In case someone get stuck in the same problem again, below are the tested steps to have user attributes updated via aws cli with json file.
Step 0: Setup AWS CLI in case you haven't already. Mac users can run:
brew install awscli
Step 1: Have a valid json handy with you, saved in a file. Sample json with valid format:
{
"UserAttributes": [{
"Name": "custom:additional-attribute1",
"Value": "Value for additional attribute 1"
},
{
"Name": "custom:additional-attribute2",
"Value": "Value for additional attribute 2"
}
]
}
Step 2: Run the following in your console:
aws cognito-idp admin-update-user-attributes --user-pool-id XX-XXXX-X_XXXXXXXXX --username XXXXX@XXXXX.com --cli-input-json file:///Users/YOUR_PATH_TO_THE_FILE/user-attributes.json
Parameters:
--user-pool-id :: Your user pool ID.
--username :: The user you want to udpate.
--cli-input-json :: This is the command that loads json file and parses it.
That's it. If your json is valid and aws cli authorises, the given user record should be updated instantly.