Why does express.js generate a JSON.parse error?

you parsing Object to Object?

JSON.parse() expects string:

var str = '{"test": "info"}';
obj = JSON.parse(str);

Basically JSON.parse() expects string but you were passing object, so instead do this:

var original = { test: 'info'};
var str = JSON.stringify(original);
var restored = JSON.parse(str);

Here's helpful docs about JSON https://developer.mozilla.org/en/Using_native_JSON

str is not a string, but an object. Put the whole thing into a string first, i.e.:

var str = '{ "test": "info"}';
obj = JSON.parse(str);

If you want to create JSON you need to use JSON.stringify.

var thing = { test: 'info' };
var json = JSON.stringify(thing);

If you want to parse JSON to an object you need to use parse. Parse expects you to use valid JSON.

var json = '{ "test": "info" }'; //Use double quotes for JSON
var thing = JSON.parse(json);

An easy way to test if you are using valid json is to use something like: http://jsonlint.com/