diff --git a/binding/javascript/ReadMe.md b/binding/javascript/ReadMe.md
new file mode 100644
index 0000000..e69de29
diff --git a/binding/javascript/ip2region.js b/binding/javascript/ip2region.js
new file mode 100644
index 0000000..6d9d115
--- /dev/null
+++ b/binding/javascript/ip2region.js
@@ -0,0 +1,7 @@
+// Copyright 2022 The Ip2Region Authors. All rights reserved.
+// Use of this source code is governed by a Apache2.0-style
+// license that can be found in the LICENSE file.
+
+// ip2region.js
+// @Author Lion <chenxin619315@gmail.com>
+
diff --git a/binding/javascript/package.json b/binding/javascript/package.json
index e665ea8..e1335f7 100644
--- a/binding/javascript/package.json
+++ b/binding/javascript/package.json
@@ -1,8 +1,9 @@
 {
   "name": "ip2region",
   "version": "3.0.0",
-  "description": "javascript (ES6) binding for ip2region with both IPv4 and IPv6 supported ",
-  "main": "index.js",
+  "description": "javascript binding for ip2region with both IPv4 and IPv6 supported ",
+  "type": "module",
+  "main": "ip2region.js",
   "scripts": {
     "test": "jest"
   },
@@ -13,10 +14,20 @@
   "keywords": [
     "ip2region",
     "ip-address",
-    "ip-lookup",
+    "ip-region",
     "ip-location",
+    "ip-lookup",
+    "ip-search",
+    "ipv4-address",
+    "ipv4-region",
+    "ipv4-location",
     "ipv4-lookup",
-    "ipv6-lookup"
+    "ipv4-search",
+    "ipv6-address",
+    "ipv6-region",
+    "ipv6-location",
+    "ipv6-lookup",
+    "ipv6-search"
   ],
   "author": "lionsoul2014",
   "license": "ISC",
diff --git a/binding/javascript/searcher.js b/binding/javascript/searcher.js
index f5435da..601ec1a 100644
--- a/binding/javascript/searcher.js
+++ b/binding/javascript/searcher.js
@@ -8,7 +8,8 @@
 const fs = require('fs');
 const {
     parseIP, 
-    HeaderInfoLength, VectorIndexCols, VectorIndexSize
+    HeaderInfoLength, VectorIndexCols, VectorIndexSize,
+    ipToString
 } = require('./util');
 
 class Searcher {
@@ -30,17 +31,13 @@ class Searcher {
         return this.ioCount;
     }
 
-    async search(ip) {
-        let ipBytes;
-        if (Buffer.isBuffer(ip)) {
-            ipBytes = ip;
-        } else {
-            ipBytes = parseIP(ip);
-        }
+    search(ip) {
+        // check and parse the string ip
+        const ipBytes = Buffer.isBuffer(ip) ? ip : parseIP(ip);
 
         // ip version check
         if (ipBytes.length != this.version.bytes) {
-            throw new Error(`invalid ip address (${this.version.name} expected)`);
+            throw new Error(`invalid ip address '${ipToString(ipBytes)}' (${this.version.name} expected)`);
         }
 
