use pipe for curl data

Question

I'm trying to pass the cat output to curl:

$ cat file | curl --data '{"title":"mytitle","input":"-"}' http://api

But input is literally a -.

Answer 1

You can use the magical stdin file /dev/stdin

cat data.json | curl -H "Content-Type: application/json" -X POST -d "$(</dev/stdin)" http://api

Answer 2

# Create the input file
echo -n 'Try                                                                     

                                                        
            

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Answer 3

I spent a while trying to figure this out and got it working with the following:

cat data.json | curl -H "Content-Type: application/json" -X POST -d @- http://api

Answer 4

Curl documentation for -d option

If you start the data with the letter @, the rest should be a file name to read the data from, or - if you want curl to read the data from stdin. Multiple files can also be specified. Posting data from a file named 'foobar' would thus be done with -d, --data @foobar. When --data is told to read from a file like that, carriage returns and newlines will be stripped out. If you don't want the @ character to have a special interpretation use --data-raw instead.

Depending of your HTTP endpoint, server configuration, you should be good by using this format:

curl -d @data.json http://api

Answer 5

Sounds like you want to wrap the content of input in a JSON body, and then have that sent over with a POST request. I think that the simplest way to do that is to manipulate stdin first and then push that over to curl using -d @-. One way could look like this:

cat <(echo '{"title":"mytitle","input":"') file <(echo '"}') \
| curl -d @- http://api

I'm using <(echo) to use cat to merge strings and files, but there is almost certainly a better way.

Keep in mind that this does not escape the contents of file and that you may run into issues because of that.

Answer 6

Try

curl --data '{"title":"mytitle","input":"'$(cat file)'-"}' http://api