Не уверен, почему res.send не отправляет мой объект во внешний интерфейс

import React from 'react';
import axios from 'axios';

class SearchBar extends React.Component {
	 constructor(props) {
    super(props);
    this.state = {tag: "", images: ''};

  	this.handleChangeEvent = this.handleChangeEvent.bind(this);
  	this.handleSubmit = this.handleSubmit.bind(this);
  }

  handleChangeEvent(event){
  	this.setState({tag: event.target.value});
  }

	handleSubmit(event) {
    event.preventDefault();
    const sendTag = () => (
			new Promise((resolve, reject) => {
	     axios.post('/tag', {
		  		tag: this.state.tag,
			  })
	     if (this.state.tag){
					resolve(console.info('in sendtag'))
				} else {
					reject (error)
				}
		}))
		.then(() => {
			 axios.post('/images')
			 .then(res => {
			 	console.info("AXIOS:", res)
			 		this.setState({images: res})
			 })
		})
		.then((res) => {
		  console.info('IMAGES:', this.state);
		})
    .catch((error) => {
	    console.info(error);
	  });

		sendTag()

  }

	render (){
		return (
			<div>
				<form onSubmit = {this.handleSubmit}>
	          <input type = "text" 
	          onChange = {this.handleChangeEvent} 
	          className = "searchTerm" 
						placeholder = "Enter a tag" />
	        <input type = "submit" value = "Submit" />
	      </form>
				<div className = "grid-container">

				</div>
			</div>
		)
	}
}

export default SearchBar;

//Express
const express = require('express');
const app = express();
const path = require('path');
const bodyParser = require('body-parser');
const port = process.env.PORT || 5000;

//TUMBLR I
const tumblr = require('tumblr.js');

//TOKENS
const secret = require('./secret/config.js');

//MIDDLEWARE
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
app.use(express.static(path.join(__dirname, '../frontend/public')));

//INITIATE API
const client = tumblr.createClient({
	consumer_key: secret.consumer_key,
	consumer_secret: secret.consumer_secret,
	token: secret.token,
	token_secret: secret.token_secret
});

// API
new Promise(function(resolve, reject){
    app.post('/tag', (req, res) =>{
    	const tag = req.body.tag
    	if (tag){
					resolve(tag)
				} else {
					reject (error)
				}
			})
}).then(function(tag){
    return new Promise(function(resolve, reject){
    	console.info('TAG', tag)
    	console.info('tumble api')
      client.taggedPosts(tag, (error, data) => {
				if (data){
					console.info('data recieved')
					resolve(data)
				} else {
					reject (error)
					console.info('tumble api error')
				}
			})
    });
}).then(function(result){
    return new Promise(function(resolve, reject){
    	console.info('image to new variable')
    	const images = result
    	if (images){
    		resolve (images)
    	} else {
    		reject (error)
    	}
    })
}).then(function(images){
		console.info('send api')
   console.info('IMAGES', images)
			app.post('/images', (req, res) => {
				res.json(images)
			})
})

// FRONTEND ROUTE
app.get('/', (req, res) => {
	res.sendFile(path.join(__dirname, '../frontend/index.html'));
});

//SERVER
app.listen(port, () => console.info('Server running on localhost 5000!'));

module.exports = app;