         // reset the global counter
@@ -48,14 +45,14 @@ class Searcher {
 
         // located the segment index block based on the vector index
         let sPtr = 0, ePtr = 0;
-        let il0 = ipBytes[0] & 0xFF, il1 = ipBytes[1] & 0xFF;
+        let il0 = ipBytes[0], il1 = ipBytes[1];
         let idx = il0 * VectorIndexCols * VectorIndexSize + il1 * VectorIndexSize;
         if (this.vectorIndex != null) {
             sPtr = this.vectorIndex.readUint32LE(idx);
             ePtr = this.vectorIndex.readUint32LE(idx + 4);
         } else if (this.cBuffer != null) {
-            sPtr = this.vectorIndex.readUint32LE(HeaderInfoLength + idx);
-            ePtr = this.vectorIndex.readUint32LE(HeaderInfoLength + idx + 4);
+            sPtr = this.cBuffer.readUint32LE(HeaderInfoLength + idx);
+            ePtr = this.cBuffer.readUint32LE(HeaderInfoLength + idx + 4);
         } else {
             const buff = Buffer.alloc(VectorIndexSize);
             this.read(HeaderInfoLength + idx, buff);
@@ -67,7 +64,7 @@ class Searcher {
         // binary search the segment index block to get the region info
         const bytes = ipBytes.length, dBytes = ipBytes.length << 1;
         const indexSize = this.version.indexSize;
-        let buff = Buffer.alloc(indexSize);
+        const buff = Buffer.alloc(indexSize);
         let dLen = -1, dPtr = -1, l = 0, h = (ePtr - sPtr) / indexSize;
         while (l <= h) {
             const m = (l + h) >> 1;
@@ -77,7 +74,7 @@ class Searcher {
             this.read(p, buff);
             if (this.version.ipSubCompare(ipBytes, buff, 0) < 0) {
                 h = m - 1;
-            } else if (this.version.ipSubCompare(ip, buff, bytes) > 0) {
+            } else if (this.version.ipSubCompare(ipBytes, buff, bytes) > 0) {
                 l = m + 1;
             } else {
                 dLen = buff.readUint16LE(dBytes);
@@ -87,12 +84,6 @@ class Searcher {
         }
 
         // console.log(`dLen: ${dLen}, dPtr: ${dPtr}`);
-        // empty match interception
-        // @Note: could this even be a case ?
-        if (dPtr < 0) {
-            return null;
-        }
-
         const region = Buffer.alloc(dLen);
         this.read(dPtr, region);
         return region.toString('utf-8');
diff --git a/binding/javascript/tests/buffer.test.js b/binding/javascript/tests/buffer.test.js
index f63a1ac..ac8aab0 100644
--- a/binding/javascript/tests/buffer.test.js
+++ b/binding/javascript/tests/buffer.test.js
@@ -5,7 +5,7 @@
 // util test script
 // @Author Lion <chenxin619315@gmail.com>
 
-const util = require('../util');
+const util = require('../util.js');
 const path = require('path');
 
 const dbPath = path.join(__dirname, '..', '..', '..', 'data', 'ip2region_v4.xdb')
diff --git a/binding/javascript/tests/ip.test.js b/binding/javascript/tests/ip.test.js
index 2479e7f..2598ae8 100644
--- a/binding/javascript/tests/ip.test.js
+++ b/binding/javascript/tests/ip.test.js
@@ -5,7 +5,7 @@
 // util test script
 // @Author Lion <chenxin619315@gmail.com>
 
-const util = require('../util');
+const util = require('../util.js');
 
