You are looking at the HTML representation of the RAW 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 RAW format, set format=raw.
See the complete documentation, or API help for more information.
{
    "query": {
        "namespaces": {
            "-2": {
                "id": -2,
                "case": "first-letter",
                "*": "Media",
                "canonical": "Media"
            },
            "-1": {
                "id": -1,
                "case": "first-letter",
                "*": "Special",
                "canonical": "Special"
            },
            "0": {
                "id": 0,
                "case": "first-letter",
                "*": "",
                "content": ""
            },
            "1": {
                "id": 1,
                "case": "first-letter",
                "*": "Talk",
                "subpages": "",
                "canonical": "Talk"
            },
            "2": {
                "id": 2,
                "case": "first-letter",
                "*": "User",
                "subpages": "",
                "canonical": "User"
            },
            "3": {
                "id": 3,
                "case": "first-letter",
                "*": "User talk",
                "subpages": "",
                "canonical": "User talk"
            },
            "4": {
                "id": 4,
                "case": "first-letter",
                "*": "\u0412\u0441\u0435\u0443\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430 \u0430\u0441\u043e\u0446\u0456\u0430\u0446\u0456\u044f \u043c\u0443\u0437\u0435\u0457\u0432",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "\u0412\u0441\u0435\u0443\u043a\u0440\u0430\u0457\u043d\u0441\u044c\u043a\u0430 \u0430\u0441\u043e\u0446\u0456\u0430\u0446\u0456\u044f \u043c\u0443\u0437\u0435\u0457\u0432 talk",
                "subpages": "",
                "canonical": "Project talk"
            },
            "6": {
                "id": 6,
                "case": "first-letter",
                "*": "File",
                "canonical": "File"
            },
            "7": {
                "id": 7,
                "case": "first-letter",
                "*": "File talk",
                "subpages": "",
                "canonical": "File talk"
            },
            "8": {
                "id": 8,
                "case": "first-letter",
                "*": "MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki"
            },
            "9": {
                "id": 9,
                "case": "first-letter",
                "*": "MediaWiki talk",
                "subpages": "",
                "canonical": "MediaWiki talk"
            },
            "10": {
                "id": 10,
                "case": "first-letter",
                "*": "Template",
                "canonical": "Template"
            },
            "11": {
                "id": 11,
                "case": "first-letter",
                "*": "Template talk",
                "subpages": "",
                "canonical": "Template talk"
            },
            "12": {
                "id": 12,
                "case": "first-letter",
                "*": "Help",
                "subpages": "",
                "canonical": "Help"
            },
            "13": {
                "id": 13,
                "case": "first-letter",
                "*": "Help talk",
                "subpages": "",
                "canonical": "Help talk"
            },
            "14": {
                "id": 14,
                "case": "first-letter",
                "*": "Category",
                "canonical": "Category"
            },
            "15": {
                "id": 15,
                "case": "first-letter",
                "*": "Category talk",
                "subpages": "",
                "canonical": "Category talk"
            },
            "698": {
                "id": 698,
                "case": "first-letter",
                "*": "Platar",
                "canonical": "Platar"
            },
            "700": {
                "id": 700,
                "case": "first-letter",
                "*": "700",
                "canonical": "700"
            },
            "702": {
                "id": 702,
                "case": "first-letter",
                "*": "702",
                "canonical": "702"
            },
            "704": {
                "id": 704,
                "case": "first-letter",
                "*": "704",
                "canonical": "704"
            },
            "706": {
                "id": 706,
                "case": "first-letter",
                "*": "706",
                "canonical": "706"
            },
            "800": {
                "id": 800,
                "case": "first-letter",
                "*": "800",
                "canonical": "800"
            },
            "802": {
                "id": 802,
                "case": "first-letter",
                "*": "802",
                "canonical": "802"
            },
            "804": {
                "id": 804,
                "case": "first-letter",
                "*": "804",
                "canonical": "804"
            },
            "806": {
                "id": 806,
                "case": "first-letter",
                "*": "806",
                "canonical": "806"
            },
            "808": {
                "id": 808,
                "case": "first-letter",
                "*": "808",
                "canonical": "808"
            },
            "810": {
                "id": 810,
                "case": "first-letter",
                "*": "810",
                "canonical": "810"
            },
            "_element": "ns"
        }
    }
}