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I'm trying to install composer on my Ubuntu 12.04 LTS machine, for Magento2 installation but the following error occurs:

Some settings on your machine make Composer unable to work properly. Make sure that you fix the issues listed below and run this script again: The json extension is missing. Install it or recompile php without --disable-json

I check that JSON is already installed through below command -

aptitude show php5-json

which shows below result -

 Package: php5-json State: installed Automatically installed: no Version: 1.3.7-1+deb.sury.org~precise+1 Priority: optional Section: php Maintainer: Debian PHP PECL Maintainers <[email protected]> Architecture: amd64 Uncompressed Size: 117 k Depends: libc6 (>= 2.14), libjson-c2 (>= 0.11-3~), phpapi-20121212, ucf Conflicts: php5-json Breaks: php5-common (< 5.5.0~rc1+dfsg-1~), php5-common (< 5.5.0~rc1+dfsg-1~), php5-dev (< 5.5.0~rc1+dfsg-1~), php5-dev (< 5.5.0~rc1+dfsg-1~) Replaces: php5-dev (< 5.5.0~rc1+dfsg-1~), php5-dev (< 5.5.0~rc1+dfsg-1~) Provided by: php5-common Description: JSON module for php5 This package provides a module for JSON functions in PHP scripts. PHP (recursive acronym for PHP: Hypertext Preprocessor) is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML.

please help to overcome with this.

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What is your php -m | grep json output? Do you have "json" as a result? If not then you need to enable this module in php.ini. A list of used php.ini files can be retrieved using php --ini.

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  • php -m | grep json output is nothing, What I have to write in php.ini? Commented Nov 18, 2015 at 10:17
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    Usually it is enough to run "sudo apt-get install php5-json" and it should get installed properly. You should find in your php.ini commented line "extension=json.so", if it is not present, then add it. Commented Nov 18, 2015 at 10:23
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Please make sure that the PHP extension not only installed but actually loaded by the PHP interpreter. You can see it by running the phpinfo function.

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