Answer to stackoverflow 61825263

README.md

This gist is to support the answer to this Stackoverflow 61825263 question

https://stackoverflow.com/questions/61825263/how-to-format-the-file-containing-json-objects-to-json-array

run it as the following code

node log-parser.js logfile.log

What you'll see on your screen is this:

[
  { Name: 'nom1', Cities: [ 'city1', 'city2' ] },
  { Name: 'nom2', Cities: [ 'city4', 'city5' ] },
  { Name: 'nom3', Cities: [ 'city3', 'city6' ] },
  { Name: 'nom4', Cities: [ 'city7', 'city8' ] },
  { Name: 'nom5', Cities: [ 'city9', 'cityA' ] },
  { Name: 'nom6', Cities: [ 'cityB', 'cityC' ] }
]

log-parser.js

const fs = require('fs')

async function fileToArray (file) {
  const fileContent = await fs.promises.readFile(file)
  const singleLined = fileContent
    .toString()
    .replace(/\n/g, '')
    .replace(/\}\{/g, '},{')
    .replace(/(\w+):/g, '"$1":')
    .replace(/'/g, '"')

  const array = JSON.parse(`[${singleLined}]`)
  console.log(array)
}

fileToArray(process.argv[2])

logfile.log

{
  Name:"nom1",
  Cities:['city1','city2']
}
{
  Name:"nom2",
  Cities:['city4','city5']
}
{
  Name:"nom3",
  Cities:['city3','city6']
}
{
  Name:"nom4",
  Cities:['city7','city8']
}
{
  Name:"nom5",
  Cities:['city9','cityA']
}
{
  Name:"nom6",
  Cities:['cityB','cityC']
}