[mergingObject] under custom property

[stychu]

Hello,
Im struggling a bit with how I could nest my logs under the custom property in the log.
For example logContext as custom prop and a log with [mergingObject] as log.info({some: 'asd'}, 'abc')
I would Like it to be logged as
{pid: 1, hostname: 'asdsd', msg: 'abc', logContext: {some: 'asd'}}
How I can do that?
I've tried with formatters.log option as

  formatters: {
    log: (object) => {
      return { logContext: object }
    },
  }

But it breaks logging with errors (errors are swallowed).

[mcollina]

Can you include a full example showing errors that are swallowed?

[stychu]

@mcollina

// logger
const loggerInstance = pino({
  level: env.LOGGER_LOG_LEVEL,
  timestamp: () => `,"timestamp":"${new Date(Date.now()).toISOString()}"`,
  errorKey: 'error',
  formatters: {
    level: (label) => {
      return { level: label.toUpperCase() };
    },
     log: (object) => {
      return { logContext: object };
    },
  },
  redact: ['req.headers', 'res.headers'],
});

const logger = loggerInstance.child(
  { kind: 'application' },
  { msgPrefix: '[APP] ' },
);

export const getLogger = (subKind: string) =>  logger.child({ subKind: subKind });

export const httpLogger = pinoHttp({
  logger: loggerInstance.child({ kind: 'access' }),
  msgPrefix: '[HTTP] ',
});

export const serverLogger = getLogger('server');
export const oidcLogger = getLogger('oidc');
export const trpcLogger = getLogger('trpc');

and for example doing

serverLogger.error(new Error('first error'), 'first err');
serverLogger.error({ error: new Error('second error') }, 'second err');

---
[19:36:20.085] ERROR (51006): [APP] first err
    kind: "application"
    subKind: "server"
    logContext: {
      "error": {}
    }
[19:36:20.086] ERROR (51006): [APP] second err
    kind: "application"
    subKind: "server"
    logContext: {
      "error": {}
    }

[stychu]

@mcollina any suggestion how can I put all logs under someprop ??

[bngarren]

@stychu Take a look at nestedKey option.