Connect-mongo Syntax Error: unexpected token =>

Question

Hi I have the following error

node_modules/connect-mongo/src/index.js:29
unserialize: options.unserialize || (x => x),
^^

I have these versions:

node@v3.3.1

express@4.14.0

mongoose@4.6.5

mongodb@2.2.11

score 2 · Accepted Answer · answered Oct 31 '16 at 07:45

2

Most probably you have an outdated version of Node.js.

The (x => x) is equivalent with function (x) { return x; } (it's called an arrow function).

Update Node.js to a version greater than 4.0.0.

Running the node process with the --harmony flag could solve the issue, but still updating the Node.js to a recent version is much better.

answered Oct 31 '16 at 07:45

Ionică Bizău

I did this but no difference: `sudo npm cache clean -f sudo npm install -g n sudo n stable` – Alireza Ghaffari Oct 31 '16 at 08:04
What does `node --version` output? – Ionică Bizău Oct 31 '16 at 08:09
Output: └─── n@2.1.4 – Alireza Ghaffari Oct 31 '16 at 08:12
Hmm, just run `node --version`. It should output something like `v....` – Ionică Bizău Oct 31 '16 at 08:20
Yes, just download a recent version from [the Node.js website](https://nodejs.org/en/)––probably the LTS one. – Ionică Bizău Oct 31 '16 at 09:00

1 Answers1