Responding with a JSON object in Node js converting object array to JSON string

Question

I m a newb to back-end code and I m trying to create a function that will respond to me a JSON string  I currently have this from an example  function random response      console log  Request handler  random was called       response writeHead 200    Content-Type    text html        response write  random numbers that should come in the form of json      response end        This basically just prints the string  random numbers that should come in the form of JSON   What I want this to do is respond with a JSON string of whatever numbers  Do I need to put a different content-type  should this function pass that value to another one say on the client side   Thanks for your help

User · Answer

var objToJson        objToJson response   response  response write JSON stringify objToJson      If you alert JSON stringify objToJson   you will get   response   value

User · Answer

const http   require  http    const url   require  url     http createServer  req res   gt        const parseObj    url parse req url true       const users     id 1 name  soura    id 2 name  soumya         if parseObj pathname      user-details   amp  amp  req method     GET             let Id   parseObj query id          let user details               users forEach  data index   gt               if data id    Id                   user details   data                                   res writeHead 200   x-auth-token   Auth Token            res write JSON stringify user details      Json to String Convert         res end             listen 8000     I have used the above code in my existing project

User · Answer

Per JamieL s answer to another post      Since Express js 3x the response object has a json   method which sets   all the headers correctly for you       Example   res json   foo    bar

User · Answer

Using res json with Express   function random response      console log  response json sets the appropriate header and performs JSON stringify      response json        anObject    item1   item1val   item2   item2val          anArray    item1    item2         another   item            Alternatively   function random response      console log  Request handler random was called       response writeHead 200    Content-Type    application json       var otherArray     item1    item2      var otherObject     item1   item1val   item2   item2val       var json   JSON stringify        anObject  otherObject       anArray  otherArray       another   item          response end json

User · Answer

in express there may be application-scoped JSON formatters   after looking at express lib response js  I m using this routine   function writeJsonPToRes app  req  res  obj        var replacer   app get  json replacer        var spaces   app get  json spaces        res set  Content-Type    application json        var partOfResponse   JSON stringify obj  replacer  spaces           replace   u2028 g     u2028            replace   u2029 g     u2029        var callback   req query app get  jsonp callback name         if  callback            if  Array isArray callback   callback   callback 0           res set  Content-Type    text javascript            var cb   callback replace         w    g               partOfResponse    typeof     cb           function    amp  amp      cb         partOfResponse       n             res write partOfResponse

User · Answer

You have to use the JSON stringify   function included with the V8 engine that node uses   var objToJson            response write JSON stringify objToJson      Edit  As far as I know  IANA has officially registered a MIME type for JSON as application json in RFC4627   It is also is listed in the Internet Media Type list here

[javascript] Responding with a JSON object in Node.js (converting object/array to JSON string)

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