Read the body of a Fetch Promise
fetch-api, javascript, node.js
Solution
Notice you're dealing with a Response object. You need to basically read the response stream with `Response.json()` or `Response.text()` (or via other methods) in order to see your data. Otherwise your response body will always appear as a locked readable stream. For example:
fetch('https://api.ipify.org?format=json')
.then(response=>response.json())
.then(data=>{ console.log(data); })
If this gives you unexpected results, you may want to inspect your response with Postman.
Problem
I have the following express endpoint for uploading to Google Cloud storage. It works great and the response from the google api gives me a unique file name that I want to pass back to my front end: ``` app.post('/upload', (req, res) => { var form = new formidable.IncomingForm(), files = [], fields = []; form .on('field', function(field, value) { fields.push([field, value]); }) .on('file', function(field, file) { files.push([field, file]); }) .on('end', function() { console.log('-> upload done'); }); form.parse(req, function(err, fields, files){ var filePath = files.file.path; bucket.upload(filePath, function(err, file, apiResponse){ if (!err){ res.writeHead(200, {'content-type': 'text/plain'}); res.end("Unique File Name:" + file.name); }else{ res.writeHead(500); res.end(); } }); }); return; }); ``` I reach this endpoint by calling a short function which passes the file to it: ``` function upload(file) { var data = new FormData(); data.append('file', file); return fetch(`upload`,{ method: 'POST', body: data }); } const Client = { upload }; export default Client; ``` This function is called from my front end like this: ``` Client.upload(this.file).then((data) => { console.log(data); }); ``` This final `console.log(data)` logs the response to the console. However, I don't see anywhere the response that I wrote in (`"Unique File Name:" + file.name`) How I can retrieve this info from the response body on the client-side? The `data` looks like this when I console.log it: This is the response I get when I POST a file to my endpoint using Postman: