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",
                "*": "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",
                "*": "Portal",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "Portal 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"
            },
            "102": {
                "id": 102,
                "case": "first-letter",
                "*": "Property",
                "canonical": "Property"
            },
            "103": {
                "id": 103,
                "case": "first-letter",
                "*": "Property talk",
                "subpages": "",
                "canonical": "Property talk"
            },
            "104": {
                "id": 104,
                "case": "first-letter",
                "*": "Type",
                "canonical": "Type"
            },
            "105": {
                "id": 105,
                "case": "first-letter",
                "*": "Type talk",
                "subpages": "",
                "canonical": "Type talk"
            },
            "106": {
                "id": 106,
                "case": "first-letter",
                "*": "Form",
                "canonical": "Form"
            },
            "107": {
                "id": 107,
                "case": "first-letter",
                "*": "Form talk",
                "subpages": "",
                "canonical": "Form talk"
            },
            "108": {
                "id": 108,
                "case": "first-letter",
                "*": "Concept",
                "canonical": "Concept"
            },
            "109": {
                "id": 109,
                "case": "first-letter",
                "*": "Concept talk",
                "subpages": "",
                "canonical": "Concept talk"
            },
            "180": {
                "id": 180,
                "case": "first-letter",
                "*": "XCSG",
                "subpages": "",
                "canonical": "XCSG"
            },
            "181": {
                "id": 181,
                "case": "first-letter",
                "*": "XCSG talk",
                "canonical": "XCSG talk"
            },
            "182": {
                "id": 182,
                "case": "first-letter",
                "*": "Java",
                "subpages": "",
                "canonical": "Java"
            },
            "183": {
                "id": 183,
                "case": "first-letter",
                "*": "Java talk",
                "canonical": "Java talk"
            },
            "184": {
                "id": 184,
                "case": "first-letter",
                "*": "C/C++",
                "subpages": "",
                "canonical": "C/C++"
            },
            "185": {
                "id": 185,
                "case": "first-letter",
                "*": "C/C++ talk",
                "canonical": "C/C++ talk"
            },
            "186": {
                "id": 186,
                "case": "first-letter",
                "*": "C",
                "subpages": "",
                "canonical": "C"
            },
            "187": {
                "id": 187,
                "case": "first-letter",
                "*": "C talk",
                "canonical": "C talk"
            }
        }
    }
}