8000 feat: support customAttributeKeys in logger serializers by RafaelMeir4 · Pull Request #6405 · fastify/fastify · GitHub
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feat: support customAttributeKeys in logger serializers #6405

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feat: support customAttributeKeys in logger serializers #6405

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@RafaelMeir4 RafaelMeir4 commented Dec 4, 2025

Closes #4413

Summary

This PR adds support for customAttributeKeys option in the logger configuration, allowing users to customize the attribute keys used in log records (req, res, err).

This is particularly useful for cloud logging platforms like Google Cloud Logging, which expect specific field names (e.g., httpRequest instead of req).

Example Usage

const fastify = require('fastify')({
  logger: {
    level: 'info',
    customAttributeKeys: {
      req: 'httpRequest',
      res: 'response',
      err: 'error'
    },
    serializers: {
      req: function (req) {
        return {
          requestMethod: req.method,
          requestUrl: req.url,
          userAgent: req.headers['user-agent'],
          remoteIp: req.headers['x-forwarded-for']
        }
      }
    }
  }
})

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@github-actions github-actions bot added the documentation Improvements or additions to documentation label Dec 4, 2025
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Support pino logger customAttributeKeys to replace existing req res reqId log record fields

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