我有一个问题连接到api通过axios错误：请求失败与状态码400

有人能帮帮我吗？

我的服务/api. js：'

const axios = require("axios");

const api = axios.create({
  baseURL: "https://url.com"
});

api.interceptors.request.use(async config => {
    config.headers.access_token = `token123`;  
    return config;
});

module.exports = api;

我的控制器：

 const api = require('services/api');
    router.post('/', async (req, res) => {    
       try {
         const response = await api.post("/api", JSON.stringify(data));
         return response;
        } catch (err) {          
          return res.status(400).send({ erro: err })
        }
    })

    module.exports = app => app.use('/routes', router)

但是当我提出请求的时候，我得到了错误

{
  "erro": {
    "message": "Request failed with status code 400",
    "name": "Error",
    "stack": "Error: Request failed with status code 400\n    at createError (/Library/WebServer/Documents/api/node_modules/axios/lib/core/createError.js:16:15)\n    at settle (/Library/WebServer/Documents/api/node_modules/axios/lib/core/settle.js:17:12)\n    at IncomingMessage.handleStreamEnd (/Library/WebServer/Documents/api-nex/node_modules/axios/lib/adapters/http.js:236:11)\n    at IncomingMessage.emit (events.js:228:7)\n    at endReadableNT (_stream_readable.js:1185:12)\n    at processTicksAndRejections (internal/process/task_queues.js:81:21)",
    "config": {
      "url": "/api",
      "method": "post",
      "data": "{"\myjson\": "\json\"}",
      "headers": {
        "Accept": "application/json, text/plain, */*",
        "Content-Type": "application/x-www-form-urlencoded",
        "access_token": "token123",
        "User-Agent": "axios/0.19.2",
        "Content-Length": 398
      },
      "baseURL": "https://url.com",
      "transformRequest": [
        null
      ],
      "transformResponse": [
        null
      ],
      "timeout": 0,
      "xsrfCookieName": "XSRF-TOKEN",
      "xsrfHeaderName": "X-XSRF-TOKEN",
      "maxContentLength": -1
    }
  }
}