 test('parse ip address', () => {
     let ip_list = [
diff --git a/binding/javascript/tests/search.test.js b/binding/javascript/tests/search.test.js
new file mode 100644
index 0000000..4b0c84b
--- /dev/null
+++ b/binding/javascript/tests/search.test.js
@@ -0,0 +1,56 @@
+// Copyright 2022 The Ip2Region Authors. All rights reserved.
+// Use of this source code is governed by a Apache2.0-style
+// license that can be found in the LICENSE file.
+
+// searcher search tester
+// @Author Lion <chenxin619315@gmail.com>
+
+const {IPv4, IPv6, parseIP, ipToString} = require('../util');
+const {newWithFileOnly} = require('../searcher');
+const path = require('path');
+
+const dbPath = {
+    v4: path.join(__dirname, '..', '..', '..', 'data', 'ip2region_v4.xdb'),
+    v6: path.join(__dirname, '..', '..', '..', 'data', 'ip2region_v6.xdb')
+}
+
+test('ipv4 search test', () => {
+    try {
+        let searcher = newWithFileOnly(IPv4, dbPath.v4);
+        let ip_list  = [
+            '1.0.0.0',
+            parseIP('113.118.112.93'),
+            '240e:3b7::'
+        ];
+
+        for (var i = 0; i < ip_list.length; i++) {
+            let ip = ip_list[i];
+            let region = searcher.search(ip);
+            let ipStr = Buffer.isBuffer(ip) ? ipToString(ip) : ip;
+            console.log(`search(${ipStr}): {region: ${region}, ioCount: ${searcher.getIOCount()}}`);
+        }
+    } catch (e) {
+        console.log(`${e.message}`);
+    }
+});
+
+test('ipv6 search test', async () => {
+    try {
+        let searcher = newWithFileOnly(IPv6, dbPath.v6);
+        let ip_list  = [
+            '2a02:26f7:c409:4001::',
+            parseIP('2a11:8080:200::a:a05c'),
+            '240e:3b7::',
+            '120.229.45.92'
+        ];
+
+        for (var i = 0; i < ip_list.length; i++) {
+            let ip = ip_list[i];
+            let region = searcher.search(ip);
+            let ipStr = Buffer.isBuffer(ip) ? ipToString(ip) : ip;
+            console.log(`search(${ipStr}): {region: ${region}, ioCount: ${searcher.getIOCount()}}`);
+        }
+    } catch (e) {
+        console.log(`${e.message}`);
+    }
+});
\ No newline at end of file
diff --git a/binding/javascript/tests/searcher.test.js b/binding/javascript/tests/searcher.test.js
index 869dba6..b762190 100644
--- a/binding/javascript/tests/searcher.test.js
+++ b/binding/javascript/tests/searcher.test.js
@@ -2,11 +2,11 @@
 // Use of this source code is governed by a Apache2.0-style
 // license that can be found in the LICENSE file.
 
-// searcher tester
+// searcher new tester
 // @Author Lion <chenxin619315@gmail.com>
 
-const {IPv4, parseIP, ipToString} = require('../util');
-const {newWithFileOnly} = require('../searcher');
+const {IPv4, IPv6, loadVectorIndexFromFile, XdbIPv4Id, loadContentFromFile} = require('../util');
+const {newWithFileOnly, newWithVectorIndex, newWithBuffer} = require('../searcher');
 const path = require('path');
 
 const dbPath = {
@@ -14,22 +14,53 @@ const dbPath = {
     v6: path.join(__dirname, '..', '..', '..', 'data', 'ip2region_v6.xdb')
 }
 
-test('ipv4 searcher test', async () => {
-    try {
-        let searcher = newWithFileOnly(IPv4, dbPath.v4);
-        let ip_list  = [
-            '1.0.0.0',
-            parseIP('113.118.112.93'),
-            '240e:3b7::'
-        ];
+function _get_creater_list(version) {
+    let dbFile = version.id == XdbIPv4Id ? dbPath.v4 : dbPath.v6;
+     return [function(){
+        return ["newWithFileOnly", newWithFileOnly(version, dbFile)];
+    }, function(){
+        const vIndex = loadVectorIndexFromFile(dbFile);
+        return ["newWithVectorIndex", newWithVectorIndex(version, dbFile, vIndex)];
+    }, function(){
+        const cBuffer = loadContentFromFile(dbFile);
+        return ["newWithBuffer", newWithBuffer(version, cBuffer)];
+    }];
+}
 
