Please help us understand how to configure log output in json format or how to integrate JSreport logs with Kibana?

To enable json for all transports, add a default logging config to jsreport.config.json.

 "logger": {
    "console": {
      "transport": "console",
      "level": "debug"
    },
    "file": {
      "transport": "file",
      "level": "debug",
      "filename": "logs/log.txt"
    },
    "error": {
      "transport": "file",
      "level": "error",
      "filename": "logs/error.txt"
    }
  },

And the update the app server.js file with the following. It will instruct all transports to format in json.

const jsreport = require('jsreport')()

if (process.env.JSREPORT_CLI) {
  // export jsreport instance to make it possible to use jsreport-cli
  module.exports = jsreport
} else {
  jsreport.afterConfigLoaded(() => {
    const winston = require('winston')
    jsreport.logger.format = require('winston').format.combine(
      jsreport.logger.format,
      winston.format.json()
    )
  })
  jsreport.init().then(() => {
    // running
  }).catch((e) => {
    // error during startup
    console.error(e.stack)
    process.exit(1)
  })
}