diff --git a/.gitignore b/.gitignore
index 50d8b98..fa410ff 100644
--- a/.gitignore
+++ b/.gitignore
@@ -62,4 +62,8 @@ typings/
 
 tmp
 
-.DS_Store
\ No newline at end of file
+.DS_Store
+
+package-lock.json
+
+*.r1cs 
diff --git a/c/tester.js b/c/tester.js
index 99c6269..0c39dfc 100644
--- a/c/tester.js
+++ b/c/tester.js
@@ -206,6 +206,54 @@ class CTester {
         }
         return lines.join("\n");
     }
+    async getOutput(witness, outputs) {
+        const outputs_iter = parse(outputs); 
+        const self = this;
+        if (!self.symbols) await self.loadSymbols();
+        // new a dictionary which map [name] to [value]
+        let res = {};
+        for (let n of outputs_iter) {
+            let v;
+            // prefix n with "main."
+            let tmp_n = "main." + n;
+            if (witness[self.symbols[tmp_n].varIdx] !== undefined) {
+                v = witness[self.symbols[tmp_n].varIdx].toString();
+            } else {
+                assert(false, "Output variable not defined: " + n);
+            }
+            // add {name: value} to the dictionary
+            res[n] = v;
+        }
+        // parse "a, b[3]" to "a, b[0], b[1], b[2]"
+        function parse(inputArray) {
+            const outputArray = [];
+            for (const item of inputArray) {
+                // Check if the item matches the pattern with brackets and a number
+                const match = item.match(/^(.+)\[(\d+)\]$/);
+                if (match) {
+                    // If there's a match, expand the item
+                    const base = match[1]; // The base string (e.g., "b" or "d")
+                    const count = parseInt(match[2], 10); // The number inside the brackets
+                    // Range all the element in the array, then add the expanded items to the output array
+                    for (let i = 0; i < count; i++) {
+                        // Check for nested brackets
+                        if (base.includes("[")) {
+                            assert(false, "Multi-dimension array is not supported");
+                        } else {
+                            // Otherwise, just add the expanded items to the output array
+                            outputArray.push(`${base}[${i}]`);
+                        }
+                    }
+                } else {
+                    // If there's no match, add the item as it is a singla varialbe 
+                    outputArray.push(item);
+                }
+            }
+        
+            return outputArray;
+        }
+        return res; 
+      }
 
     async checkConstraints(witness) {
         const self = this;
diff --git a/wasm/tester.js b/wasm/tester.js
index 8e19877..dea34d1 100644
--- a/wasm/tester.js
+++ b/wasm/tester.js
@@ -7,6 +7,7 @@ const path = require("path");
 
 const util = require("util");
 const {F1Field} = require("ffjavascript");
+const { c } = require("..");
 const exec = util.promisify(require("child_process").exec);
 
 const readR1cs = require("r1csfile").readR1cs;
@@ -178,7 +179,7 @@ class WasmTester {
         if (!self.symbols) await self.loadSymbols();
         for (let n in self.symbols) {
             let v;
-            if (utils.isDefined(witness[self.symbols[n].varIdx])) {
+            if (witness[self.symbols[n].varIdx] !== undefined) {
                 v = witness[self.symbols[n].varIdx].toString();
             } else {
                 v = "undefined";
@@ -187,6 +188,54 @@ class WasmTester {
         }
         return lines.join("\n");
     }
+    async getOutput(witness, outputs) {
+        const outputs_iter = parse(outputs); 
+        const self = this;
+        if (!self.symbols) await self.loadSymbols();
+        // new a dictionary which map [name] to [value]
+        let res = {};
+        for (let n of outputs_iter) {
+            let v;
+            // prefix n with "main."
+            let tmp_n = "main." + n;
+            if (witness[self.symbols[tmp_n].varIdx] !== undefined) {
+                v = witness[self.symbols[tmp_n].varIdx].toString();
+            } else {
+                assert(false, "Output variable not defined: " + n);
+            }
+            // add {name: value} to the dictionary
+            res[n] = v;
+        }
+        // parse "a, b[3]" to "a, b[0], b[1], b[2]"
+        function parse(inputArray) {
+            const outputArray = [];
+            for (const item of inputArray) {
+                // Check if the item matches the pattern with brackets and a number
+                const match = item.match(/^(.+)\[(\d+)\]$/);
+                if (match) {
+                    // If there's a match, expand the item
+                    const base = match[1]; // The base string (e.g., "b" or "d")
+                    const count = parseInt(match[2], 10); // The number inside the brackets
+                    // Range all the element in the array, then add the expanded items to the output array
+                    for (let i = 0; i < count; i++) {
+                        // Check for nested brackets
+                        if (base.includes("[")) {
+                            assert(false, "Multi-dimension array is not supported");
+                        } else {
+                            // Otherwise, just add the expanded items to the output array
+                            outputArray.push(`${base}[${i}]`);
+                        }
+                    }
+                } else {
+                    // If there's no match, add the item as it is a singla varialbe 
+                    outputArray.push(item);
+                }
+            }
+        
+            return outputArray;
+        }
+        return res; 
+      }
 
     async checkConstraints(witness) {
         const self = this;