Node.js: How to search for modules that have a specified field?

Question

Main: How do i require modules that have example field in it's package.json?

For example:

const path = require( "path" );
const glob = require( "glob" );

const modules = glob.sync( './node_modules/*' );

for ( let mod in modules ) {
    const modPackage = require( path.resolve( __dirname, "node_modules", mod, "package.json" ) );
    if ( modPackage.hasOwnProperty( "example" ) ) {
        console.log( "Module:", mod, "Has Field 'example'" );
    }
}

Addiotinal: How do i require modules that have a specific tag? (for example: "demo")

your question is ambiguous , what you grammatically as in the name, is that you want a search in package.json for a particular file but you do not want to invoke that file. please elaborate — Remario, Mar 18 '17 at 10:55

score 0 · Accepted Answer · edited May 23 '17 at 10:29

0

It looks to me like your code is basically correct, just two issues:

You wanted for-of, not for-in.
No need to add /node_modules/ to the path.

So:

const path = require( "path" );
const glob = require( "glob" );

const modules = glob.sync( './node_modules/*' );

for (let mod of modules ) {
// ----------^^
    const modPackage = require( path.resolve( __dirname, mod, "package.json" ) );
// ------------------------------------------------------^
    if ( modPackage.hasOwnProperty( "example" ) ) {
        console.log( "Module:", mod, "Has Field 'example'" );
    }
}

You almost never want to use for-in on arrays. More about looping through arrays in this question's answers.

edited May 23 '17 at 10:29

Community

1
1

answered Mar 18 '17 at 11:21

T.J. Crowder

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No, the code is just example that i was written. i need best practice to do it. – Hasan Bayat Mar 18 '17 at 12:01
@HasanBayat: I don't see a problem with the above. How else would you do it? I mean, you could use `readFile` and `JSON.parse` instead of `require`, but... – T.J. Crowder Mar 18 '17 at 12:08
Is there any package that do it? – Hasan Bayat Mar 18 '17 at 12:11

Node.js: How to search for modules that have a specified field?

1 Answers1