如何使用client-oauth2作为json发送？

npm install client-oauth2

const ClientOAuth2 = require('client-oauth2');

const authClient = new ClientOAuth2({
  clientId: 'YOUR_CLIENT_ID',
  clientSecret: 'YOUR_CLIENT_SECRET',
  accessTokenUri: 'YOUR_ACCESS_TOKEN_URL',
  authorizationUri: 'YOUR_AUTHORIZATION_URL',
  redirectUri: 'YOUR_REDIRECT_URL',
});

const axios = require('axios');

const httpClient = axios.create({
  baseURL: 'YOUR_API_BASE_URL',
});

authClient.owner.getToken('YOUR_USERNAME', 'YOUR_PASSWORD')
  .then((user) => {
    const token = user.accessToken;

    httpClient.post('/your-api-endpoint', {
      key1: 'value1',
      key2: 'value2',
    }, {
      headers: {
        Authorization: `Bearer ${token}`,
        'Content-Type': 'application/json',
      },
    })
      .then((response) => {
        // 处理API响应
      })
      .catch((error) => {
        // 处理错误
      });
  })
  .catch((error) => {
    // 处理认证错误
  });