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",
                "*": "\u30e1\u30c7\u30a3\u30a2",
                "canonical": "Media"
            },
            "-1": {
                "id": -1,
                "case": "first-letter",
                "*": "\u7279\u5225",
                "canonical": "Special"
            },
            "0": {
                "id": 0,
                "case": "first-letter",
                "*": "",
                "content": ""
            },
            "1": {
                "id": 1,
                "case": "first-letter",
                "*": "\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "Talk"
            },
            "2": {
                "id": 2,
                "case": "first-letter",
                "*": "\u5229\u7528\u8005",
                "subpages": "",
                "canonical": "User"
            },
            "3": {
                "id": 3,
                "case": "first-letter",
                "*": "\u5229\u7528\u8005\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "User talk"
            },
            "4": {
                "id": 4,
                "case": "first-letter",
                "*": "\u8e0a\u308b\u5927\u635c\u67fb\u7ddaWiki",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "\u8e0a\u308b\u5927\u635c\u67fb\u7ddaWiki\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "Project talk"
            },
            "6": {
                "id": 6,
                "case": "first-letter",
                "*": "\u30d5\u30a1\u30a4\u30eb",
                "canonical": "File"
            },
            "7": {
                "id": 7,
                "case": "first-letter",
                "*": "\u30d5\u30a1\u30a4\u30eb\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "File talk"
            },
            "8": {
                "id": 8,
                "case": "first-letter",
                "*": "MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki"
            },
            "9": {
                "id": 9,
                "case": "first-letter",
                "*": "MediaWiki\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "MediaWiki talk"
            },
            "10": {
                "id": 10,
                "case": "first-letter",
                "*": "\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8",
                "canonical": "Template"
            },
            "11": {
                "id": 11,
                "case": "first-letter",
                "*": "\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "Template talk"
            },
            "12": {
                "id": 12,
                "case": "first-letter",
                "*": "\u30d8\u30eb\u30d7",
                "subpages": "",
                "canonical": "Help"
            },
            "13": {
                "id": 13,
                "case": "first-letter",
                "*": "\u30d8\u30eb\u30d7\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "Help talk"
            },
            "14": {
                "id": 14,
                "case": "first-letter",
                "*": "\u30ab\u30c6\u30b4\u30ea",
                "canonical": "Category"
            },
            "15": {
                "id": 15,
                "case": "first-letter",
                "*": "\u30ab\u30c6\u30b4\u30ea\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "Category talk"
            },
            "828": {
                "id": 828,
                "case": "first-letter",
                "*": "\u30e2\u30b8\u30e5\u30fc\u30eb",
                "subpages": "",
                "canonical": "Module"
            },
            "829": {
                "id": 829,
                "case": "first-letter",
                "*": "\u30e2\u30b8\u30e5\u30fc\u30eb\u30fb\u30c8\u30fc\u30af",
                "subpages": "",
                "canonical": "Module talk"
            }
        }
    }
}