javascript - NodeJS Async: Callback already called? -


i'm using async module in node.js keep track of asynchronous calls. however, i'm getting error - "callback called." can me out here? 

async.each(data['results'], function(result, done) {      if (result['twitter_id'] !== null) { //isolate twitter handle         var param = { "user.screen_name": result['twitter_id']}         db.test4.find( param, function(err, users) {             if( err ) {                 return done(err);             } else if (!users) {                 res.send("no user found");             } else {                 users.foreach( function(result) {                      twitter_ids.push(result);                     //console.log(result);                     done();                 });             }         });     } }, function(err) {       if (err) {         throw err     }     res.send(twitter_ids); });

you're calling res.send("no user found"); each time fail load. can fail load multiple times.

the solution put response code in final callback, not in each callback.

async.each(data['results'], function(result, done) {      if (result['twitter_id'] !== null) { //isolate twitter handle         var param = { "user.screen_name": result['twitter_id']}         db.test4.find( param, function(err, users) {             if( err ) {                 done(err);             } else if (!users) {                 done(new error("no user found"));             } else {                 users.foreach( function(result) {                      twitter_ids.push(result);                     //console.log(result);                 });                 done();             }         });     } else {       done();     } }, function(err) {       if (err) {         return next(err);     }     res.send(twitter_ids); });

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