scala - Return ReactiveMongo JSON in Play Framework -

what fastest way return json text bsonarray?

i'm returning big json document. possible omit processing play jsvalue

now i'm returning this:

 val result:bsonarray = ....  ok(json.tojson(result)) 

i think faster like:

 ok(result.totextjson).as(mimetypes.json) 

update here full code:

val command = json.parse( s""" {   "aggregate": "$collection",   "pipeline": [   { "$$match": { "$$and" : [       { "${rootattrs.time}" : { "$$gt": $startsectime }},       { "${rootattrs.time}" : { "$$lt": $endsectime }},       { "${rootattrs.command}" : { "$$eq": ${tocmd(command.gps_coordinates)} }}     ]   }},   { "$$sort": { "${rootattrs.time}" : 1 }},   { "$$limit": $max_gps_all_data },   { "$$project" : { "_id":0, "${rootattrs.time}":1, "${rootattrs.command}":1, "${rootattrs.value}":1, "${rootattrs.ignition}":1, "${rootattrs.sim_number}":1 } } ]}""")  db.command(rawcommand(bsondocumentformat.reads(command).get)).map { out =>   out.get("result").map {     case result: bsonarray =>       logger.debug("loaded gps history data size: " + result.length)       ok(json.tojson(result)) // <- need return json, parsing jsvalue can take time      case _ =>       logger.error("result gps history data not array")       badrequest    }.getorelse(badrequest) } 

you can bypass step of creating intermediary jsvalue if want create own writeable, , output string more manually.

here simple example can customised need

val result: bsonarray = bsonarray("one", "two", "three")  def convertbsonarraytostring(jsval: bsonarray): array[byte] = {   // method assumes have bsonarray of strings (which may not)   var strs: stream[string] = jsval.stream.map(_.get match { case s: bsonstring => s.value })   var json: string = strs.mkstring("[\"", "\",\"", "\"]")   json.getbytes() }  implicit def writeableof_bsonarray: writeable[bsonarray] = {   writeable(convertbsonarraytostring ,some("application/json")) }  def dostuff = action {   results.ok(result) } 

the response above ["one","two","three"]

if dealing massive data - may better off using enumerator, , streaming response.

see: https://www.playframework.com/documentation/2.5.x/scalastream