You are looking at the HTML representation of the JSON format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the JSON format, set format=json.
See the complete documentation, or API help for more information.
{
    "query": {
        "namespaces": {
            "-2": {
                "id": -2,
                "case": "first-letter",
                "*": "\u041c\u0435\u0434\u0456\u0430",
                "canonical": "Media"
            },
            "-1": {
                "id": -1,
                "case": "first-letter",
                "*": "\u0421\u043f\u0435\u0446\u0456\u0430\u043b\u044c\u043d\u0430",
                "canonical": "Special"
            },
            "0": {
                "id": 0,
                "case": "first-letter",
                "*": "",
                "content": ""
            },
            "1": {
                "id": 1,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f",
                "subpages": "",
                "canonical": "Talk"
            },
            "2": {
                "id": 2,
                "case": "first-letter",
                "*": "\u041a\u043e\u0440\u0438\u0441\u0442\u0443\u0432\u0430\u0447",
                "subpages": "",
                "canonical": "User"
            },
            "3": {
                "id": 3,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f \u043a\u043e\u0440\u0438\u0441\u0442\u0443\u0432\u0430\u0447\u0430",
                "subpages": "",
                "canonical": "User talk"
            },
            "4": {
                "id": 4,
                "case": "first-letter",
                "*": "\u0412\u0456\u043a\u0456 \u0426\u0414\u041f\u0423",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f \u0412\u0456\u043a\u0456 \u0426\u0414\u041f\u0423",
                "subpages": "",
                "canonical": "Project talk"
            },
            "6": {
                "id": 6,
                "case": "first-letter",
                "*": "\u0424\u0430\u0439\u043b",
                "canonical": "File"
            },
            "7": {
                "id": 7,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f \u0444\u0430\u0439\u043b\u0443",
                "subpages": "",
                "canonical": "File talk"
            },
            "8": {
                "id": 8,
                "case": "first-letter",
                "*": "MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki"
            },
            "9": {
                "id": 9,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki talk"
            },
            "10": {
                "id": 10,
                "case": "first-letter",
                "*": "\u0428\u0430\u0431\u043b\u043e\u043d",
                "canonical": "Template"
            },
            "11": {
                "id": 11,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f \u0448\u0430\u0431\u043b\u043e\u043d\u0443",
                "subpages": "",
                "canonical": "Template talk"
            },
            "12": {
                "id": 12,
                "case": "first-letter",
                "*": "\u0414\u043e\u0432\u0456\u0434\u043a\u0430",
                "subpages": "",
                "canonical": "Help"
            },
            "13": {
                "id": 13,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f \u0434\u043e\u0432\u0456\u0434\u043a\u0438",
                "subpages": "",
                "canonical": "Help talk"
            },
            "14": {
                "id": 14,
                "case": "first-letter",
                "*": "\u041a\u0430\u0442\u0435\u0433\u043e\u0440\u0456\u044f",
                "canonical": "Category"
            },
            "15": {
                "id": 15,
                "case": "first-letter",
                "*": "\u041e\u0431\u0433\u043e\u0432\u043e\u0440\u0435\u043d\u043d\u044f \u043a\u0430\u0442\u0435\u0433\u043e\u0440\u0456\u0457",
                "subpages": "",
                "canonical": "Category talk"
            }
        }
    }
}