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",
                    "*": "Global wiki. Wargaming.net",
                    "subpages": "",
                    "canonical": "Project"
                },
                "5": {
                    "id": 5,
                    "case": "first-letter",
                    "*": "Global wiki. Wargaming.net 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"
                },
                "10000": {
                    "id": 10000,
                    "case": "first-letter",
                    "*": "Tank",
                    "canonical": "Tank",
                    "content": ""
                },
                "10001": {
                    "id": 10001,
                    "case": "first-letter",
                    "*": "Tank talk",
                    "canonical": "Tank talk"
                },
                "10002": {
                    "id": 10002,
                    "case": "first-letter",
                    "*": "Plane",
                    "canonical": "Plane",
                    "content": ""
                },
                "10003": {
                    "id": 10003,
                    "case": "first-letter",
                    "*": "Plane talk",
                    "canonical": "Plane talk"
                },
                "10004": {
                    "id": 10004,
                    "case": "first-letter",
                    "*": "Ship",
                    "canonical": "Ship",
                    "content": ""
                },
                "10005": {
                    "id": 10005,
                    "case": "first-letter",
                    "*": "Ship talk",
                    "canonical": "Ship talk"
                },
                "10006": {
                    "id": 10006,
                    "case": "first-letter",
                    "*": "Card",
                    "canonical": "Card",
                    "content": ""
                },
                "10007": {
                    "id": 10007,
                    "case": "first-letter",
                    "*": "Card talk",
                    "canonical": "Card talk"
                },
                "10008": {
                    "id": 10008,
                    "case": "first-letter",
                    "*": "Navy",
                    "canonical": "Navy",
                    "content": ""
                },
                "10009": {
                    "id": 10009,
                    "case": "first-letter",
                    "*": "Navy talk",
                    "canonical": "Navy talk"
                },
                "10010": {
                    "id": 10010,
                    "case": "first-letter",
                    "*": "Blitz",
                    "canonical": "Blitz",
                    "content": ""
                },
                "10011": {
                    "id": 10011,
                    "case": "first-letter",
                    "*": "Blitz talk",
                    "canonical": "Blitz talk"
                },
                "10012": {
                    "id": 10012,
                    "case": "first-letter",
                    "*": "XBOX",
                    "canonical": "XBOX",
                    "content": ""
                },
                "10013": {
                    "id": 10013,
                    "case": "first-letter",
                    "*": "XBOX talk",
                    "canonical": "XBOX talk"
                },
                "10014": {
                    "id": 10014,
                    "case": "first-letter",
                    "*": "TWA",
                    "canonical": "TWA",
                    "content": ""
                },
                "10015": {
                    "id": 10015,
                    "case": "first-letter",
                    "*": "TWA talk",
                    "canonical": "TWA talk"
                },
                "10016": {
                    "id": 10016,
                    "case": "first-letter",
                    "*": "Antiquity",
                    "canonical": "Antiquity",
                    "content": ""
                },
                "10017": {
                    "id": 10017,
                    "case": "first-letter",
                    "*": "Antiquity talk",
                    "canonical": "Antiquity talk"
                },
                "10018": {
                    "id": 10018,
                    "case": "first-letter",
                    "*": "Caliber",
                    "canonical": "Caliber",
                    "content": ""
                },
                "10019": {
                    "id": 10019,
                    "case": "first-letter",
                    "*": "Caliber talk",
                    "canonical": "Caliber talk"
                },
                "10020": {
                    "id": 10020,
                    "case": "first-letter",
                    "*": "SpecOps",
                    "canonical": "SpecOps",
                    "content": ""
                },
                "10021": {
                    "id": 10021,
                    "case": "first-letter",
                    "*": "SpecOps talk",
                    "canonical": "SpecOps talk"
                }
            }
        }
    }