Runtime Framework#

Modern.js BFF supports different runtime frameworks. Currently, Modern.js BFF supports two runtime frameworks: Express.js and Koa.js.

When using different runtime frameworks, some APIs may differ.

Accessing Request Context#

In BFF functions, you may need to access the request context to handle more logic. Depending on the runtime framework, you need to use different APIs:

import { useContext } from '@modern-js/runtime/express'
export const get = async () => {
  const { req } = useContext();
  console.info(`access url: ${req.url}`);
  return 'Hello Modern.js'
};

Using Middleware#

In BFF functions, you may need to use middleware to handle more logic. Depending on the runtime framework, you need to use different APIs:

import { hook } from '@modern-js/runtime/express';

export default hook(({ addMiddleware }) => {
  addMiddleware((req, res, next) => {
    req.query.id = 'koa';
    next();
  });
});