how to get md5checksum in search (google drtive api)

I'm using drive v3 of google drive api, and I want google files name, id, mimeType and md5Checksum.

    /** serarch files from google
     * @param query
     * @returns {Promise} with the result of the search
     * 
     */
    async search(query, token) {
        const config = {
            headers: {
                Authorization: `Bearer ${token}`,
            },
            params: {
                q: `name contains '${query}' and trashed=false and mimeType != 'application/vnd.google-apps.shortcut'  and mimeType != 'application/vnd.google-apps.folder'`,
                fields: '*',
                spaces: 'drive',
                pageSize: 13,
            },
        };

        if(query.length === 0 || !token) return [];
        const result = [];
        try {
            const response = await axios.get(
                `https://www.googleapis.com/drive/v3/files`,  
                config
            );       
            const files = await response.data.files;
            if (files.length) {
                files.map(file => {
                    let googleObject = {};
                    googleObject.id = file.id;
                    googleObject.name = file.name;
                    googleObject.icon = file.iconLink;
                    googleObject.mimeType = file.mimeType;
                    googleObject.md5Checksum = file.md5Checksum;
                    result.push(googleObject);
                });
            } else {
                result.push({
                    id: '',
                    name: 'No results',
                    icon: 'my-icon',
                    mimeType: '',
                });
            }
            return JSON.stringify(result);
        } catch (error) {
            console.log('error ', error);
            return null;
        }
    }

So i get a response from the server, something like this :

{
    "id": "****",
    "name": "test"

    "icon": "https://drive-thirdparty.googleusercontent.com/16/type/application/vnd.google-apps.spreadsheet",
    "mimeType": "application/vnd.google-apps.spreadsheet"
}

I can't figure out what I'm doing wrong, I try to replace fields: 'files(id,name,mimeType,iconLink,md5Checksum)', with fields: '',* but i still have the same error (only id, name, mimetype and icon)