问向graphql api发送http请求时出现“解析JSON问题”

EN

app.get('/fetch-data', function(req, res, next) {
    const access_token = settings.dev.TOKEN;
    const query = {query: { viewer: { 'login': 'muckbuck' } }};

    const options = {
        uri: 'https://api.github.com/graphql',
        method: 'POST',
        headers: {
            'Accept': 'application/json',
            'Authorization': "Bearer " + access_token,
            'User-Agent': 'request',
            'contentType': "application/graphql",
        },
        data: query
    };

    function callback(error, response, body) {
        console.log(response.body)
        if (!error && response.statusCode == 200) {
            console.log(body);
            console.log('lol');
        }
    }
    request(options, callback);



});

{"message":"Problems parsing JSON","documentation_url":"https://developer.github.com/v3"}