Version 0.1

JsonViewer.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="PLUGIN_MODULE" version="4">
+  <component name="DevKit.ModuleBuildProperties" url="file://$MODULE_DIR$/resources/META-INF/plugin.xml" />
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

resources/META-INF/plugin.xml

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+<idea-plugin version="2">
+  <id>com.your.company.unique.plugin.id</id>
+  <name>JSON Viewer</name>
+  <version>0.1</version>
+  <vendor email="potterhsu0818@gmail.com" url="https://github.com/potterhsu">Potter Hsu</vendor>
+
+  <description><![CDATA[
+      JetBrains IDE plugin for viewing formatted JSON text on tool window.
+    ]]></description>
+
+  <change-notes><![CDATA[
+      Version 0.1
+    ]]>
+  </change-notes>
+
+  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/build_number_ranges.html for description -->
+  <idea-version since-build="141.0"/>
+
+  <!-- please see http://www.jetbrains.org/intellij/sdk/docs/basics/getting_started/plugin_compatibility.html
+       on how to target different products -->
+  <!-- uncomment to enable plugin in all products
+  <depends>com.intellij.modules.lang</depends>
+  -->
+
+  <extensions defaultExtensionNs="com.intellij">
+    <toolWindow id="JsonViewer" anchor="right" factoryClass="JsonViewerToolWindow" />
+  </extensions>
+
+  <actions>
+    <!-- Add your actions here -->
+  </actions>
+
+</idea-plugin>

src/JsonFormatter.java

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+/**
+ * Created by Potter Hsu on 5/3/17.
+ */
+public class JsonFormatter {
+
+    private static final int INDENT_SPACE = 2;
+
+    public String format(String text) {
+        StringBuilder formattedText = new StringBuilder();
+
+        int indentCount = 0;
+
+        for (char c : text.replaceAll("(\\s|\\n)", "").toCharArray()) {
+            if (c == '[' || c == '{') {
+                formattedText.append(c);
+                formattedText.append('\n');
+                indentCount += 1;
+                appendIndent(formattedText, indentCount);
+            }
+            else if (c == ',') {
+                formattedText.append(c);
+                formattedText.append('\n');
+                appendIndent(formattedText, indentCount);
+            }
+            else if (c == ']' || c == '}') {
+                formattedText.append('\n');
+                indentCount -= 1;
+                appendIndent(formattedText, indentCount);
+                formattedText.append(c);
+            }
+            else {
+                formattedText.append(c);
+            }
+        }
+
+        return formattedText.toString();
+    }
+
+    private void appendIndent(StringBuilder text, int indentCount) {
+        for (int i = 0; i < indentCount * INDENT_SPACE; ++i) {
+            text.append(' ');
+        }
+    }
+
+}

src/JsonFormatterTest.groovy

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+/**
+ * Created by Potter Hsu on 5/3/17.
+ */
+class JsonFormatterTest extends GroovyTestCase {
+
+    private JsonFormatter jsonFormatter;
+
+    void setUp() {
+        super.setUp()
+        jsonFormatter = new JsonFormatter();
+    }
+
+    void tearDown() {
+
+    }
+
+    void testFormat() {
+        String text = "{\"version\":\"1.0\",\"data\":{\"sampleArray\":[\"string value\",5,{\"name\":\"sub object\"}]}}";
+
+        String formattedText = jsonFormatter.format(text);
+        println(formattedText);
+
+        String formattedFormattedText = jsonFormatter.format(formattedText);
+        println(formattedFormattedText);
+    }
+
+}

src/JsonViewerToolWindow.form

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+<?xml version="1.0" encoding="UTF-8"?>
+<form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="JsonViewerToolWindow">
+  <grid id="27dc6" binding="toolWindowContent" layout-manager="GridLayoutManager" row-count="2" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+    <margin top="0" left="0" bottom="0" right="0"/>
+    <constraints>
+      <xy x="20" y="20" width="500" height="400"/>
+    </constraints>
+    <properties/>
+    <border type="none"/>
+    <children>
+      <component id="e0562" class="javax.swing.JButton" binding="buttonFormat">
+        <constraints>
+          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="3" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties>
+          <text value="Format"/>
+        </properties>
+      </component>
+      <scrollpane id="4bec0">
+        <constraints>
+          <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="7" hsize-policy="7" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="2e04" class="javax.swing.JTextArea" binding="textArea">
+            <constraints/>
+            <properties/>
+          </component>
+        </children>
+      </scrollpane>
+    </children>
+  </grid>
+</form>

src/JsonViewerToolWindow.java

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+import com.intellij.openapi.project.Project;
+import com.intellij.openapi.wm.ToolWindow;
+import com.intellij.openapi.wm.ToolWindowFactory;
+import com.intellij.ui.content.Content;
+import com.intellij.ui.content.ContentFactory;
+import org.jetbrains.annotations.NotNull;
+
+import javax.swing.*;
+
+/**
+ * Created by Potter Hsu on 5/3/17.
+ */
+public class JsonViewerToolWindow implements ToolWindowFactory {
+
+    private JPanel toolWindowContent;
+    private JButton buttonFormat;
+    private JTextArea textArea;
+
+    private JsonFormatter jsonFormatter = new JsonFormatter();
+
+    public JsonViewerToolWindow() {
+        buttonFormat.addActionListener(e -> {
+            String text = textArea.getText();
+            String formattedText = jsonFormatter.format(text);
+            textArea.setText(formattedText);
+        });
+    }
+
+    @Override
+    public void createToolWindowContent(@NotNull Project project, @NotNull ToolWindow toolWindow) {
+        ContentFactory contentFactory = ContentFactory.SERVICE.getInstance();
+        Content content = contentFactory.createContent(toolWindowContent, "", false);
+        toolWindow.getContentManager().addContent(content);
+    }
+}