diff --git a/src/main/java/edu/sc/seis/TauP/Arrival.java b/src/main/java/edu/sc/seis/TauP/Arrival.java
index c3b5d159..e56f71b2 100644
--- a/src/main/java/edu/sc/seis/TauP/Arrival.java
+++ b/src/main/java/edu/sc/seis/TauP/Arrival.java
@@ -614,7 +614,7 @@ public void writeJSON(PrintWriter pw, String indent) throws IOException {
             } else {
                 pw.write(innerIndent+"  "+JSONWriter.valueToString("error")+": "+JSONWriter.valueToString("geometrical speading not finite")+","+NL);
             }
-            pw.write(innerIndent+"  "+JSONWriter.valueToString("refltranpsv")+": "+JSONWriter.valueToString((float)getReflTransPSV())+NL);
+            pw.write(innerIndent+"  "+JSONWriter.valueToString("refltranpsv")+": "+JSONWriter.valueToString((float)getReflTransPSV())+", "+NL);
             pw.write(innerIndent+"  "+JSONWriter.valueToString("refltransh")+": "+JSONWriter.valueToString((float)getReflTransSH())+NL);
             pw.write(innerIndent+"}");
         } catch (TauPException e) {
diff --git a/src/test/java/edu/sc/seis/TauP/CmdLineOutputTest.java b/src/test/java/edu/sc/seis/TauP/CmdLineOutputTest.java
index a47bb784..b2c64ba7 100644
--- a/src/test/java/edu/sc/seis/TauP/CmdLineOutputTest.java
+++ b/src/test/java/edu/sc/seis/TauP/CmdLineOutputTest.java
@@ -5,6 +5,8 @@
 import static org.junit.jupiter.api.Assertions.assertNotNull;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 
+import org.json.JSONObject;
+import org.json.JSONTokener;
 import org.junit.jupiter.api.Test;
 
 import java.io.BufferedOutputStream;
@@ -112,6 +114,10 @@ public class CmdLineOutputTest {
                                           "taup wkbj --help",
     };
 
+    String[] jsonTestCmds = new String[] {
+            "taup time -h 10 -ph P -deg 35 --json",
+    };
+
     String versionCmd = "taup --version";
 
     String[] docCmds = new String[] {
@@ -144,6 +150,7 @@ public void regenSavedOutput() throws Exception {
         allList.addAll(Arrays.asList(velplotTestCmds));
         allList.addAll(Arrays.asList(reflTransPlotTestCmds));
         allList.addAll(Arrays.asList(phaseDescribeTestCmds));
+        allList.addAll(Arrays.asList(jsonTestCmds));
         for (String cmd : allList) {
             System.err.println(cmd);
             saveTestOutputToFile(cmd);
@@ -318,6 +325,11 @@ public void testTauPReflTransplot() throws Exception {
         runTests(reflTransPlotTestCmds);
     }
 
+
+    @Test
+    public void testTauPJSON() throws Exception {
+        runJsonTests(jsonTestCmds);
+    }
     @Test
     public void testTauPTable() throws Exception {
         // this one takes a lot of memory
@@ -330,6 +342,12 @@ public void runTests(String[] cmds) throws Exception {
         }
     }
 
+    public void runJsonTests(String[] cmds) throws Exception {
+        for (int i = 0; i < cmds.length; i++) {
+            testJsonCmd(cmds[i]);
+        }
+    }
+
     public void runCmd(String cmd) throws Exception {
         String[] s = cmd.split(" +");
         String tool = s[0];
@@ -371,6 +389,19 @@ public void testCmd(String cmd) throws Exception {
         origErr.println("Done with " + cmd);
     }
 
+    public void testJsonCmd(String cmd) throws Exception {
+        setUpStreams();
