Creating a JSON response using Django and Python

Question

I m trying to convert a server side Ajax response script into a Django HttpResponse  but apparently it s not working   This is the server-side script      RECEIVE VALUE     validateValue   POST  validateValue     validateId   POST  validateId     validateError   POST  validateError        RETURN VALUE     arrayToJs   array     arrayToJs 0     validateId   arrayToJs 1     validateError   if  validateValue    Testuser        Validate        arrayToJs 2     true            RETURN TRUE     echo    jsonValidateReturn    json encode  arrayToJs           RETURN ARRAY WITH success   else      for  x 0  x lt 1000000  x             if  x    990000                arrayToJs 2     false               echo    jsonValidateReturn    json encode  arrayToJs            RETURNS ARRAY WITH ERROR                      And this is the converted code  def validate user request       if request method     POST           vld value   request POST get  validateValue           vld id   request POST get  validateId           vld error   request POST get  validateError            array to js    vld id  vld error  False           if vld value     TestUser               array to js 2    True             x   simplejson dumps array to js              return HttpResponse x          else              array to js 2    False             x   simplejson dumps array to js              error    Error              return render to response  index html    error  error  context instance RequestContext request       return render to response  index html  context instance RequestContext request     I m using simplejson to encode the Python list  so it will return a JSON array   I couldn t figure out the problem yet  But I think that I did something wrong about the  echo

User · Answer

Use JsonResponse   from django http import JsonResponse

User · Answer

With Django Class-based views you can write   from django views import View from django http import JsonResponse  class JsonView View       def get self  request           return JsonResponse   some    data      and with Django-Rest-Framework you can write   from rest framework views import APIView from rest framework response import Response  class JsonView APIView       def get self  request           return Response   some    data

User · Answer

Django code views py      def view request       if request method     POST           print request body         data   request body         return HttpResponse json dumps data     HTML code view html    lt  DOCTYPE html gt   lt html gt   lt head gt   lt script src  http   ajax googleapis com ajax libs jquery 1 11 1 jquery min js  gt  lt  script gt   lt script gt    document  ready function            mySelect   change function            selected       mySelect option selected   text             ajax               type   POST               dataType   json               contentType   application json  charset utf-8               url    view                data                         fruit   selected                                  success  function result                            document write result                                           lt  script gt   lt  head gt   lt body gt    lt form gt        data        lt br gt  Select your favorite fruit   lt select id  mySelect  gt     lt option value  apple  selected  gt Select fruit lt  option gt     lt option value  apple  gt Apple lt  option gt     lt option value  orange  gt Orange lt  option gt     lt option value  pineapple  gt Pineapple lt  option gt     lt option value  banana  gt Banana lt  option gt   lt  select gt   lt  form gt   lt  body gt   lt  html gt

User · Answer

You ll want to use the django serializer to help with unicode stuff   from django core import serializers  json serializer   serializers get serializer  json         response    json serializer serialize list  ensure ascii False  indent 2  use natural keys True      return HttpResponse response  mimetype  application json

User · Answer

Most of these answers are out of date  JsonResponse is not recommended because it escapes the characters  which is usually undesired  Here s what I use  views py  returns HTML  from django shortcuts import render from django core import serializers  def your view request       data   serializers serialize  json   YourModel objects all        context     quot data quot  data      return render request   quot your view html quot   context   views py  returns JSON  from django core import serializers from django http import HttpResponse  def your view request       data   serializers serialize  json   YourModel objects all        return HttpResponse data  content type  application json    Bonus for Vue Users If you want to bring your Django Queryset into Vue  you can do the following  template html  lt div id  quot dataJson quot  style  quot display none quot  gt     data     lt  div gt    lt script gt  let dataParsed   JSON parse document getElementById  dataJson   textContent   var app   new Vue     el    app     data        yourVariable  dataParsed           lt  script gt

User · Answer

Its very convenient with Django version 1 7 or higher as you have the JsonResponse class  which is a subclass of HttpResponse   from django http import JsonResponse     def profile request           data                  name    Raghav                location    India                is active   False               count   28                   return JsonResponse data    For older versions of Django  you must use an HttpResponse object   import json from django http import HttpResponse  def profile request       data              name    Raghav            location    India            is active   False           count   28           dump   json dumps data      return HttpResponse dump  content type  application json

User · Answer

For those who use Django 1 7   from django http import JsonResponse  def your view request       json object     key    value       return JsonResponse json object    official docs

User · Answer

I use this  it works fine   from django utils import simplejson from django http import HttpResponse  def some view request       to json              key1    value1            key2    value2            return HttpResponse simplejson dumps to json   mimetype  application json     Alternative   from django utils import simplejson  class JsonResponse HttpResponse                   JSON response             def   init   self  content  mimetype  application json   status None  content type None           super JsonResponse  self    init                content simplejson dumps content               mimetype mimetype              status status              content type content type              In Django 1 7 JsonResponse objects have been added to the Django framework itself which makes this task even easier   from django http import JsonResponse def some view request       return JsonResponse   key    value

User · Answer

from django http import HttpResponse import json  class JsonResponse HttpResponse       def   init   self  content     mimetype None  status None               content type  application json            super JsonResponse  self    init   json dumps content   mimetype mimetype                                             status status  content type content type    And in the view   resp data     my key    my value    return JsonResponse resp data

User · Answer

I usually use a dictionary  not a list to return JSON content    import json  from django http import HttpResponse  response data      response data  result      error  response data  message      Some error message    Pre-Django 1 7 you d return it like this   return HttpResponse json dumps response data   content type  application json     For Django 1 7   use JsonResponse as shown in this SO answer like so     from django http import JsonResponse return JsonResponse   foo   bar

User · Answer

First import this   from django http import HttpResponse   If you have the JSON already   def your method request       your json      key1   value   key2   value       return HttpResponse your json   application json     If you get the JSON from another HTTP request   def your method request       response   request get  https   www example com get json       return HttpResponse response   application json

User · Answer

This is my preferred version using a class based view  Simply subclass the basic View and override the get  -method   import json  class MyJsonView View        def get self   args    kwargs           resp     my key    my value            return HttpResponse json dumps resp   mimetype  application json

User · Answer

Since Django 1 7 you have a standard JsonResponse that s exactly what you need   from django http import JsonResponse     return JsonResponse array to js  safe False    You don t even need to json dump your array

User · Answer

New in django 1 7  you could use JsonResponse objects    from the docs   from django http import JsonResponse return JsonResponse   foo   bar

User · Answer

In View use this    form field errors striptags   for getting validation messages without html

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How to use google app engine with ajax  json    Code Javascript with JQuery     ajax       url    ajax       dataType    json       cache  false      success  function data            alert  Load was performed   data ajax resp               Code Python  class Ajax webapp2 RequestHandler       def get self           my response     ajax resp   Hello  webapp World            datos   json dumps my response           self response headers add header  content-type    application json   charset  utf-8           self response out write datos

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