How do I use axios within ExpressJS?

user_1136089 0
Viewed 50353

I want to be able to use my React app to make a GET request to my server, which is suppose to prompt my server to make an GET request to an external API. I'm using axios and tried using request but both are giving me ERRTIMEOUT. The request are definitely working as I've tried on my frontend application and the requests work 

const express = require("express");
const axios = require("axios");
const router = express.Router();

router.get("/test", (req, res, next) => {
    console.log("'/test' call");
    axios.get("https://api.neoscan.io/api/main_net/v1/get_all_nodes")
       .then(data => res.json(data))
       .catch(err => res.secn(err));
})

module.exports = router;`

The error code

GGWP! { Error: connect ETIMEDOUT 104.25.167.105:443
    at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1113:14)
  errno: 'ETIMEDOUT',
  code: 'ETIMEDOUT',
  syscall: 'connect',
  address: '104.25.167.105',
  port: 443,
  config:
   { adapter: [Function: httpAdapter],
     transformRequest: { '0': [Function: transformRequest] },
     transformResponse: { '0': [Function: transformResponse] },
     timeout: 0,
     xsrfCookieName: 'XSRF-TOKEN',
     xsrfHeaderName: 'X-XSRF-TOKEN',
     maxContentLength: -1,
     validateStatus: [Function: validateStatus],
     headers:
      { Accept: 'application/json, text/plain, */*',
        'User-Agent': 'axios/0.18.0' },
     method: 'get',
     url: 'https://api.neoscan.io/api/main_net/v1/get_all_nodes',
     data: undefined },
  request:
   Writable {
     _writableState:
      WritableState {
        objectMode: false,
        highWaterMark: 16384,
        finalCalled: false,
        needDrain: false,
        ending: false,
        ended: false,
        finished: false,
        destroyed: false,
        decodeStrings: true,
        defaultEncoding: 'utf8',
        length: 0,
        writing: false,
        corked: 0,
        sync: true,
        bufferProcessing: false,
        onwrite: [Function: bound onwrite],
        writecb: null,
        writelen: 0,
        bufferedRequest: null,
        lastBufferedRequest: null,
        pendingcb: 0,
        prefinished: false,
        errorEmitted: false,
        emitClose: true,
        bufferedRequestCount: 0,
        corkedRequestsFree: [Object] },
     writable: true,
     _events:
      { response: [Function: handleResponse],
        error: [Function: handleRequestError] },
     _eventsCount: 2,
     _maxListeners: undefined,
     _options:
      { protocol: 'https:',
        maxRedirects: 21,
        maxBodyLength: 10485760,
        path: '/api/main_net/v1/get_all_nodes',
        method: 'get',
        headers: [Object],
        agent: undefined,
        auth: undefined,
        hostname: 'api.neoscan.io',
        port: null,
        nativeProtocols: [Object],
        pathname: '/api/main_net/v1/get_all_nodes' },
     _redirectCount: 0,
     _redirects: [],
     _requestBodyLength: 0,
     _requestBodyBuffers: [],
     _onNativeResponse: [Function],
     _currentRequest:
      ClientRequest {
        _events: [Object],
        _eventsCount: 6,
        _maxListeners: undefined,
        output: [],
        outputEncodings: [],
        outputCallbacks: [],
        outputSize: 0,
        writable: true,
        _last: true,
        chunkedEncoding: false,
        shouldKeepAlive: false,
        useChunkedEncodingByDefault: false,
        sendDate: false,
        _removedConnection: false,
        _removedContLen: false,
        _removedTE: false,
        _contentLength: 0,
        _hasBody: true,
        _trailer: '',
        finished: true,
        _headerSent: true,
        socket: [TLSSocket],
        connection: [TLSSocket],
        _header:
         'GET /api/main_net/v1/get_all_nodes HTTP/1.1\r\nAccept: application/json, text/plain, */*\r\nUser-Agent: axios/0.18.0\r\nHost: api.neoscan.io\r\nConnection: close\r\n\r\n',
        _onPendingData: [Function: noopPendingOutput],
        agent: [Agent],
        socketPath: undefined,
        timeout: undefined,
        method: 'GET',
        path: '/api/main_net/v1/get_all_nodes',
        _ended: false,
        res: null,
        aborted: undefined,
        timeoutCb: null,
        upgradeOrConnect: false,
        parser: null,
        maxHeadersCount: null,
        _redirectable: [Circular],
        [Symbol(isCorked)]: false,
        [Symbol(outHeadersKey)]: [Object] },
     _currentUrl: 'https://api.neoscan.io/api/main_net/v1/get_all_nodes' },
  response: undefined }

Here's the additional error code that I'm getting after responding

(node:35220) UnhandledPromiseRejectionWarning: TypeError: Converting circular structure to JSON
    at JSON.stringify (<anonymous>)
    at stringify (.\new-viewer\node_modules\express\lib\response.js:1119:12)
    at ServerResponse.json (.\new-viewer\node_modules\express\lib\response.js:260:14)
    at ServerResponse.send (.\new-viewer\node_modules\express\lib\response.js:158:21)
    at axios.get.then.catch.err (.\new-viewer\server\api\index.js:45:27)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:40496) UnhandledPromiseRejectionWarning: TypeError: res.error is not a function
    at axios.get.then.catch.err (.r\server\api\index.js:36:17)
    at process._tickCallback (internal/process/next_tick.js:68:7)
(node:40496) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). (rejection id: 2)
(node:40496) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
axios express node.js
5 Answers

Axios returns you the whole response, so if you try to send this you get a circular dependecy error. So on .then(data => res.json(data)), data is actually the response.

Try .then(response => res.json(response.data))

user_99949830

  1. You don't have to enclose your axios call in a try...catch as axios already has a catch block.

  2. Your express handler has to send a response back when axios gets a response from the API call or axios catches an error during the API call.

Your code should look something like this

router.get("/test", (req, res, next) => {
  console.log("'/test' call");
  axios.get("https://api.neoscan.io/api/main_net/v1/get_all_nodes")
    .then(data => res.json(data))
    .catch(err => next(err));
})

If you fancy async...await, you can write your code like this

router.get("/test", async (req, res, next) => {
  console.log("'/test' call");
  try {
    const res = await axios.get("https://api.neoscan.io/api/main_net/v1/get_all_nodes");
    res.json(data);
  }
  catch (err) {
    next(err)
  }
})
user_36267960

You forgot to respond to the client:

 try{
    axios.get("https://api.neoscan.io/api/main_net/v1/get_all_nodes")
           .then(data => res.status(200).send(data))
           .catch(err => res.send(err));
 }
 catch(err){
    console.error("GG", err);
 }
user_32601370 
            Modifying the previous answer ,
            try using response.data , then send it back to handler will solve the issue 
            try the snippet below
            const express = require('express');
            const axios=require("axios");
            const { response } = require('express')
            const router = express.Router();

            router.get("/",async (req, res, next) => {
            
            try {
                const response = await axios.get("https://api.neoscan.io/api/main_net/v1/get_all_nodes");
                console.log(response.data);
                res.send(response.data);
            }
            catch (err) {
                next(err)
            }
            })


            module.exports=router;
user_32484200 
const express = require('express')
const axios = require('axios')
const app = express()

app.get("/", async (req, res) => {
    try {
        const response = await axios.get("https://jsonplaceholder.typicode.com/posts")
        res.json(response.data)
    }
    catch (err) {
        console.log(err)
    }
})

app.get('*', (req, res) => {
    res.status(500).json({ message: "error" })
})

app.listen(3001)
user_151426130
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