+        assertEquals(0, outContent.toByteArray().length, "sysout is not empty");
+        runCmd(cmd);
+        BufferedReader prior = getPriorOutput(cmd);
+        BufferedReader current = new BufferedReader(new InputStreamReader(new ByteArrayInputStream(outContent.toByteArray())));
+        JSONTokener jsonIn = new JSONTokener(prior);
+        JSONObject priorJson = new JSONObject(jsonIn);
+        JSONTokener currentIn = new JSONTokener(current);
+        JSONObject currentJson = new JSONObject(currentIn);
+        assertTrue(priorJson.similar(currentJson), currentJson.toString(2));
+    }
+
     /**
      * test loading prior results text file from test resources. Kind of a meta-test... :)
      * @throws Exception
diff --git a/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_P_-deg_35_--json b/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_P_-deg_35_--json
new file mode 100644
index 00000000..9524aaed
--- /dev/null
+++ b/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_P_-deg_35_--json
@@ -0,0 +1,25 @@
+{
+  "model": "iasp91",
+  "sourcedepth": 10,
+  "receiverdepth": 0,
+  "phases": [ "P" ],
+  "arrivals": [
+    {
+      "distdeg": 35,
+      "phase": "P",
+      "time": 412.4329,
+      "rayparam": 8.613012,
+      "takeoff": 26.741543,
+      "incident": 26.69624,
+      "puristdist": 35,
+      "puristname": "P",
+      "amp": {
+        "factorpsv": 2.0197284E-9,
+        "factorsh": 0,
+        "geospread": 8.546455E-9,
+        "refltranpsv": 0.9386537, 
+        "refltransh": 0
+      }
+    }
+  ]
+}
diff --git a/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_ttall_-deg_35_-mod_ak135_--json b/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_ttall_-deg_35_-mod_ak135_--json
index 9d29ab7e..dda711b7 100644
--- a/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_ttall_-deg_35_-mod_ak135_--json
+++ b/src/test/resources/edu/sc/seis/TauP/cmdLineTest/taup_time_-h_10_-ph_ttall_-deg_35_-mod_ak135_--json
@@ -17,7 +17,7 @@
         "factorpsv": 2.2448705E-9,
         "factorsh": 0,
         "geospread": 9.4910035E-9,
-        "refltranpsv": 0.93945855
+        "refltranpsv": 0.93945855, 
         "refltransh": 0
       }
     },
@@ -34,7 +34,7 @@
         "factorpsv": -1.0049341E-9,
         "factorsh": 0,
         "geospread": 6.4029417E-9,
-        "refltranpsv": -0.6233852
+        "refltranpsv": -0.6233852, 
         "refltransh": 0
       }
     },
@@ -51,7 +51,7 @@
         "factorpsv": 6.4090083E-10,
         "factorsh": 0,
         "geospread": 4.5169624E-9,
-        "refltranpsv": 0.5635634
+        "refltranpsv": 0.5635634, 
         "refltransh": 0
       }
     },
@@ -68,7 +68,7 @@
         "factorpsv": -5.602378E-10,
         "factorsh": 0,
         "geospread": 8.134539E-9,
-        "refltranpsv": -0.27355075
+        "refltranpsv": -0.27355075, 
         "refltransh": 0
       }
     },
@@ -85,7 +85,7 @@
         "factorpsv": 1.3256608E-10,
         "factorsh": -0,
         "geospread": -1.9293809E-9,
-        "refltranpsv": -0.27290586
+        "refltranpsv": -0.27290586, 
         "refltransh": 0
       }
     },
@@ -102,7 +102,7 @@
         "factorpsv": 2.6919594E-10,
         "factorsh": -0,
         "geospread": -3.71326E-9,
-        "refltranpsv": -0.28794637
