JSON.parse無法與Twitter Streaming API中的JSON一起使用

Question

我正在使用node.js來使用Twitter流式API。 一切正常，除了當我嘗試解析json時。 這是我嘗試解析的示例：

{
    "text": "NEWS Nº2559 (use google translator to read it): http://t.co/dF3ClUC",
    "in_reply_to_user_id": null,
    "in_reply_to_status_id": null,
    "favorited": false,
    "in_reply_to_status_id_str": null,
    "id_str": "93748566299918337",
    "in_reply_to_screen_name": null,
    "in_reply_to_user_id_str": null,
    "geo": null,
    "source": "web",
    "contributors": null,
    "retweeted": false,
    "retweet_count": 0,
    "entities": {
        "user_mentions": [],
        "hashtags": [],
        "urls": [
            {
                "display_url": "luxatenealibros.blogspot.com/2011/07/lux-at…",
                "indices": [
                    48,
                    67
                ],
                "expanded_url": "http://luxatenealibros.blogspot.com/2011/07/lux-atenea-news-n2559-cinderella-fables.html",
                "url": "http://t.co/dF3ClUC"
            }
        ]
    },
    "place": null,
    "coordinates": null,
    "user": {
        "favourites_count": 0,
        "profile_sidebar_fill_color": "efefef",
        "profile_image_url": "http://a0.twimg.com/profile_images/983835547/logo_LUX_ATENEA_WEBZINE_normal.JPG",
        "default_profile_image": false,
        "show_all_inline_media": false,
        "geo_enabled": false,
        "profile_background_tile": true,
        "screen_name": "LUXATENEAWEBZIN",
        "id_str": "112305851",
        "profile_link_color": "009999",
        "url": null,
        "description": "LUX ATENEA WEBZINE\u000d\u000aREVISTA CULTURAL GÓTICA ATIS&NYD\u000d\u000a",
        "follow_request_sent": null,
        "statuses_count": 3027,
        "verified": false,
        "profile_sidebar_border_color": "eeeeee",
        "time_zone": null,
        "contributors_enabled": false,
        "profile_use_background_image": true,
        "location": "",
        "is_translator": false,
        "lang": "es",
        "profile_background_image_url_https": "https://si0.twimg.com/images/themes/theme14/bg.gif",
        "profile_background_color": "131516",
        "protected": false,
        "listed_count": 2,
        "profile_background_image_url": "http://a1.twimg.com/images/themes/theme14/bg.gif",
        "friends_count": 3,
        "followers_count": 55,
        "name": "LUX ATENEA WEBZINE",
        "notifications": null,
        "created_at": "Mon Feb 08 00:53:45 +0000 2010",
        "id": 112305851,
        "default_profile": false,
        "following": null,
        "utc_offset": null,
        "profile_text_color": "333333",
        "profile_image_url_https": "https://si0.twimg.com/profile_images/983835547/logo_LUX_ATENEA_WEBZINE_normal.JPG"
    },
    "truncated": false,
    "id": 93748566299918340,
    "created_at": "Wed Jul 20 18:26:14 +0000 2011"
}

jsonlint.com告訴我，它是有效的json，但無法從node.js進行解析。 知道為什么嗎？

Answer 1

我注意到

"id_str": "93748566299918337",

和

"id":      93748566299918340,

似乎是同一數據的兩種不同表示形式，但是數字形式似乎失去了一些精度。

JSON數字解析器是否有可能檢測到精度損失，因為ID數字文字正好符合尾數和保釋標准？

JSON實際上並未為數字指定任何語義，也沒有指定有損數字解析器的方式，但是實現可能會針對無法代表的數字提供保釋。

例如，只有可以使用良好的bigint / bigdecimal表示形式（例如python的JSON解析器）的JSON解析器才能使用{ "foo": 1e500 }做一些合理的事情，而JavaScript JS解析器（使用其本機數字類型表示數字）則可能將該數字轉換為Infinity ，該數字不能通過JSON往返。

RFC 4627的第4節說

4解析器

...實現可能會限制數字范圍。

編輯：

我注意到的另一個線索是

"text": "NEWS Nº2559 ...",
               ^

包含非ASCII字符。 如果您使用的是Node.js，並且在打開文件時未指定正確的編碼，那么JSON解析器可能會采用UTF-8，因為RFC 4627表示

3編碼

JSON文本應以Unicode編碼。 默認編碼為UTF-8。

如果文件不是UTF-8，則可能會導致字節序列在UTF-8中無效，因此解碼器必須拒絕該字節序列。

Answer 2

我發現了問題，它來自user.description部分以及字符\\ u000d和\\ u000a。 這是我使它工作的方法：

var test = '{"text": "NEWS Nº2559 (use google translator to read it): http://t.co/dF3ClUC","in_reply_to_user_id": null,"in_reply_to_status_id": null,"favorited": false,"in_reply_to_status_id_str": null,"id_str": "93748566299918337","in_reply_to_screen_name": null,"in_reply_to_user_id_str": null,"geo": null,"source": "web","contributors": null,"retweeted": false,"retweet_count": 0,"entities": {"user_mentions": [],"hashtags": [],"urls": [{"display_url": "luxatenealibros.blogspot.com/2011/07/lux-at…","indices": [48,67],"expanded_url": "http://luxatenealibros.blogspot.com/2011/07/lux-atenea-news-n2559-cinderella-fables.html","url": "http://t.co/dF3ClUC"}]},"place": null,"coordinates": null,"user": {"favourites_count": 0,"profile_sidebar_fill_color": "efefef","profile_image_url": "http://a0.twimg.com/profile_images/983835547/logo_LUX_ATENEA_WEBZINE_normal.JPG","default_profile_image": false,"show_all_inline_media": false,"geo_enabled": false,"profile_background_tile": true,"screen_name": "LUXATENEAWEBZIN","id_str": "112305851","profile_link_color": "009999","url": null,"description": "LUX ATENEA WEBZINE\u000d\u000aREVISTA CULTURAL GÓTICA ATIS&NYD\u000d\u000a","follow_request_sent": null,"statuses_count": 3027,"verified": false,"profile_sidebar_border_color": "eeeeee","time_zone": null,"contributors_enabled": false,"profile_use_background_image": true,"location": "","is_translator": false,"lang": "es","profile_background_image_url_https": "https://si0.twimg.com/images/themes/theme14/bg.gif","profile_background_color": "131516","protected": false,"listed_count": 2,"profile_background_image_url": "http://a1.twimg.com/images/themes/theme14/bg.gif","friends_count": 3,"followers_count": 55,"name": "LUX ATENEA WEBZINE","notifications": null,"created_at": "Mon Feb 08 00:53:45 +0000 2010","id": 112305851,"default_profile": false,"following": null,"utc_offset": null,"profile_text_color": "333333","profile_image_url_https": "https://si0.twimg.com/profile_images/983835547/logo_LUX_ATENEA_WEBZINE_normal.JPG"},"truncated": false,"id": 93748566299918340,"created_at": "Wed Jul 20 18:26:14 +0000 2011"}';

test = test.replace(/\n/g, '');
test = test.replace(/\r/g, '');

console.log(JSON.parse(test));