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",
                "*": "Counting Opinions",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "Counting Opinions 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"
            },
            "100": {
                "id": 100,
                "case": "first-letter",
                "*": "LibSat",
                "subpages": "",
                "canonical": "LibSat",
                "content": ""
            },
            "101": {
                "id": 101,
                "case": "first-letter",
                "*": "LibSat talk",
                "canonical": "LibSat talk"
            },
            "102": {
                "id": 102,
                "case": "first-letter",
                "*": "LibPAS",
                "subpages": "",
                "canonical": "LibPAS",
                "content": ""
            },
            "103": {
                "id": 103,
                "case": "first-letter",
                "*": "LibPAS talk",
                "canonical": "LibPAS talk"
            },
            "104": {
                "id": 104,
                "case": "first-letter",
                "*": "InformsUs",
                "subpages": "",
                "canonical": "InformsUs",
                "content": ""
            },
            "105": {
                "id": 105,
                "case": "first-letter",
                "*": "InformsUs talk",
                "canonical": "InformsUs talk"
            },
            "106": {
                "id": 106,
                "case": "first-letter",
                "*": "News",
                "subpages": "",
                "canonical": "News",
                "content": ""
            },
            "107": {
                "id": 107,
                "case": "first-letter",
                "*": "News talk",
                "canonical": "News talk"
            },
            "108": {
                "id": 108,
                "case": "first-letter",
                "*": "Staff",
                "subpages": "",
                "canonical": "Staff",
                "content": ""
            },
            "109": {
                "id": 109,
                "case": "first-letter",
                "*": "Staff talk",
                "canonical": "Staff talk"
            },
            "110": {
                "id": 110,
                "case": "first-letter",
                "*": "Services",
                "subpages": "",
                "canonical": "Services",
                "content": ""
            },
            "111": {
                "id": 111,
                "case": "first-letter",
                "*": "Services talk",
                "canonical": "Services talk"
            },
            "112": {
                "id": 112,
                "case": "first-letter",
                "*": "Studies",
                "subpages": "",
                "canonical": "Studies",
                "content": ""
            },
            "113": {
                "id": 113,
                "case": "first-letter",
                "*": "Studies talk",
                "canonical": "Studies talk"
            },
            "114": {
                "id": 114,
                "case": "first-letter",
                "*": "Support",
                "subpages": "",
                "canonical": "Support",
                "content": ""
            },
            "115": {
                "id": 115,
                "case": "first-letter",
                "*": "Support talk",
                "canonical": "Support talk"
            },
            "116": {
                "id": 116,
                "case": "first-letter",
                "*": "Minutes",
                "subpages": "",
                "canonical": "Minutes"
            },
            "117": {
                "id": 117,
                "case": "first-letter",
                "*": "Minutes talk",
                "canonical": "Minutes talk"
            },
            "118": {
                "id": 118,
                "case": "first-letter",
                "*": "CSS",
                "subpages": "",
                "canonical": "CSS",
                "content": ""
            },
            "119": {
                "id": 119,
                "case": "first-letter",
                "*": "CSS talk",
                "canonical": "CSS talk"
            },
            "200": {
                "id": 200,
                "case": "first-letter",
                "*": "IPEDS",
                "subpages": "",
                "canonical": "IPEDS",
                "content": ""
            },
            "201": {
                "id": 201,
                "case": "first-letter",
                "*": "IPEDS talk",
                "canonical": "IPEDS talk"
            },
            "274": {
                "id": 274,
                "case": "first-letter",
                "*": "Widget",
                "subpages": "",
                "canonical": "Widget",
                "content": ""
            },
            "275": {
                "id": 275,
                "case": "first-letter",
                "*": "Widget talk",
                "subpages": "",
                "canonical": "Widget talk"
            },
            "302": {
                "id": 302,
                "case": "first-letter",
                "*": "Property",
                "canonical": "Property"
            },
            "303": {
                "id": 303,
                "case": "first-letter",
                "*": "Property talk",
                "subpages": "",
                "canonical": "Property talk"
            },
            "306": {
                "id": 306,
                "case": "first-letter",
                "*": "Form",
                "canonical": "Form"
            },
            "307": {
                "id": 307,
                "case": "first-letter",
                "*": "Form talk",
                "subpages": "",
                "canonical": "Form talk"
            },
            "308": {
                "id": 308,
                "case": "first-letter",
                "*": "Concept",
                "canonical": "Concept"
            },
            "309": {
                "id": 309,
                "case": "first-letter",
                "*": "Concept talk",
                "canonical": "Concept talk"
            }
        }
    }
}