diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000000000000000000000000000000000000..54ca2d7fdaaeed4de60fccca63277f766cb2e0dc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+# Created by .ignore support plugin (hsz.mobi)
+JsonFileCompare.iml
+target/
diff --git a/README.md b/README.md
index 5d60fdafc2b353057b7a483bb898d5d9892792fa..339f177b96b045c4d78a01975e0884a0f5a4f501 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,15 @@
 # JsonFileCompare
 
+### Find missing key in Target json file
+
+```
+mvn package
+```
+
+可以在target下找到JsonFileCompare-exec.jar
+
+ ```java
+java -cp JsonFileCompare-exec.jar JsonFileCompare /xxx/locale-zh_TW.json /xxx/locale-zh_CN.json /xxx/locale-en_US.json
+```
+
+P.S 第一個參數為基準的json, 後面為要找出缺少key的目標檔案
diff --git a/pom.xml b/pom.xml
new file mode 100644
index 0000000000000000000000000000000000000000..c1b7e26b5cc16a5db0060b9d2f5906411bf4c090
--- /dev/null
+++ b/pom.xml
@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>org.ylhealth</groupId>
+    <artifactId>JsonFileCompare</artifactId>
+    <version>0.0.1</version>
+    <packaging>jar</packaging>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+    <dependencies>
+        <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.9.7</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <!-- any other plugins -->
+            <plugin>
+                <artifactId>maven-assembly-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>single</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <descriptorRefs>
+                        <descriptorRef>jar-with-dependencies</descriptorRef>
+                    </descriptorRefs>
+                    <finalName>JsonFileCompare-exec</finalName>
+                    <appendAssemblyId>false</appendAssemblyId>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>
diff --git a/src/main/java/JsonFileCompare.java b/src/main/java/JsonFileCompare.java
new file mode 100644
index 0000000000000000000000000000000000000000..9cd4440826ab5d03c90c95b21acf431e7f5b0598
--- /dev/null
+++ b/src/main/java/JsonFileCompare.java
@@ -0,0 +1,89 @@
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.node.ArrayNode;
+import com.fasterxml.jackson.databind.node.ObjectNode;
+
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.*;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+public class JsonFileCompare {
+
+  public static void main(String[] args) {
+
+
+    try {
+      ObjectMapper objectMapper = new ObjectMapper();
+      Path originPath = Paths.get(args[0]);
+      JsonNode twJson = objectMapper.readTree(new String(Files.readAllBytes(originPath)));
+      Set<String> originSet = new HashSet<>();
+      addKeys("", twJson, originSet, new ArrayList<>());
+
+      IntStream.range(1, args.length).forEach(i -> findMissingKeys(Paths.get(args[i]), originSet));
+
+    } catch (Exception e) {
+      System.err.println(args[0] + " is not exists or not json files.");
+      System.exit(1);
+    }
+  }
+
+  public static void addKeys(String currentPath, JsonNode jsonNode, Set set, List<Integer> suffix) {
+    if (jsonNode.isObject()) {
+      ObjectNode objectNode = (ObjectNode) jsonNode;
+      Iterator<Map.Entry<String, JsonNode>> iter = objectNode.fields();
+      String pathPrefix = currentPath.isEmpty() ? "" : currentPath + "-";
+
+      while (iter.hasNext()) {
+        Map.Entry<String, JsonNode> entry = iter.next();
+        addKeys(pathPrefix + entry.getKey(), entry.getValue(), set, suffix);
+      }
+    } else if (jsonNode.isArray()) {
+      ArrayNode arrayNode = (ArrayNode) jsonNode;
+
+      for (int i = 0; i < arrayNode.size(); i++) {
+        suffix.add(i + 1);
+        addKeys(currentPath, arrayNode.get(i), set, suffix);
+
+        if (i + 1 < arrayNode.size()) {
+          suffix.remove(arrayNode.size() - 1);
+        }
+      }
+
+    } else if (jsonNode.isValueNode()) {
+      if (currentPath.contains("-")) {
+        for (int i = 0; i < suffix.size(); i++) {
+          currentPath += "-" + suffix.get(i);
+        }
+      }
+      set.add(currentPath);
+    }
+  }
+
+  public static void findMissingKeys(Path targetPath, Set<String> originSet) {
+    if (!targetPath.toFile().exists()) return;
+    try {
+      Set<String> targetSet = new HashSet<>();
+      ObjectMapper objectMapper = new ObjectMapper();
+      JsonNode json = objectMapper.readTree(new String(Files.readAllBytes(targetPath)));
+      addKeys("", json, targetSet, new ArrayList<>());
+
+      Set<String> missingKey =
+          originSet
+              .parallelStream()
+              .filter(key -> !targetSet.contains(key))
+              .collect(Collectors.toSet());
+      if (!missingKey.isEmpty()) {
+        System.err.println("Missing Key on " + targetPath.toString());
+        System.err.println("Missing Keys: ");
+        missingKey.stream().sorted().forEach(System.err::println);
+        System.exit(1);
+      }
+    } catch (Exception e) {
+      System.err.println(targetPath.toString() + " is not json files.");
+      System.exit(1);
+    }
+  }
+}