+        "refltranpsv": -0.28794637, 
         "refltransh": 0
       }
     },
@@ -119,7 +119,7 @@
         "factorpsv": -5.6609734E-11,
         "factorsh": 0,
         "geospread": 2.3569615E-9,
-        "refltranpsv": -0.09539752
+        "refltranpsv": -0.09539752, 
         "refltransh": 0
       }
     },
@@ -136,7 +136,7 @@
         "factorpsv": -1.3889002E-10,
         "factorsh": 0,
         "geospread": 5.318295E-9,
-        "refltranpsv": -0.10372825
+        "refltranpsv": -0.10372825, 
         "refltransh": 0
       }
     },
@@ -153,7 +153,7 @@
         "factorpsv": 3.416083E-10,
         "factorsh": 0,
         "geospread": 4.892863E-9,
-        "refltranpsv": 0.2773089
+        "refltranpsv": 0.2773089, 
         "refltransh": 0
       }
     },
@@ -170,7 +170,7 @@
         "factorpsv": -8.8572594E-10,
         "factorsh": -9.559001E-10,
         "geospread": -2.9885563E-9,
-        "refltranpsv": 0.90920216
+        "refltranpsv": 0.90920216, 
         "refltransh": 0.98123634
       }
     },
@@ -187,7 +187,7 @@
         "factorpsv": 4.1380797E-9,
         "factorsh": 0,
         "geospread": 1.3097071E-8,
-        "refltranpsv": 0.96927536
+        "refltranpsv": 0.96927536, 
         "refltransh": 0
       }
     },
@@ -204,7 +204,7 @@
         "factorpsv": 1.1673663E-11,
         "factorsh": 1.2368819E-9,
         "geospread": 3.867232E-9,
-        "refltranpsv": 0.009260394
+        "refltranpsv": 0.009260394, 
         "refltransh": 0.9811842
       }
     },
@@ -221,7 +221,7 @@
         "factorpsv": -1.1158017E-9,
         "factorsh": -0,
         "geospread": -5.35934E-9,
-        "refltranpsv": 0.82694024
+        "refltranpsv": 0.82694024, 
         "refltransh": 0
       }
     },
@@ -238,7 +238,7 @@
         "factorpsv": -2.5531965E-9,
         "factorsh": -0,
         "geospread": -8.364679E-9,
-        "refltranpsv": 0.93639153
+        "refltranpsv": 0.93639153, 
         "refltransh": 0
       }
     },
@@ -255,7 +255,7 @@
         "factorpsv": 7.988524E-11,
         "factorsh": 0,
         "geospread": 8.102375E-10,
-        "refltranpsv": 0.39160898
+        "refltranpsv": 0.39160898, 
         "refltransh": 0
       }
     },
@@ -272,7 +272,7 @@
         "factorpsv": 1.2438949E-9,
         "factorsh": -0,
         "geospread": -8.27238E-9,
-        "refltranpsv": -0.46129176
+        "refltranpsv": -0.46129176, 
         "refltransh": 0
       }
     },
@@ -289,7 +289,7 @@
         "factorpsv": -8.1902435E-10,
         "factorsh": -8.249301E-10,
         "geospread": -3.3388534E-9,
-        "refltranpsv": 0.7525268
+        "refltranpsv": 0.7525268, 
         "refltransh": 0.7579531
       }
     },
@@ -306,7 +306,7 @@
         "factorpsv": 1.0724646E-9,
         "factorsh": 9.91436E-10,
         "geospread": 4.542847E-9,
-        "refltranpsv": 0.72423136
+        "refltranpsv": 0.72423136, 
         "refltransh": 0.6695131
       }
     },
@@ -323,7 +323,7 @@
         "factorpsv": -4.3499293E-10,
         "factorsh": -5.341819E-10,
         "geospread": -1.5133576E-9,
-        "refltranpsv": 0.8817859
+        "refltranpsv": 0.8817859, 
         "refltransh": 1.0828545
       }
     },
@@ -340,7 +340,7 @@
         "factorpsv": 1.5740333E-12,
         "factorsh": -6.924226E-12,
