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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.
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{
    "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",
                "*": "gsm",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "gsm 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",
                "*": "project01",
                "canonical": "project01"
            },
            "101": {
                "id": 101,
                "case": "first-letter",
                "*": "project01 talk",
                "canonical": "project01 talk"
            },
            "102": {
                "id": 102,
                "case": "first-letter",
                "*": "project02",
                "canonical": "project02"
            },
            "103": {
                "id": 103,
                "case": "first-letter",
                "*": "project02 talk",
                "canonical": "project02 talk"
            },
            "104": {
                "id": 104,
                "case": "first-letter",
                "*": "project03",
                "canonical": "project03"
            },
            "105": {
                "id": 105,
                "case": "first-letter",
                "*": "project03 talk",
                "canonical": "project03 talk"
            },
            "106": {
                "id": 106,
                "case": "first-letter",
                "*": "project04",
                "canonical": "project04"
            },
            "107": {
                "id": 107,
                "case": "first-letter",
                "*": "project04 talk",
                "canonical": "project04 talk"
            },
            "108": {
                "id": 108,
                "case": "first-letter",
                "*": "project05",
                "canonical": "project05"
            },
            "109": {
                "id": 109,
                "case": "first-letter",
                "*": "project05 talk",
                "canonical": "project05 talk"
            },
            "110": {
                "id": 110,
                "case": "first-letter",
                "*": "project06",
                "canonical": "project06"
            },
            "111": {
                "id": 111,
                "case": "first-letter",
                "*": "project06 talk",
                "canonical": "project06 talk"
            },
            "112": {
                "id": 112,
                "case": "first-letter",
                "*": "project07",
                "canonical": "project07"
            },
            "113": {
                "id": 113,
                "case": "first-letter",
                "*": "project07 talk",
                "canonical": "project07 talk"
            },
            "114": {
                "id": 114,
                "case": "first-letter",
                "*": "project08",
                "canonical": "project08"
            },
            "115": {
                "id": 115,
                "case": "first-letter",
                "*": "project08 talk",
                "canonical": "project08 talk"
            },
            "116": {
                "id": 116,
                "case": "first-letter",
                "*": "project09",
                "canonical": "project09"
            },
            "117": {
                "id": 117,
                "case": "first-letter",
                "*": "project09 talk",
                "canonical": "project09 talk"
            },
            "118": {
                "id": 118,
                "case": "first-letter",
                "*": "project10",
                "canonical": "project10"
            },
            "119": {
                "id": 119,
                "case": "first-letter",
                "*": "project10 talk",
                "canonical": "project10 talk"
            },
            "120": {
                "id": 120,
                "case": "first-letter",
                "*": "project11",
                "canonical": "project11"
            },
            "121": {
                "id": 121,
                "case": "first-letter",
                "*": "project11 talk",
                "canonical": "project11 talk"
            },
            "122": {
                "id": 122,
                "case": "first-letter",
                "*": "project12",
                "canonical": "project12"
            },
            "123": {
                "id": 123,
                "case": "first-letter",
                "*": "project12 talk",
                "canonical": "project12 talk"
            },
            "124": {
                "id": 124,
                "case": "first-letter",
                "*": "Msc2workshop1G1",
                "canonical": "Msc2workshop1G1"
            },
            "125": {
                "id": 125,
                "case": "first-letter",
                "*": "Msc2workshop1G1 talk",
                "canonical": "Msc2workshop1G1 talk"
            },
            "126": {
                "id": 126,
                "case": "first-letter",
                "*": "Msc2workshop1G2",
                "canonical": "Msc2workshop1G2"
            },
            "127": {
                "id": 127,
                "case": "first-letter",
                "*": "Msc2workshop1G2 talk",
                "canonical": "Msc2workshop1G2 talk"
            },
            "128": {
                "id": 128,
                "case": "first-letter",
                "*": "Msc2workshop1G3",
                "canonical": "Msc2workshop1G3"
            },
            "129": {
                "id": 129,
                "case": "first-letter",
                "*": "Msc2workshop1G3 talk",
                "canonical": "Msc2workshop1G3 talk"
            },
            "130": {
                "id": 130,
                "case": "first-letter",
                "*": "Msc2workshop1G4",
                "canonical": "Msc2workshop1G4"
            },
            "131": {
                "id": 131,
                "case": "first-letter",
                "*": "Msc2workshop1G4 talk",
                "canonical": "Msc2workshop1G4 talk"
            },
            "136": {
                "id": 136,
                "case": "first-letter",
                "*": "Msc2G1",
                "canonical": "Msc2G1"
            },
            "137": {
                "id": 137,
                "case": "first-letter",
                "*": "Msc2G1 talk",
                "canonical": "Msc2G1 talk"
            },
            "138": {
                "id": 138,
                "case": "first-letter",
                "*": "Msc2G2",
                "canonical": "Msc2G2"
            },
            "139": {
                "id": 139,
                "case": "first-letter",
                "*": "Msc2G2 talk",
                "canonical": "Msc2G2 talk"
            },
            "140": {
                "id": 140,
                "case": "first-letter",
                "*": "Msc2G3",
                "canonical": "Msc2G3"
            },
            "141": {
                "id": 141,
                "case": "first-letter",
                "*": "Msc2G3 talk",
                "canonical": "Msc2G3 talk"
            },
            "142": {
                "id": 142,
                "case": "first-letter",
                "*": "Msc2G4",
                "canonical": "Msc2G4"
            },
            "143": {
                "id": 143,
                "case": "first-letter",
                "*": "Msc2G4 talk",
                "canonical": "Msc2G4 talk"
            },
            "144": {
                "id": 144,
                "case": "first-letter",
                "*": "Msc2G5",
                "canonical": "Msc2G5"
            },
            "145": {
                "id": 145,
                "case": "first-letter",
                "*": "Msc2G5 talk",
                "canonical": "Msc2G5 talk"
            },
            "146": {
                "id": 146,
                "case": "first-letter",
                "*": "Msc2G6",
                "canonical": "Msc2G6"
            },
            "147": {
                "id": 147,
                "case": "first-letter",
                "*": "Msc2G6 talk",
                "canonical": "Msc2G6 talk"
            },
            "310": {
                "id": 310,
                "case": "first-letter",
                "*": "Shared",
                "canonical": "Shared"
            },
            "311": {
                "id": 311,
                "case": "first-letter",
                "*": "Shared talk",
                "canonical": "Shared talk"
            }
        }
    }
}