salix/loopback/common/methods/application/post.js

module.exports = Self => {
    Self.remoteMethodCtx('post', {
        description: 'Returns the sent parameters',
        returns: {
            type: 'object',
            root: true
        },
        http: {
            path: `/post`,
            verb: 'POST'
        }
    });

    Self.post = async ctx => {
        console.log(ctx.req.body);
        return ctx.req.body;
    };
};