How I can change structure of multiple arrays to array objects Node.js?

Question

(Variable file contains array of URL .json files). One file in subdirectories contains:

[ {"name": "John"} ]

Then I get common file get.json who contains all files from subdirectories in structure (yeap, I know it's not a valid JSON):

[ {"name": "John"} ]
[ {"name": "Sergei"} ]

I want get this file in this structure:

[ {name: "John"}, {name: "Sergei"} ]

My code

recursive(`${dirPath}`, ['delete.json', 'put.json'], function (err, file) {

  const write = fs.createWriteStream(`${dirPath}/get.json`);

  file.forEach(item => {
    fs.createReadStream(item).pipe(write);
  })

  write.on('finish', () => {
    fs.createReadStream(`${dirPath}/get.json`).pipe(res);
  })

});

[ {name: "John"}] [ {name: "Sergei"}] is not valid JSON. Is your sample data wrong, or are you asking how to parse this non-standard file format? — Quentin
– Quentin, Commented Jul 31, 2018 at 13:35
[ {name: "John"}] [ {name: "Sergei"}] - you claim this is JSON ... it isn't even close to JSON - if it were JSON, it'd look like [[ {"name": "John"}],[ {"name": "Sergei"}]] or [ {"name": "John"}, {"name": "Sergei"} ] — Jaromanda X
– Jaromanda X, Commented Jul 31, 2018 at 13:36
developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… — jmargolisvt
– jmargolisvt, Commented Jul 31, 2018 at 13:37
Yeap, it's not valid JSON. One file in subbdirectory contains code as: [ { name: "John} ], and when i I read all files and push them data in new, I get not valid JSON. How i can collect all this arrays in valid array objects? — CuteShaun
– CuteShaun, Commented Jul 31, 2018 at 13:39
Read line by line: parse each string/line to js object using the function JSON.parse, then get the object in index 0 and finally push it into an array. — Ele
– Ele, Commented Jul 31, 2018 at 13:56

CuteShaun · Accepted Answer · 2018-07-31 19:15:07Z

1

One day from my life left with this task, done!

recursive(`${dirPath}`, ['delete.json', 'put.json'], function (err, file) {

  const write = fs.createWriteStream(`${dirPath}/get.json`);

  const usersArr = [];

  let readStream;

  file.forEach(item => {
    readStream = fs.createReadStream(item);
    readStream.on("data", (data) => {
      JSON.parse(data).map(item => usersArr.push(item));
    });
  })

  readStream.on("end", (data) => {
    write.write(JSON.stringify(usersArr, null, " "), () => {
      console.log('Completed');
    });

    fs.createReadStream(`${dirPath}/get.json`).pipe(res)
  });

});

answered Jul 31, 2018 at 19:15

CuteShaun

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Comments

Sandro · Accepted Answer · 2018-07-31 16:50:45Z

0

const names = data.split('\n')
  .map(nameArrayString => (JSON.parse(nameArrayString)[0]))

answered Jul 31, 2018 at 16:50

Sandro

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1 Comment

Blue Over a year ago

Thank you for this code snippet, which might provide some limited, immediate help. A proper explanation would greatly improve its long-term value by showing why this is a good solution to the problem, and would make it more useful to future readers with other, similar questions. Please edit your answer to add some explanation, including the assumptions you've made.

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