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",
                "*": "M\u00e9dia",
                "canonical": "Media"
            },
            "-1": {
                "id": -1,
                "case": "first-letter",
                "*": "Speci\u00e1ln\u00ed",
                "canonical": "Special"
            },
            "0": {
                "id": 0,
                "case": "first-letter",
                "*": "",
                "content": ""
            },
            "1": {
                "id": 1,
                "case": "first-letter",
                "*": "Diskuse",
                "subpages": "",
                "canonical": "Talk"
            },
            "2": {
                "id": 2,
                "case": "first-letter",
                "*": "U\u017eivatel",
                "subpages": "",
                "canonical": "User"
            },
            "3": {
                "id": 3,
                "case": "first-letter",
                "*": "Diskuse s u\u017eivatelem",
                "subpages": "",
                "canonical": "User talk"
            },
            "4": {
                "id": 4,
                "case": "first-letter",
                "*": "sumava-corpus",
                "subpages": "",
                "canonical": "Project"
            },
            "5": {
                "id": 5,
                "case": "first-letter",
                "*": "Diskuse k sumava-corpus",
                "subpages": "",
                "canonical": "Project talk"
            },
            "6": {
                "id": 6,
                "case": "first-letter",
                "*": "Soubor",
                "canonical": "File"
            },
            "7": {
                "id": 7,
                "case": "first-letter",
                "*": "Diskuse k souboru",
                "subpages": "",
                "canonical": "File talk"
            },
            "8": {
                "id": 8,
                "case": "first-letter",
                "*": "MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki"
            },
            "9": {
                "id": 9,
                "case": "first-letter",
                "*": "Diskuse k MediaWiki",
                "subpages": "",
                "canonical": "MediaWiki talk"
            },
            "10": {
                "id": 10,
                "case": "first-letter",
                "*": "\u0160ablona",
                "canonical": "Template"
            },
            "11": {
                "id": 11,
                "case": "first-letter",
                "*": "Diskuse k \u0161ablon\u011b",
                "subpages": "",
                "canonical": "Template talk"
            },
            "12": {
                "id": 12,
                "case": "first-letter",
                "*": "N\u00e1pov\u011bda",
                "subpages": "",
                "canonical": "Help"
            },
            "13": {
                "id": 13,
                "case": "first-letter",
                "*": "Diskuse k n\u00e1pov\u011bd\u011b",
                "subpages": "",
                "canonical": "Help talk"
            },
            "14": {
                "id": 14,
                "case": "first-letter",
                "*": "Kategorie",
                "canonical": "Category"
            },
            "15": {
                "id": 15,
                "case": "first-letter",
                "*": "Diskuse ke kategorii",
                "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"
            },
            "170": {
                "id": 170,
                "case": "first-letter",
                "*": "Filter",
                "canonical": "Filter"
            },
            "171": {
                "id": 171,
                "case": "first-letter",
                "*": "Filter talk",
                "subpages": "",
                "canonical": "Filter talk"
            },
            "420": {
                "id": 420,
                "case": "first-letter",
                "*": "Layer",
                "canonical": "Layer"
            },
            "421": {
                "id": 421,
                "case": "first-letter",
                "*": "Layer talk",
                "canonical": "Layer talk"
            }
        }
    }
}