Question:How to get the response body in hapi-pino logs?

[veerugp]

My code is a follows:

'use strict';

const hapi = require('@hapi/hapi')
const HapiPino = require('hapi-pino')

const server = hapi.server({ port: 3000 })

server.route([
  {
    method: 'POST',
    path: '/response',
    handler:(request, h) => {
      return {'test':'Resp Msg'}
    }
  },
]);

function resSerializer(res) {
  return {
      body:res.raw.body
  };
}

(async () => {
  try {
    await server.register({
      plugin: HapiPino,
      options: {
        logPayload: true,
        serializers:{
          res: resSerializer
        },       
      }
    })
    await server.start()
    console.log('Server started successfully')
  } catch (err) {
    console.error(err)
  }
})()

Logs are as shown as below:

{"level":30,"time":1598811397374,"pid":15504,"hostname":"IN5CG7192BNG","req":{"id":"1598811397349:IN5CG7192BNG:15504:kehf0ria:10000","method":"post","url":"/response","headers":{"content-type":"application/json","user-agent":"PostmanRuntime/7.6.0","accept":"*/*","host":"localhost:3000","accept-encoding":"gzip, deflate","content-length":"50","connection":"keep-alive"},"remoteAddress":"127.0.0.1","remotePort":61801},"payload":{"test1":"JVA","test2":"JVA","test3":"JVA"},"req":{"id":"1598811397349:IN5CG7192BNG:15504:kehf0ria:10000","method":"post","url":"/response","headers":{"content-type":"application/json","user-agent":"PostmanRuntime/7.6.0","accept":"*/*","host":"localhost:3000","accept-encoding":"gzip, deflate","content-length":"50","connection":"keep-alive"},"remoteAddress":"127.0.0.1","remotePort":61801},"res":{},"responseTime":24,"msg":"request completed"}

Response body is showing as "res":{}

How to get the response body value, which is {'test':'Resp Msg'}

[abeluck]

The docs say this about the logPayload option:

When enabled, add the request payload as payload to the response event log.

So it seems to be to be intended that only the request payload is logged, not the response.

However I'd also like to be able to log the response payload for troubleshooting purposes, there doesn't seem to be an option for this.

[SeRodrigalvarez]

You can do this with a formatter:

import _ from "lodash";

const plugin = {
    plugin: require("hapi-pino"),
    options: {
        formatters: {
            log(object: any) {
                const body = _.get(object, "req.response.source");
                if (body) {
                    return {
                        ...object,
                        body,
                    };
                } else {
                    return object;
                }
            }
        }
    },
};

https://getpino.io/#/docs/api?id=formatters-object

[fcesgpfedef]

very helpful. Thanks