Convert Mongoose docs to json

Question

I returned mongoose docs as json in this way   UserModel find     function  err  users        return res end JSON stringify users        However  user   proto   was also returned  How can I return without it  I tried this but not worked   UserModel find     function  err  users        return res end users toJSON           has no method  toJSON

User · Answer

Maybe a bit astray to the answer  but if anyone who is looking to do the other way around  you can use Model hydrate    since mongoose v4  to convert a javascript object  JSON  to a mongoose document   An useful case would be when you using Model aggregate        Because it is actually returning plain JS object  so you may want to convert it into a mongoose document in order to get access to Model method  e g  your virtual property defined in the schema    PS  I thought it should have a thread running like  Convert json to Mongoose docs   but actually not  and since I ve found out the answer  so I think it is not good to do self-post-and-self-answer

User · Answer

I found out I made a mistake  There s no need to call toObject   or toJSON   at all  The   proto   in the question came from jquery  not mongoose  Here s my test   UserModel find     function  err  users        console log users save            Function  numAsyncPres  0       var json   JSON stringify users       users   users map function  user            return user toObject              console log user save         undefined     console log json    JSON stringify users          true     doc toObject   removes doc prototype from a doc  But it makes no difference in JSON stringify doc   And it s not needed in this case

User · Answer

You may also try mongoosejs s lean      UserModel find   lean   exec function  err  users        return res end JSON stringify users

User · Answer

First of all  try toObject   instead of toJSON   maybe   Secondly  you ll need to call it on the actual documents and not the array  so maybe try something more annoying like this   var flatUsers   users map function       return user toObject       return res end JSON stringify flatUsers      It s a guess  but I hope it helps

User · Answer

It worked for me   Products find     then a   gt  console log a map p   gt  p toJSON         also if you want use getters  you should add its option also  on defining schema    new mongoose Schema         toJSON   getters  true

User · Answer

You can use res json   to jsonify any object  lean   will remove all the empty fields in the mongoose query   UserModel find   lean   exec function  err  users        return res json users

User · Answer

Late answer but you can also try this when defining your schema          toJSON implementation     schema options toJSON         transform  function doc  ret  options            ret id   ret  id          delete ret  id          delete ret   v          return ret             Note that ret is the JSON ed object  and it s not an instance of the mongoose model  You ll operate on it right on object hashes  without getters setters   And then   Model      findById modelId       exec function  dbErr  modelDoc            if dbErr  return handleErr dbErr             return res send modelDoc toJSON    200              Edit  Feb 2015  Because I didn t provide a solution to the missing toJSON  or toObject  method s  I will explain the difference between my usage example and OP s usage example   OP   UserModel      find        will get all users      exec function err  users               supposing that we don t have an error            and we had users in our collection             the users variable here is an array            of mongoose instances              wrong usage  from OP s example             return res end users toJSON        has no method toJSON             correct usage            to apply the toJSON transformation on instances  you have to            iterate through the users array          var transformedUsers   users map function user                return user toJSON                            finish the request         res end transformedUsers             My Example    UserModel      findById someId     will get a single user      exec function err  user               handle the error  if any         if err  return handleError err            if null     user                   user might be null if no user matched                the given id  someId                  the toJSON method is available here                 since the user variable here is a                 mongoose model instance             return res end user toJSON

User · Answer

Try this options     UserModel find     function  err  users          i got into errors using so i changed to res send       return res send  JSON parse JSON stringify users            Or       return JSON parse JSON stringify users

User · Answer

model find  Branch branch  function  err  docs     if  err  res send err     res send JSON parse JSON stringify docs

[json] Convert Mongoose docs to json

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