POST a Python list to a Node.js server expecting payload consisting of an array containing JSON

Question

I am trying to send a POST request (in Python) to a server that is expecting an array containing JSON. I can't seem to format the data properly. How can I format the following payload to behave like a JavaScript array for a Node.js server?

POST /api/adduser/

Node.js expected Payload:

[ 
    {'user':'jon','email':'[email protected]'}, 
    {'user':'jon2','email':'[email protected]'} 
]

My current code:

import requests
import json

payload = \
[
   {
       'user': 'hello',
       'email': '[email protected]'
   },
   {
       'user': 'helloAgain',
       'email': '[email protected]'
   }
]

res = requests.post('http://localhost/api/users', data=json.dumps(payload))

#res -> 400 error -> reason:  "wrong json format - must be an array"

Brian - This is what I tried initially, but I get the error, "wrong json format - must be an array". The server that is handling the POST is nodejs. — eli1627384950
– eli1627384950, Commented Jun 25, 2014 at 8:35

thebjorn · Accepted Answer · 2014-06-23 17:52:27Z

1

Your expected payload is not correct (it's not JSON). Save yourself tons of headaches and use the json module:

import json
res = requests.post('http://localhost/api/users', data=json.dumps(payload))

answered Jun 23, 2014 at 17:52

thebjorn

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3 Comments

eli1627384950 Over a year ago

thebjorn - That does not work. The POST is processed by a nodejs server expecting an array.

thebjorn Over a year ago

Then you either need to set appropriate headers Content-Type: application/json (although I thought requests did that automatically) -- and/or call JSON.parse on the node side..

eli1627384950 Over a year ago

Great suggestion, though I do not have access to the server code. I am writing python code to integrate with an external application.

eli1627384950 · Accepted Answer · 2014-08-12 12:04:24Z

0

Here is the solution:

POST /api/adduser/

Node.js expected Payload:

[ 
    {'user':'jon','email':'[email protected]'}, 
    {'user':'jon2','email':'[email protected]'} 
]

My current code:

import requests
import json

payload = \
[
   {
       'user': 'hello',
       'email': '[email protected]'
   },
   {
       'user': 'helloAgain',
       'email': '[email protected]'
   }
]

jsonPayload = json.dumps(payload)

headers = {'Content-Type': 'application/json'}

res = requests.post('http://localhost/api/users', data=jsonPayload, headers=headers)

answered Aug 12, 2014 at 12:04

eli1627384950

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