         "geospread": -7.743721E-10,
-        "refltranpsv": -0.0062357215
+        "refltranpsv": -0.0062357215, 
         "refltransh": 0.02743115
       }
     },
@@ -357,7 +357,7 @@
         "factorpsv": -5.583343E-10,
         "factorsh": 2.9569622E-9,
         "geospread": 2.7051914E-9,
-        "refltranpsv": -0.63316786
+        "refltranpsv": -0.63316786, 
         "refltransh": 3.3532836
       }
     },
@@ -374,7 +374,7 @@
         "factorpsv": 1.95126E-11,
         "factorsh": 0,
         "geospread": 1.9792763E-9,
-        "refltranpsv": 0.0391568
+        "refltranpsv": 0.0391568, 
         "refltransh": 0
       }
     },
@@ -391,7 +391,7 @@
         "factorpsv": -2.5029583E-11,
         "factorsh": 0,
         "geospread": 2.5453137E-9,
-        "refltranpsv": -0.039058067
+        "refltranpsv": -0.039058067, 
         "refltransh": 0
       }
     },
@@ -408,7 +408,7 @@
         "factorpsv": 3.6171706E-13,
         "factorsh": 0,
         "geospread": 6.49183E-10,
-        "refltranpsv": 0.0022130962
+        "refltranpsv": 0.0022130962, 
         "refltransh": 0
       }
     },
@@ -425,7 +425,7 @@
         "factorpsv": -2.4197686E-10,
         "factorsh": -6.5053596E-10,
         "geospread": -2.0617155E-9,
-        "refltranpsv": 0.360054
+        "refltranpsv": 0.360054, 
         "refltransh": 0.9679771
       }
     },
@@ -442,7 +442,7 @@
         "factorpsv": 1.6212206E-12,
         "factorsh": 0,
         "geospread": 1.6025435E-9,
-        "refltranpsv": 0.0040181926
+        "refltranpsv": 0.0040181926, 
         "refltransh": 0
       }
     },
@@ -459,7 +459,7 @@
         "factorpsv": -1.1651941E-11,
         "factorsh": 0,
         "geospread": 2.0197959E-9,
-        "refltranpsv": -0.022913383
+        "refltranpsv": -0.022913383, 
         "refltransh": 0
       }
     },
@@ -476,7 +476,7 @@
         "factorpsv": -8.4029674E-13,
         "factorsh": 0,
         "geospread": 1.4995897E-9,
-        "refltranpsv": -0.0022256593
+        "refltranpsv": -0.0022256593, 
         "refltransh": 0
       }
     },
@@ -493,7 +493,7 @@
         "factorpsv": 2.7018132E-12,
         "factorsh": 0,
         "geospread": 2.1195457E-9,
-        "refltranpsv": 0.003910525
+        "refltranpsv": 0.003910525, 
         "refltransh": 0
       }
     },
@@ -510,7 +510,7 @@
         "factorpsv": 1.5691697E-13,
         "factorsh": 0,
         "geospread": 1.3950303E-9,
-        "refltranpsv": 3.4507122E-4
+        "refltranpsv": 3.4507122E-4, 
         "refltransh": 0
       }
     },
@@ -527,7 +527,7 @@
         "factorpsv": -1.1094422E-10,
         "factorsh": 0,
         "geospread": 5.4908333E-10,
-        "refltranpsv": -0.80253667
+        "refltranpsv": -0.80253667, 
         "refltransh": 0
       }
     },
@@ -544,7 +544,7 @@
         "factorpsv": -3.7748006E-11,
         "factorsh": 0,
         "geospread": 3.769393E-10,
-        "refltranpsv": -0.39775994
+        "refltranpsv": -0.39775994, 
         "refltransh": 0
       }
     },
@@ -561,7 +561,7 @@
         "factorpsv": 1.6563683E-13,
         "factorsh": 0,
         "geospread": 1.6232624E-9,
-        "refltranpsv": 3.130334E-4
+        "refltranpsv": 3.130334E-4, 
         "refltransh": 0
       }
     }