using curl and json with express server

I wanted to test some api on my local express server using curl and json formated datas, following curl documentation, like :

curl -v -k -H 'Content-Type:application/json' -d '{"test":"test"}'

No json parsed in express and exposed headers are wrong :


I removed quotes from Content-type, headers are correct but now express.json() middleware send an error :

Unexpected token ‘ in JSON at position 0

I tried to rewrite datas :





..etc I think I tried all ways i could to write them..

only {} an “{}” don’t throw parse error

I tried then to look at what express receive as datas using middleware raw(), on top of json’s one, and I get nothing to parse, no body, no datas. (second issue/misunderstanding here)

I specify everything works fine outside curl (react app using fetch).

curl 7.79.1, nodejs 16, express 4

Somebody ran into this issue? curl is a cool tool, but i’m really confused here.. ;(, Thanks in advance!


Thank you for visiting the Q&A section on Magenaut. Please note that all the answers may not help you solve the issue immediately. So please treat them as advisements. If you found the post helpful (or not), leave a comment & I’ll get back to you as soon as possible.

Method 1

On Windows, you must use double quotes: curl -H "Content-Type:application/json" -d "{"test": "test"}" ...

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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