How can I pretty-print JSON using node js

Question

This seems like a solved problem but I am unable to find a solution for it   Basically  I read a JSON file  change a key  and write back the new JSON to the same file  All works  but I loose the JSON formatting So  instead of       name  test     version  1 0      I get   name  test  version  1 1     Is there a way in Node js to write well formatted JSON to file

User · Accepted Answer

JSON stringify s third parameter defines white-space insertion for pretty-printing  It can be a string or a number  number of spaces   Node can write to your filesystem with fs   Example   var fs   require  fs     fs writeFile  test json   JSON stringify   a 1  b 2  c 3    null  4       test json          a   1        b   2        c   3         See the JSON stringify   docs at MDN  Node fs docs

User · Answer

I know this is old question  But maybe this can help you  JSON string var jsonStr       quot bool quot   true   quot number quot   123   quot string quot    quot foo bar quot       Pretty Print JSON JSON stringify JSON parse jsonStr   null  2    Minify JSON JSON stringify JSON parse jsonStr

User · Answer

If you don t want to store this anywhere  but just view the object for debugging purposes   console log JSON stringify object  null            You can change the third parameter to adjust the indentation

User · Answer

If you just want to pretty print an object and not export it as valid JSON you can use console dir     It uses syntax-highlighting  smart indentation  removes quotes from keys and just makes the output as pretty as it gets   const jsonString      name   John   color   green                         smoker  false  id  7  city   Berlin    const object   JSON parse jsonString   console dir object   depth  null  colors  true       Under the hood it is a shortcut for console log util inspect        The only difference is that it bypasses any custom inspect   function defined on an object

User · Answer

what about this   console table object

User · Answer

Another workaround would be to make use of prettier to format the JSON  The example below is using  json  parser but it could also use  json5   see list of valid parsers  const prettier   require  quot prettier quot    console log prettier format JSON stringify object    semi  false  parser   quot json quot

User · Answer

I think this might be useful    I love example code     var fs   require  fs     var myData       name  test     version  1 0     var outputFilename     tmp my json    fs writeFile outputFilename  JSON stringify myData  null  4   function err        if err          console log err         else         console log  JSON saved to     outputFilename

[json] How can I pretty-print JSON using node.js?

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