xref: /curl/docs/cmdline-opts/json.md (revision adca93b5)
1---
2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
3SPDX-License-Identifier: curl
4Long: json
5Arg: <data>
6Help: HTTP POST JSON
7Protocols: HTTP
8Mutexed: form head upload-file
9Category: http post upload
10Added: 7.82.0
11Multi: append
12See-also:
13  - data-binary
14  - data-raw
15Example:
16  - --json '{ "drink": "coffe" }' $URL
17  - --json '{ "drink":' --json ' "coffe" }' $URL
18  - --json @prepared $URL
19  - --json @- $URL < json.txt
20---
21
22# `--json`
23
24Sends the specified JSON data in a POST request to the HTTP server. --json
25works as a shortcut for passing on these three options:
26
27    --data-binary [arg]
28    --header "Content-Type: application/json"
29    --header "Accept: application/json"
30
31There is **no verification** that the passed in data is actual JSON or that
32the syntax is correct.
33
34If you start the data with the letter @, the rest should be a filename to read
35the data from, or a single dash (-) if you want curl to read the data from
36stdin. Posting data from a file named 'foobar' would thus be done with --json
37@foobar and to instead read the data from stdin, use --json @-.
38
39If this option is used more than once on the same command line, the additional
40data pieces are concatenated to the previous before sending.
41
42The headers this option sets can be overridden with --header as usual.
43