JSON me: Official solution fails

[JohnnyBizzel]

             ACTUAL                                 EXPECTED                

────────────────────────────────────────────────────────────────────────────────

"[" != "[{\"title\":\"Express.js Guide\",\"tags\":[\"node.js\",\"express.js\"],\"url\":\"http://expressjsguide.com\"},{\"title\":\"Rapid Prototyping with JS\",\"tags\":[\"backbone.js\",\"node.js\",\"mongodb\"],\"url\":\"http://rpjs.co\"},{\"title\":\"JavaScript: The Good Parts\",\"tags\":[\"javascript\"]}]" " \"title\": \"Express.js Guide\"," !=
" \"tags\": [" !=
" \"node.js\"," !=
" \"express.js\"" !=
" ]," !=
" \"url\": \"http://expressjsguide.com\"" !=
" }," !=
" {" !=
" \"title\": \"Rapid Prototyping with JS\"," !=
" \"tags\": [" !=
" \"backbone.js\"," !=
" \"node.js\"," !=
" \"mongodb\"" !=
" ]," !=
" \"url\": \"http://rpjs.co\"" !=
" }," !=
" {" !=
" \"title\": \"JavaScript: The Good Parts\"," !=
" \"tags\": [" !=
" \"javascript\"" !=
" ]" !=
" }" !=
"]" !=

[Ethicmeta]

For those interested, the work around is to change the res.json(obj) to res.end(JSON.stringify(obj));

the result is a string without the formatting which causes the test case to fail.