Im getting this error and i dont know how to solve it. In a node js server, i'm using some .then() function on a promise and at the end i placed a .catch() function that for some reason is not recognized. I have seen in many places in tutorials that this is how an error is handled. I'm not using any external libraries.

The error :

 TypeError: promise.then(...).then(...).then(...).then(...).catch is not a function

This is my code:

exports.joinAlbum = function(req, res){ var promise = Album.findOne().where({'shortId': req.body.shortId}).exec(); // Returns a promise promise.then(function(albumDoc){ console.log('Then #1'); ..... } return albumDoc.save(); // Returns a promise }) .then(function(albumDoc){ console.log('Then #2'); ..... return User.findById(req.body.userId).exec(); // Returns a promise }) .then(function(userDoc){ console.log('Then #3'); ........ return userDoc.save(); // Returns a promise }) // Return a response .then(function(savedUserDoc){ console.log('Then #4'); return res.status(200).json({success: true}); }) //Error handler .catch(function(err){ console.log('Catch #1'); console.log(err); res.status(200).json({success: false}); }); }

If .catch() is not the correct way to handle promise error, what do you suggest? Im trying to avoid using external libraries and prefer using native javascript

EDIT: solution

I added a npm module called blue-bird that helped me solve this.

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1 Answer

It looks like you're using Mongoose, which returns its own Promise, not the ES6 promise which includes a catch function. A mongoose Promise has no catch function. You can overwrite the default Promise that Mongoose uses, fortunately:

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