diff --git a/lib/common.js b/lib/common.js
index 0dabe85..d76921b 100755
--- a/lib/common.js
+++ b/lib/common.js
@@ -72,10 +72,11 @@ function boolFromString(value, default_, errName) {
  * given an array return a string with each element
  * JSON-stringifed separated by newlines
  */
-function jsonStream(arr) {
-    return arr.map(function (elem) {
-        return JSON.stringify(elem);
-    }).join('\n');
+function jsonStream(arr, stream) {
+    stream = stream || process.stdout;
+    arr.forEach(function (elem) {
+        stream.write(JSON.stringify(elem) + '\n');
+    });
 }
 
 /**
diff --git a/lib/do_images.js b/lib/do_images.js
index 9556da0..9d1fc36 100644
--- a/lib/do_images.js
+++ b/lib/do_images.js
@@ -50,7 +50,7 @@ function do_images(subcmd, opts, args, callback) {
             // XXX we should have a common method for all these:
             //      XXX sorting
             //      XXX if opts.o is given, then filter to just those fields?
-            console.log(common.jsonStream(imgs));
+            common.jsonStream(imgs);
         } else {
             // Add some convenience fields
             // Added fields taken from imgapi-cli.git.
diff --git a/lib/do_instances.js b/lib/do_instances.js
index d2805e8..06d2c8a 100644
--- a/lib/do_instances.js
+++ b/lib/do_instances.js
@@ -99,7 +99,7 @@ function do_instances(subcmd, opts, args, callback) {
         });
 
         if (opts.json) {
-            console.log(common.jsonStream(machines));
+            common.jsonStream(machines);
         } else {
             tabula(machines, {
                 skipHeader: opts.H,
diff --git a/lib/do_keys.js b/lib/do_keys.js
index add02bf..0ba8054 100644
--- a/lib/do_keys.js
+++ b/lib/do_keys.js
@@ -22,7 +22,7 @@ function do_keys(subcmd, opts, args, callback) {
         }
 
         if (opts.json) {
-            console.log(common.jsonStream(keys));
+            common.jsonStream(keys);
         } else {
             // pretty print
             keys.forEach(function (key) {
diff --git a/lib/do_networks.js b/lib/do_networks.js
index 088eb6c..6d5b37c 100644
--- a/lib/do_networks.js
+++ b/lib/do_networks.js
@@ -55,7 +55,7 @@ function do_networks(subcmd, opts, args, callback) {
         }
 
         if (opts.json) {
-            console.log(common.jsonStream(networks));
+            common.jsonStream(networks);
         } else {
             // pretty print
             tabula(networks, {
diff --git a/lib/do_packages.js b/lib/do_packages.js
index 50c84e3..30c355e 100644
--- a/lib/do_packages.js
+++ b/lib/do_packages.js
@@ -41,7 +41,7 @@ function do_packages (subcmd, opts, args, callback) {
             return;
         }
         if (opts.json) {
-            console.log(common.jsonStream(pkgs));
+            common.jsonStream(pkgs);
         } else {
             for (var i = 0; i < pkgs.length; i++) {
                 var pkg = pkgs[i];