You are looking at the HTML representation of the RAW 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 RAW format, set format=raw.
See the complete documentation, or API help for more information.
{
    "query": {
        "namespaces": {
            "-2": {
                "id": -2,
                "case": "first-letter",
                "*": "M\u00e9dia",
                "canonical": "Media"
            },
            "-1": {
                "id": -1,
                "case": "first-letter",
                "*": "Sp\u00e9cial",
                "canonical": "Special"
            },
            "0": {
                "id": 0,
                "case": "first-letter",
                "*": "",
                "subpages": "",
                "content": ""
            },
            "1": {
                "id": 1,
                "case": "first-letter",
                "*": "Discussion",
                "subpages": "",
                "canonical": "Talk"
            },
            "2": {
                "id": 2,
                "case": "first-letter",
                "*": "Utilisateur",
                "subpages": "",
                "canonical": "User"
            },
            "3": {
                "id": 3,
                "case": "first-letter",
                "*": "Discussion utilisateur",
                "subpages": "",
                "canonical": "User talk"
            },
            "4": {
                "id": 4,
                "case": "first-letter",
                "*": "Gdn",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "Discussion Gdn",
                "subpages": "",
                "canonical": "Project talk"
            },
            "6": {
                "id": 6,
                "case": "first-letter",
                "*": "Fichier",
                "canonical": "File"
            },
            "7": {
                "id": 7,
                "case": "first-letter",
                "*": "Discussion fichier",
                "subpages": "",
                "canonical": "File talk"
            },
            "8": {
                "id": 8,
                "case": "first-letter",
                "*": "MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki"
            },
            "9": {
                "id": 9,
                "case": "first-letter",
                "*": "Discussion MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki talk"
            },
            "10": {
                "id": 10,
                "case": "first-letter",
                "*": "Mod\u00e8le",
                "subpages": "",
                "canonical": "Template"
            },
            "11": {
                "id": 11,
                "case": "first-letter",
                "*": "Discussion mod\u00e8le",
                "subpages": "",
                "canonical": "Template talk"
            },
            "12": {
                "id": 12,
                "case": "first-letter",
                "*": "Aide",
                "subpages": "",
                "canonical": "Help"
            },
            "13": {
                "id": 13,
                "case": "first-letter",
                "*": "Discussion aide",
                "subpages": "",
                "canonical": "Help talk"
            },
            "14": {
                "id": 14,
                "case": "first-letter",
                "*": "Cat\u00e9gorie",
                "canonical": "Category"
            },
            "15": {
                "id": 15,
                "case": "first-letter",
                "*": "Discussion cat\u00e9gorie",
                "subpages": "",
                "canonical": "Category talk"
            },
            "100": {
                "id": 100,
                "case": "first-letter",
                "*": "Portail",
                "subpages": "",
                "canonical": "Portail"
            },
            "101": {
                "id": 101,
                "case": "first-letter",
                "*": "Discussion Portail",
                "subpages": "",
                "canonical": "Discussion Portail"
            },
            "102": {
                "id": 102,
                "case": "first-letter",
                "*": "Transwiki",
                "subpages": "",
                "canonical": "Transwiki"
            },
            "103": {
                "id": 103,
                "case": "first-letter",
                "*": "Discussion Transwiki",
                "subpages": "",
                "canonical": "Discussion Transwiki"
            },
            "104": {
                "id": 104,
                "case": "first-letter",
                "*": "Dossier",
                "subpages": "",
                "canonical": "Dossier"
            },
            "105": {
                "id": 105,
                "case": "first-letter",
                "*": "Discussion Dossier",
                "subpages": "",
                "canonical": "Discussion Dossier"
            },
            "106": {
                "id": 106,
                "case": "first-letter",
                "*": "Grec",
                "subpages": "",
                "canonical": "Grec"
            },
            "107": {
                "id": 107,
                "case": "first-letter",
                "*": "Discussion Grec",
                "subpages": "",
                "canonical": "Discussion Grec"
            },
            "108": {
                "id": 108,
                "case": "first-letter",
                "*": "Annexe",
                "subpages": "",
                "canonical": "Annexe"
            },
            "109": {
                "id": 109,
                "case": "first-letter",
                "*": "Discussion Annexe",
                "subpages": "",
                "canonical": "Discussion Annexe"
            },
            "110": {
                "id": 110,
                "case": "first-letter",
                "*": "Page",
                "canonical": "Page"
            },
            "111": {
                "id": 111,
                "case": "first-letter",
                "*": "Discussion Page",
                "canonical": "Discussion Page"
            },
            "112": {
                "id": 112,
                "case": "first-letter",
                "*": "Index",
                "canonical": "Index"
            },
            "113": {
                "id": 113,
                "case": "first-letter",
                "*": "Discussion Index",
                "canonical": "Discussion Index"
            },
            "114": {
                "id": 114,
                "case": "first-letter",
                "*": "Catalan",
                "canonical": "Catalan"
            },
            "115": {
                "id": 115,
                "case": "first-letter",
                "*": "Discussion Catalan",
                "canonical": "Discussion Catalan"
            },
            "_element": "ns"
        }
    }
}