I am passing uploaded file and dataObject in FormData:

let data = new FormData();
data.append("file", this.state.files);
data.append("data", formData);

formData is just a Json Object eg: formData = { "a":123 }

Passing data to the node server using put request with axios ,I am able to get the file object and data in req, but in data field it's giving '[object Object]'

Don't know how to access this. I tried JSON.parse(req.body.data), but getting error

SyntaxError: Unexpected token o in JSON at position 1

I am passing uploaded file and dataObject in FormData:

let data = new FormData();
data.append("file", this.state.files);
data.append("data", formData);

formData is just a Json Object eg: formData = { "a":123 }

Passing data to the node server using put request with axios ,I am able to get the file object and data in req, but in data field it's giving '[object Object]'

Don't know how to access this. I tried JSON.parse(req.body.data), but getting error

SyntaxError: Unexpected token o in JSON at position 1

• javascript
• node.js
• reactjs
• form-data

• 2 try using JSON.stringify(data) before sending it to the server – Silvio Biasiol Commented Feb 19, 2019 at 15:46
• there's not enough context here, but it sounds like you've passed an actual JS object, which natively stringifies to that unhelpful [object Object]. You probably want to call JSON.stringify on it before you send it – Robin Zigmond Commented Feb 19, 2019 at 15:47
• what is formData object? You probably need to do JSON.stringify(formData) – Andrey Commented Feb 19, 2019 at 15:47

2 Answers 2

Looks like formData is an object that's cast to string [object Object] prior to being sent on the wire. Try data.append("data", JSON.stringify(formData)).

Send the object with JSON.stringify and then use JSON.parse once you receive data, to make the string object an object again.