You want to send JSON data {"name":"John"} to http://api.example.com/users using curl. Which command has an error?

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Linux CLI - Networking Commands

You want to send JSON data {"name":"John"} to http://api.example.com/users using curl. Which command has an error?

Acurl -d '{name:John}' -X POST -H "Content-Type: application/json" http://api.example.com/users

Bcurl -X POST -H "Content-Type: application/json" -d '{"name":"John"}' http://api.example.com/users

Ccurl -d '{"name":"John"}' http://api.example.com/users -H "Content-Type: application/json" -X POST

Dcurl -X POST -d '{"name":"John"}' -H "Content-Type: application/json" http://api.example.com/users

Step-by-Step Solution

Solution:

Step 1: Check JSON data format
curl -d '{name:John}' -X POST -H "Content-Type: application/json" http://api.example.com/users uses '{name:John}' which misses double quotes around keys and values, making it invalid JSON. Options A, C, D use correct JSON '{"name":"John"}'.
Step 2: Confirm curl flags order
Order of flags does not matter in curl, so A, C, D are valid. Only data format in B is wrong.
Final Answer:
curl -d '{name:John}' -X POST -H "Content-Type: application/json" http://api.example.com/users -> Option A
Quick Check:
JSON must have quotes [OK]

Quick Trick: JSON keys and values need quotes [OK]

Common Mistakes:

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