Writing JSON object to a JSON file with fs writeFileSync

Question

I am trying to write a JSON object to a JSON file  The code executes without errors  but instead of the content of the object been written  all that gets written into the JSON file is    object Object    This is the code that actually does the writing   fs writeFileSync     data phraseFreqs json   output     output  is a JSON object  and the file already exists  Please let me know if more information is required

User · Accepted Answer

You need to stringify the object   fs writeFileSync     data phraseFreqs json   JSON stringify output

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to open a local file or url with chrome  i used  const open   require  open       npm i open    open  http   google com   open  build mytest index html    app   quot chrome exe quot

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Here s a variation  using the version of fs that uses promises   const fs   require  fs     await fs promises writeFile     data phraseFreqs json   JSON stringify output       UTF-8 is default

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Make the json human readable by passing a third argument to stringify   fs writeFileSync     data phraseFreqs json   JSON stringify output  null  4

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When sending data to a web server  the data has to be a string  here   You can convert a JavaScript object into a string with JSON stringify     Here is a working example   var fs   require  fs     var originalNote       title   Meeting     description   Meeting John Doe at 10 30 am      var originalNoteString   JSON stringify originalNote    fs writeFileSync  notes json   originalNoteString    var noteString   fs readFileSync  notes json     var note   JSON parse noteString    console log  TITLE    note title  DESCRIPTION    note description       Hope it could help

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I don t think you should use the synchronous approach  asynchronously writing data to a file is better also stringify the output if it s an object    Note  If output is a string  then specify the encoding and remember the flag options as well    const fs   require  fs    const content   JSON stringify output    fs writeFile   tmp phraseFreqs json   content   utf8   function  err        if  err            return console log err              console log  The file was saved            Added Synchronous method of writing data to a file  but please consider your use case  Asynchronous vs synchronous execution  what does it really mean   const fs   require  fs    const content   JSON stringify output    fs writeFileSync   tmp phraseFreqs json   content

[json] Writing JSON object to a JSON file with fs.writeFileSync

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