javascript - Angular http$ response for text/plain file download fails with SyntaxError: Unexpected number in JSON -

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i have implemented download file feature on angular-based client , node.js backend based on following solution: https://stackoverflow.com/a/20904398/1503142. in general works, receive "syntaxerror: unexpected number in json @ position x" combined "typeerror: cannot read propery 'messages' of undefined".

a few observations:

  • everything appears working on node server-side, because response @ client. error in question reported client; no errors reported server.
  • the log file consists of time stamp, basic log information text. text contains ascii characters
  • using postman, response works every time, lends idea http$ code might having issue response. postman's response header information indicates response content-type->text/plain; charset=utf-8.
  • i using angularjs v1.2.21 , node v0.12.13

here's client-side code:

$http({     method: 'get',     url: "/api/logging/logfiles/" + logfile,     headers: { 'content-type': 'text/plain;charset=utf-8' } }). success(function (data, status, headers, config) {     var anchor = angular.element('<a/>');     anchor.attr({         href: 'data:text/plain;charset=utf-8,' + encodeuricomponent(data),         target: '_blank',         download: logfile     })[0].click(); }). error(function (data, status, headers, config) {     console.log('hence visit stackoverflow!') });

here's server-side code:

app.get('/api/logging/logfiles/:logfile', function (req, res, next) {   logdirectory = './log';   fs.readfile(logdirectory + "/" + req.params.logfile, 'utf8', function (err, data) {     if (err) {         res.send("something broke!");     }     else {         res.set({ 'content-type': 'text/plain; charset=utf-8' });         res.send(data);     }   }); });

i suspect related contents of log file. since i've specified text/plain content, why there json parsing error?

try : 

app.get('/api/logging/logfiles/:logfile', function (req, res, next) {   logdirectory = './log';   res.sendfile(logdirectory + "/" + req.params.logfile);  });

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