implemented ability to print JSON report to console

README.md

@@ -64,6 +64,7 @@ Options
   -d, --dev-only        Look at devDependencies only (skip dependencies).
   -i, --ignore          Ignore dependencies based on succeeding glob.
   -E, --save-exact      Save exact version (x.y.z) instead of caret (^x.y.z) in package.json.
+  --json                Save Json report to file
   --specials            List of depcheck specials to include in check for unused dependencies.
   --no-color            Force or disable color output.
   --no-emoji            Remove emoji support. No emoji in default in CI environments.
@@ -149,6 +150,12 @@ Install packages using `--save-exact`, meaning exact versions will be saved in p
 
 Applies to both `dependencies` and `devDependencies`.
 
+#### `--json`
+
+Print out the Json report.
+
+`$ npm-check --json > /home/user/report.json` will save JSON report to `/home/user/report.json`.
+
 #### `--specials`
 
 Check special (e.g. config) files when looking for unused dependencies.

lib/cli.js

@@ -8,6 +8,7 @@ const createCallsiteRecord = require('callsite-record');
 const pkg = require('../package.json');
 const npmCheck = require('./index');
 const staticOutput = require('./out/static-output');
+const jsonOutput = require('./out/json-output');
 const interactiveUpdate = require('./out/interactive-update');
 const updateAll = require('./out/update-all');
 const debug = require('./state/debug');
@@ -33,6 +34,7 @@ const cli = meow(`
           -d, --dev-only        Look at devDependencies only (skip dependencies).
           -i, --ignore          Ignore dependencies based on succeeding glob.
           -E, --save-exact      Save exact version (x.y.z) instead of caret (^x.y.z) in package.json.
+          --json                Print Json report.
           --specials            List of depcheck specials to include in check for unused dependencies.
           --no-color            Force or disable color output.
           --no-emoji            Remove emoji support. No emoji in default in CI environments.
@@ -77,6 +79,9 @@ const cli = meow(`
                 type: 'string',
                 alias: 'i'
             },
+            json: {
+                type: 'boolean'
+            },
             specials: {
                 type: 'string'
             },
@@ -108,6 +113,7 @@ const options = {
     ignoreDev: cli.flags.production,
     devOnly: cli.flags.devOnly,
     saveExact: cli.flags.saveExact,
+    json: cli.flags.json,
     specials: cli.flags.specials,
     emoji: cli.flags.emoji,
     installer: process.env.NPM_CHECK_INSTALLER || 'auto',
@@ -142,6 +148,10 @@ Promise.resolve()
             return interactiveUpdate(currentState);
         }
 
+        if (options.json) {
+            return jsonOutput(currentState);
+        }
+
         return staticOutput(currentState);
     })
     .catch(error => {

lib/out/json-output

@@ -0,0 +1,13 @@
+'use strict';
+
+const chalk = require('chalk');
+const _ = require('lodash');
+const fs = require("fs");
+
+function outputJSON(currentState, filename) {
+    const packages = currentState.get('packages');
+    console.log(JSON.stringify(packages, null, 4));
+    process.exitCode = 0;
+}
+
+module.exports = outputJSON;

lib/state/state.js

@@ -14,6 +14,7 @@ const defaultOptions = {
     devOnly: false,
     forceColor: false,
     saveExact: false,
+    json: false,
     specials: '',
     debug: false,
     emoji: true,