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Node.js | process.config Property
  • Last Updated : 20 Feb, 2020

The process.config property is an inbuilt application programming interface of the process module which is used to get the JavaScript representation of the configure options that are used to compile the current node.js code.

Syntax:

process.config

Return Value: This property returns an object containing the configuration in JavaScript representation those are used to compile currently executable node.js.

Below examples illustrate the use of process.config property in Node.js:

Example 1:






// Node.js program to demonstrate the
// process.config Property
   
// Include process module
const process = require('process');
  
// Printing process.config property value
console.log(process.config);

Output:

{ target_defaults:
   { cflags: [],
     default_configuration: 'Release',
     defines: [],
     include_dirs: [],
     libraries: [] 
   },
  variables:
   { asan: 0,
     build_v8_with_gn: false,
     coverage: false,
     debug_nghttp2: false,
     enable_lto: false,
     enable_pgo_generate: false,
     enable_pgo_use: false,
     force_dynamic_crt: 0,
     host_arch: 'x64',
     icu_data_in: '..\\..\\deps/icu-small\\source/data/in\\icudt64l.dat',
     icu_endianness: 'l',
     icu_gyp_path: 'tools/icu/icu-generic.gyp',
     icu_locales: 'en, root',
     icu_path: 'deps/icu-small',
     icu_small: true,
     icu_ver_major: '64',
     nasm_version: '2.14',
     node_byteorder: 'little',
     node_debug_lib: false,
     node_enable_d8: false,
     node_enable_v8_vtunejit: false,
     node_install_npm: true,
     node_module_version: 64,
     node_no_browser_globals: false,
     node_prefix: '/usr/local',
     node_release_urlbase: 'https://nodejs.org/download/release/',
     node_shared: false,
     node_shared_cares: false,
     node_shared_http_parser: false,
     node_shared_libuv: false,
     node_shared_nghttp2: false,
     node_shared_openssl: false,
     node_shared_zlib: false,
     node_tag: '',
     node_target_type: 'executable',
     node_use_bundled_v8: true,
     node_use_dtrace: false,
     node_use_etw: true,
     node_use_large_pages: false,
     node_use_openssl: true,
     node_use_pch: false,
     node_use_perfctr: true,
     node_use_v8_platform: true,
     node_with_ltcg: true,
     node_without_node_options: false,
     openssl_fips: '',
     openssl_no_asm: 0,
     shlib_suffix: 'so.64',
     target_arch: 'x64',
     v8_enable_gdbjit: 0,
     v8_enable_i18n_support: 1,
     v8_enable_inspector: 1,
     v8_no_strict_aliasing: 1,
     v8_optimized_debug: 0,
     v8_promise_internal_field_count: 1,
     v8_random_seed: 0,
     v8_trace_maps: 0,
     v8_typed_array_max_size_in_heap: 0,
     v8_use_snapshot: true,
     want_separate_host_toolset: 0 
   } 
}

Example 2:




// Node.js program to demonstrate the
// process.config Property
   
// Include process module
const process = require('process');
  
// Printing process.config property value
var no_conf = 0;
var conf = process.config;
for (var key in conf) {
    console.log(key);
    var sub_conf = conf[key];
     
    for (var attr in sub_conf){
        console.log("\t" + attr + "=>" + sub_conf[attr]);
        no_conf++;
    }
}
  
console.log("total no of configuration available is "
                    + no_conf);

Output:

target_defaults
        cflags=>
        default_configuration=>Release
        defines=>
        include_dirs=>
        libraries=>
variables
        asan=>0
        build_v8_with_gn=>false
        coverage=>false
        debug_nghttp2=>false
        enable_lto=>false
        enable_pgo_generate=>false
        enable_pgo_use=>false
        force_dynamic_crt=>0
        host_arch=>x64
        icu_data_in=>..\..\deps/icu-small\source/data/in\icudt64l.dat
        icu_endianness=>l
        icu_gyp_path=>tools/icu/icu-generic.gyp
        icu_locales=>en, root
        icu_path=>deps/icu-small
        icu_small=>true
        icu_ver_major=>64
        nasm_version=>2.14
        node_byteorder=>little
        node_debug_lib=>false
        node_enable_d8=>false
        node_enable_v8_vtunejit=>false
        node_install_npm=>true
        node_module_version=>64
        node_no_browser_globals=>false
        node_prefix=>/usr/local
        node_release_urlbase=>https://nodejs.org/download/release/
        node_shared=>false
        node_shared_cares=>false
        node_shared_http_parser=>false
        node_shared_libuv=>false
        node_shared_nghttp2=>false
        node_shared_openssl=>false
        node_shared_zlib=>false
        node_tag=>
        node_target_type=>executable
        node_use_bundled_v8=>true
        node_use_dtrace=>false
        node_use_etw=>true
        node_use_large_pages=>false
        node_use_openssl=>true
        node_use_pch=>false
        node_use_perfctr=>true
        node_use_v8_platform=>true
        node_with_ltcg=>true
        node_without_node_options=>false
        openssl_fips=>
        openssl_no_asm=>0
        shlib_suffix=>so.64
        target_arch=>x64
        v8_enable_gdbjit=>0
        v8_enable_i18n_support=>1
        v8_enable_inspector=>1
        v8_no_strict_aliasing=>1
        v8_optimized_debug=>0
        v8_promise_internal_field_count=>1
        v8_random_seed=>0
        v8_trace_maps=>0
        v8_typed_array_max_size_in_heap=>0
        v8_use_snapshot=>true
        want_separate_host_toolset=>0
total no of configuration available is 65

Note: The above program will compile and run by using the node filename.js command.

Reference: https://nodejs.org/api/process.html#process_process_config

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