Feature: Add JSON Repair operation with comprehensive malformed JSON fixing capabilities

package.json

@@ -144,6 +144,7 @@
     "json5": "^2.2.3",
     "jsonata": "^2.0.3",
     "jsonpath-plus": "^9.0.0",
+    "jsonrepair": "^3.13.0",
     "jsonwebtoken": "8.5.1",
     "jsqr": "^1.4.0",
     "jsrsasign": "^11.1.0",

src/core/config/Categories.json

@@ -465,6 +465,7 @@
             "JavaScript Minify",
             "JSON Beautify",
             "JSON Minify",
+            "JSON Repair",
             "XML Beautify",
             "XML Minify",
             "SQL Beautify",

src/core/operations/JSONRepair.mjs

@@ -0,0 +1,48 @@
+/**
+ * @author maojunxyz [maojun@linux.com]
+ * @copyright Crown Copyright 2025
+ * @license Apache-2.0
+ */
+
+import OperationError from "../errors/OperationError.mjs";
+import Operation from "../Operation.mjs";
+
+/**
+ * JSON Repair operation
+ */
+class JSONRepair extends Operation {
+
+    /**
+     * JSONRepair constructor
+     */
+    constructor() {
+        super();
+
+        this.name = "JSON Repair";
+        this.module = "Code";
+        this.description = "Attempts to repair invalid JSON by fixing common issues such as missing quotes around keys, trailing commas, single quotes, missing brackets, and more.<br><br>This operation can fix:<br>• Missing quotes around keys<br>• Single quotes instead of double quotes<br>• Trailing commas<br>• Missing commas<br>• Missing closing brackets<br>• Python constants (None, True, False)<br>• Comments<br>• JSONP notation<br>• And many other common JSON formatting issues<br><br>Uses the jsonrepair library for comprehensive JSON repair.<br><br>Tags: json fix, json repair, json validate, json format";
+        this.inputType = "string";
+        this.outputType = "string";
+        this.args = [];
+    }
+
+    /**
+     * @param {string} input
+     * @param {Object[]} args
+     * @returns {string}
+     */
+    async run(input, args) {
+        if (!input) return "";
+
+        try {
+            // Dynamic import of jsonrepair to handle potential module loading issues
+            const { jsonrepair } = await import("jsonrepair");
+            return jsonrepair(input);
+
+        } catch (err) {
+            throw new OperationError("Unable to repair JSON. The input contains errors that cannot be automatically fixed.\n" + err.message);
+        }
+    }
+}
+
+export default JSONRepair;

tests/operations/index.mjs

@@ -93,6 +93,7 @@ import "./tests/JA3SFingerprint.mjs";
 import "./tests/Jsonata.mjs";
 import "./tests/JSONBeautify.mjs";
 import "./tests/JSONMinify.mjs";
+import "./tests/JSONRepair.mjs";
 import "./tests/JSONtoCSV.mjs";
 import "./tests/Jump.mjs";
 import "./tests/JWK.mjs";

tests/operations/tests/JSONRepair.mjs

@@ -0,0 +1,175 @@
+/**
+ * JSONRepair tests.
+ *
+ * @author maojunxyz [maojun@linux.com]
+ *
+ * @copyright Crown Copyright 2025
+ * @license Apache-2.0
+ */
+import TestRegister from "../../lib/TestRegister.mjs";
+
+TestRegister.addTests([
+    {
+        name: "JSON Repair: empty string",
+        input: "",
+        expectedOutput: "",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: valid JSON unchanged",
+        input: "{\"name\": \"John\", \"age\": 30}",
+        expectedOutput: "{\"name\": \"John\", \"age\": 30}",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: missing quotes around keys",
+        input: "{name: \"John\", age: 30}",
+        expectedOutput: "{\"name\": \"John\", \"age\": 30}",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: single quotes to double quotes",
+        input: "{'name': 'John', 'age': 30}",
+        expectedOutput: "{\"name\": \"John\", \"age\": 30}",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: trailing comma in object",
+        input: "{\"name\": \"John\", \"age\": 30,}",
+        expectedOutput: "{\"name\": \"John\", \"age\": 30}",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: trailing comma in array",
+        input: "[1, 2, 3,]",
+        expectedOutput: "[1, 2, 3]",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: Python constants",
+        input: "{\"active\": True, \"data\": None, \"flag\": False}",
+        expectedOutput: "{\"active\": true, \"data\": null, \"flag\": false}",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: line comments",
+        input: `{
+    "name": "John", // This is a comment
+    "age": 30
+}`,
+        expectedOutput: `{
+    "name": "John", 
+    "age": 30
+}`,
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: block comments",
+        input: `{
+    "name": "John", /* This is a 
+    multi-line comment */
+    "age": 30
+}`,
+        expectedOutput: `{
+    "name": "John", 
+    "age": 30
+}`,
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: missing comma",
+        input: `{
+    "name": "John"
+    "age": 30,
+    "city": "Boston"
+}`,
+        expectedOutput: `{
+    "name": "John",
+    "age": 30,
+    "city": "Boston"
+}`,
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: complex mixed issues",
+        input: `{
+    name: "John",  // Person's name
+    age: 30,
+    active: True,
+    data: None,
+}`,
+        expectedOutput: `{
+    "name": "John",  
+    "age": 30,
+    "active": true,
+    "data": null
+}`,
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+    {
+        name: "JSON Repair: JSONP notation",
+        input: "callback({\"name\": \"John\", \"age\": 30})",
+        expectedOutput: "{\"name\": \"John\", \"age\": 30}",
+        recipeConfig: [
+            {
+                op: "JSON Repair",
+                args: [],
+            },
+        ],
+    },
+]);