How to PUT a json object with an array using curl
I have a series of data to enter into database. The user interface to enter the data isn't good for bulk entry, so I'm trying to formulate a command line equivalent. When I examine the network request of the UI in chrome, I see a PUT request of a json object. When I try to replicate the request
curl -H 'Accept: application/json' -X PUT '{"tags":["tag1","tag2"],"question":"Which band?","answers":[{"id":"a0","answer":"Answer1"},{"id":"a1","answer":"answer2"}]}' http://example.com/service`
I get a error
curl: (3) [globbing] nested braces not supported at pos X
Where X is the character position of first "[".
How can I PUT a json object that includes an array?
Your command line should have a -d/--data inserted before the string you want to send in the PUT, and you want to set the Content-Type and not Accept.
curl -H 'Content-Type: application/json' -X PUT -d '[JSON]' http://example.com/service
Using the exact JSON data from the question, the full command line would become:
curl -H 'Content-Type: application/json' -X PUT
-d '{"tags":["tag1","tag2"],"question":"Which band?","answers":[{"id":"a0","answer":"Answer1"},{"id":"a1","answer":"answer2"}]}'
http://example.com/service
Although the original post had other issues (ie the missing "-d"), the error message is more generic.
curl: (3) [globbing] nested braces not supported at pos X
This is because curly braces {} and square brackets [] are special globbing characters in curl. To turn this globbing off, use the " -g " option.
As an example, the following Solr facet query will fail without the "-g" to turn off curl globbing : curl -g 'http://localhost:8983/solr/query?json.facet={x:{terms:"myfield"}}'
It should be mentioned that the Accept header tells the server something about what we are accepting back, whereas the relevant header in this context is Content-Type
It's often advisable to specify Content-Type as application/json when sending JSON. For curl the syntax is:
-H 'Content-Type: application/json'
So the complete curl command will be:
curl -H 'Content-Type: application/json' -H 'Accept: application/json' -X PUT -d '{"tags":["tag1","tag2"],"question":"Which band?","answers":[{"id":"a0","answer":"Answer1"},{"id":"a1","answer":"answer2"}]}' http://example.com/service`
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