node.js - Not a string or buffer. Module Crypto -

i created on module util.js function myhash() reuse in different parts of code not working.

error message: this._binding.update(data, encoding); not string or buffer.

app.js

... global.util = require('./util'); global.dateformat = util.dateformat; global.myhash = util.myhash; /***** function *****/ ...  app.post('/test', function(req, res){     ...     var pass_shasum = myhash('test'); ... 

util.js

var crypto = require('crypto'); function myhash(msg) {     return crypto.createhash('sha256').update(msg).digest('hex'); }  exports.util = {     ...     myhash: myhash(),     ... }; 

any suggestions?

---

solution:

modify util.js

var crypto = require('crypto');  /* define var */ var myhash = function (msg) {     return crypto.createhash('sha256').update(msg).digest('hex'); };  module.exports = {     ...     myhash: myhash, /* variable not method. @robertklep */     ... }; 

you shouldn't execute function in exports statement (the msg argument undefined indeed not string or buffer):

exports.util = {     ...     myhash: myhash, // don't use myhash()     ... }; 

also, when export code this, have require this:

global.util = require('./util').util; 

(although suggest not using globals).

if don't want .util, export this:

module.exports = {   ...   myhash : myhash,   ... };