sebsto
January 18, 2026, 8:13pm
1
Hello,
We would like to add support for structured JSON logging in the Lambda Runtime for Swift.
The proposal is available here, please share your thoughts and comments.
# Structured JSON Logging Support for swift-aws-lambda-runtime
AWS Lambda supports [advanced logging controls](https://docs.aws.amazon.com/lambda/latest/dg/monitoring-cloudwatchlogs-logformat.html) that enable functions to emit logs in JSON structured format and control log level granularity. The Swift AWS Lambda Runtime should support these capabilities to provide developers with enhanced logging, filtering, and observability features.
## Overview
Versions:
- v1 (2025-01-18): Initial version
### Motivation
#### Current Limitations
##### Unstructured Logging Format
Currently, the Swift runtime emits logs in plaintext (unstructured) format only. This creates several limitations:
- No native support for JSON structured logging
- Difficult to query and filter logs programmatically
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Thank you
With the LogHandler being internal and not public, how can adopters who today use a different LogHandler participate in this feature? Could the log handler type be potentially made public so that adopters can set up a multiplexing log handler and use both?
sebsto
January 20, 2026, 8:17am
3
Thank you Honza, this is exactly the type of feedback I was looking for. I will adjust the proposal doc asap.
The doc is adjusted.
2 Likes
benrosen78
January 28, 2026, 11:39pm
4
I’ve reviewed this proposal with my team and we are very excited about the introduction of structured JSON logging. Looks good to us.
4 Likes