node.js - Node appendFile not appending data chunk to file on filesystem -

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i have program trying values request using curl , store them in file , serve stored content back. decision store or append contents in file based on query parameter appendflag when run program getting in console "true" , "appending" suggests indeed reads flag goes if part somehow appendfile function not working.

var http = require('http'); var url = require('url'); var querystring = require('querystring'); var fs = require('fs'); http.createserver(function(request,response){     var str = request.url.split('?')[1];     var query = querystring.parse(str);     var writestream = fs.createwritestream(query['filename']);     console.log("query - ");     console.log(query["appendflag"]);     request.on('data',function(chunk){         if(query["appendflag"]=="true"){             console.log("appending");             fs.appendfile(query['filename'],chunk.tostring(),function(err){                 if(err) throw err;             });         }else{             var buffergood = writestream.write(chunk);             if(!buffergood) request.pause();         }     });     request.on('end',function(){         response.writehead(200);         response.write("\n content url - \n");         var readstream = fs.createreadstream(query['filename'],{buffersize:64*1024});         readstream.on('data',function(chunk){             response.write(chunk.tostring());         });          readstream.on('end',function(){             response.write("\n");             response.end();         });     });     writestream.on('drain',function(){         request.resume();     }); }).listen(8080);

then after reading answer so( how create appending writestream in node.js ) tried - 

// program extract url request , writing in particular file  var http = require('http'); var url = require('url'); var querystring = require('querystring'); var fs = require('fs'); http.createserver(function(request,response){     var str = request.url.split('?')[1];     var query = querystring.parse(str);     var writestream = fs.createwritestream(query['filename']);     options = {          'flags': 'a' ,         'encoding' : null,         'mode' : 0666     }     var appendstream = fs.createwritestream(query['filename'],[options]);     console.log("query - ");     console.log(query["appendflag"]);     request.on('data',function(chunk){         if(query["appendflag"]=="true"){             console.log("appending");             var buffergood = appendstream.write(chunk.tostring());             if(!buffergood) request.pause();         }else{             var buffergood = writestream.write(chunk.tostring());             if(!buffergood) request.pause();         }     });     request.on('end',function(){         response.writehead(200);         response.write("\n content url - \n");         var readstream = fs.createreadstream(query['filename'],{buffersize:64*1024});         readstream.on('data',function(chunk){             response.write(chunk.tostring());         });          readstream.on('end',function(){             response.write("\n");             response.end();         });     });     writestream.on('drain',function(){         request.resume();     }); }).listen(8080);

that changed flag 'a' , did not append data?

your can use first variant. before appendfile() you've opened writestream same query["filename"]. stream opened. 

var writestream = fs.createwritestream(query['filename']); options = {      'flags': 'a' ,     'encoding' : null,     'mode' : 0666 } var appendstream = fs.createwritestream(query['filename'],[options]);

may it's better like:

var options = {   flags: query.appendfile ? 'w' : 'a'   ...

next: why [options]? should remove brackets.

next: there no guarantee you'll have filename param in querystring. please handle situation.


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