inspect encrypted network traffic with tools
like [Wireshark](https://www.wireshark.org/):

```sh
SSLKEYLOGFILE=./keys.log deno run -N main.ts
```

Then load `keys.log` in Wireshark (Edit > Preferences > Protocols > TLS >
(Pre)-Master-Secret log filename) to decrypt captured TLS traffic.