Fatal error with jsoncpp while compiling

Question

Am new to cpp but as per project requirements i need to consume rest api and parse the response. Am able to call api & capture the response but not able to parse it using JSONCPP library.

These are the steps i followed to parse json:

Used this command to install libjsoncpp in ubuntu sudo apt-get install libjsoncpp-dev
Downloaded json source files and copied json header files into project folder
Compiling cpp using this command gcc -o test.out test.cpp -ljson

it is always giving

fatal error: json/json.h: No such file or directory
 #include <json/json.h>
                       ^
compilation terminated.

Didn't find any solution since 2 days. Tried this also. Can any one tell me where i am going wrong...

What does "Downloaded json source files and copied json header files into project folder" mean exactly? — John Zwinck
– John Zwinck, Commented Apr 26, 2016 at 9:57
I was facing same issue as this on macos. For me converting #include <json/json.h> to #include "json/json.h" did the trick. — ishandutta2007
– ishandutta2007, Commented Jun 8, 2023 at 7:14

John Zwinck · Accepted Answer · 2016-04-26 10:01:29Z

11

Since you're on Ubuntu I went to their package website and found the file list for the package you installed: http://packages.ubuntu.com/trusty/amd64/libjsoncpp-dev/filelist

The first few files make the problem clear:

/usr/include/jsoncpp/json/autolink.h
/usr/include/jsoncpp/json/config.h
/usr/include/jsoncpp/json/features.h
/usr/include/jsoncpp/json/forwards.h
/usr/include/jsoncpp/json/json.h

Since compilers usually look in /usr/include, you need to provide the rest of the path, i.e.:

#include <jsoncpp/json/json.h>

You could also have found this file on your running system after installing the package by running this command:

locate json.h

Or using the dpkg command after installing the package.

And when you link your program, you need to say -ljsoncpp, not -ljson.

answered Apr 26, 2016 at 10:01

John Zwinck

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11 Comments

Avi Parshan Over a year ago

I'm confused, what does he have to change with the #include statement

rayryeng Over a year ago

@AviParshan Instead of #include <json/json.h>, it's #include <jsoncpp/json/json.h>.

Akil Demir Over a year ago

Hello, I am having the same issue on mac. Although I installed the jsoncpp lib and cmake command runs fine, but make command complains about "jsoncpp/json/json.h" not found But my IDE shows the the file when I change the include into json/json.hand doesn't give any error but make command still says "json/json.h" not found have any idea?

John Zwinck Over a year ago

@AkilDemir: Search your disk for json.h. What's the full path to it?

John Zwinck Over a year ago

Right, you need to add /usr/local/include to your include path.

|

peter zhang · Accepted Answer · 2019-06-15 12:13:25Z

6

another solution:

sudo apt-get install libjsoncpp-dev 
sudo ln -s /usr/include/jsoncpp/json/ /usr/include/json

answered Jun 15, 2019 at 12:13

peter zhang

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