Using CURL POST with Json format payload

Question

I am testing a API using CURL in my local server. I need to use CURL GET request with a Json parameters.

My Json will be like: { "key1" :[{subkey1":"subvalue1","subkey2":"subvalue2"}], "key2" :[{subkey3":"subvalue3","subkey4":"subvalue4"}]} And I tried: curl -i http://localhost/test/api?key1

or save my json file as a test.txt and use curl -X POST -H 'Content-type:application/json' --data-binary '@D:/test.txt' http://localhost/test/api?key1

.....but none of them work.... So how could I use a curl to create a post request with payload? Thanks!

I want to get the return value as key1 = [ ***] key2 = [####]

At first you said you were trying to make a GET request and then later a POST request - which once does the server actually accept? — Windle
– Windle, Commented Mar 30, 2023 at 14:36

hanshenrik · Accepted Answer · 2023-03-30 11:46:26Z

There are many different ways to send JSON with curl. Consult your API documentation to check which method you should use.

Here are some common ones:

sending json in a application/x-www-form-urlencoded POST request can be done like:

curl http://example.com --data-urlencode json='{"foo":"bar"}'

the request will then look like:

POST / HTTP/1.1
Host: example.com
User-Agent: curl/7.87.0
Accept: */*
Content-Length: 32
Content-Type: application/x-www-form-urlencoded

json=%7B%22foo%22%3A%22bar%22%7D

json in a multipart/form-data POST request can be done like:

curl http://example.com --form json='{"foo":"bar"}'

the request will then look like

POST / HTTP/1.1
Host: example.com
User-Agent: curl/7.87.0
Accept: */*
Content-Length: 152
Content-Type: multipart/form-data; boundary=------------------------ca36a58e4d11c82e

--------------------------ca36a58e4d11c82e
Content-Disposition: form-data; name="json"

{"foo":"bar"}
--------------------------ca36a58e4d11c82e--

sending raw json in a POST request can be done like:

curl --header 'Content-Type: application/json' --request POST --data-binary '{"foo":"bar"}'

the request will then look like

POST / HTTP/1.1
Host: example.com
User-Agent: curl/7.87.0
Accept: */*
Content-Type: application/json
Content-Length: 13

{"foo":"bar"}

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