-        for (var i = 0; i < ip_list.length; i++) {
-            let ip = ip_list[i];
-            let region = await searcher.search(ip);
-            let ipStr = Buffer.isBuffer(ip) ? ipToString(ip) : ip;
-            console.log(`search(${ipStr}): {region: ${region}, ioCount: ${searcher.getIOCount()}}`);
+test('ipv4 searcher test', () => {
+    const ip_Str = '120.229.45.92';
+    const c_list = _get_creater_list(IPv4);
+    try {
+        let bRegion = null;
+        for (var i = 0; i < c_list.length; i++) {
+            const meta = c_list[i]();
+            const region = meta[1].search(ip_Str);
+            if (bRegion != null) {
+                expect(region).toBe(region);
+            }
+            bRegion = region;
+            console.log(`${meta[0]}.search(${ip_Str}): ${region}`);
         }
     } catch (e) {
-        console.log(`${e.message}`);
+        console.error(`${e.message}`);
+    }
+});
+
+test('ipv6 searcher test', async () => {
+    const ip_Str = '240e:57f:32ff:ffff:ffff:ffff:ffff:ffff';
+    const c_list = _get_creater_list(IPv6);
+    try {
+        let bRegion = null;
+        for (var i = 0; i < c_list.length; i++) {
+            const meta = c_list[i]();
+            const region = meta[1].search(ip_Str);
+            if (bRegion != null) {
+                expect(region).toBe(region);
+            }
+            bRegion = region;
+            console.log(`${meta[0]}.search(${ip_Str}): ${region}`);
+        }
+    } catch (e) {
+        console.error(`${e.message}`);
     }
 });
\ No newline at end of file
diff --git a/binding/javascript/util.js b/binding/javascript/util.js
index 4633ac0..d4a4abb 100644
--- a/binding/javascript/util.js
+++ b/binding/javascript/util.js
@@ -47,87 +47,6 @@ class Header {
 
 // ---
 
-class Version {
-    constructor(id, name, bytes, indexSize, ipCompareFunc) {
-        this.id = id;
-        this.name = name;
-        this.bytes = bytes;
-        this.indexSize = indexSize;
-        this.ipCompareFunc = ipCompareFunc;
-    }
-
-    ipCompare(ip1, ip2) {
-        return this.ipCompareFunc(ip1, ip2, 0);
-    }
-
-    ipSubCompare(ip1, ip2, offset) {
-        return this.ipCompareFunc(ip1, ip2, offset);
-    }
-
-    toString() {
-        return `{"id": ${this.id}, "name": "${this.name}", "bytes":${this.bytes}, "index_size": ${this.indexSize}}`;
-    }
-}
-
-// 14 = 4 + 4 + 2 + 4
-const IPv4 = new Version(XdbIPv4Id, "IPv4", 4, 14, function(ip1, buff, offset){
-    // ip1: Big endian byte order parsed from input
-    // ip2: Little endian byte order read from xdb index.
-    // @Note: to compatible with the old Litten endian index encode implementation.
-    let i, j = offset + ip1.length - 1;
-    for (i = 0; i < ip1.length; i++, j--) {
-        const i1 = ip1[i] & 0xFF;
-        const i2 = buff[j] & 0xFF;
-        if (i1 < i2) {
-            return -1;
-        }
-
-        if (i1 > i2) {
-            return 1;
-        }
-    }
-
-    return 0;
-});
-
-// 38 = 16 + 16 + 2 + 4
-const IPv6 = new Version(XdbIPv6Id, "IPv6", 6, 38, ipSubCompare);
-
-function versionFromName(name) {
-    let n = name.toUpperCase();
-    if (n == "V4" || n == "IPV4") {
-        return IPv4;
-    } else if (n == "V6" || n == "IPV6") {
-        return IPv6;
-    } else {
-        return null;
-    }
-}
-
-function versionFromHeader(h) {
-    let v = h.version();
-
-    // old structure with ONLY IPv4 supporting
-    if (v == XdbStructure20) {
-        return IPv4;
-    }
-
-    // structure 3.0 with IPv6 supporting
-    if (v != XdbStructure30) {
-        return null;
-    }
-
-    let ipVer = h.ipVersion();
-    if (ipVer == XdbIPv4Id) {
-        return IPv4;
-    } else if (ipVer == XdbIPv6Id) {
-        return IPv6;
-    } else {
-        return null;
-    }
-}
-// ---
-
 // parse ipv4 address
 function _parse_ipv4_addr(v4String) {
     let ps = v4String.split('.', 4);
@@ -223,7 +142,7 @@ function parseIP(ipString) {
     } else if (cDot > -1) {
         return _parse_ipv6_addr(ipString);
     } else {
-        return null;
+        throw new Error(`invalid ip address '${ipString}'`);
     }
 }
 
@@ -324,6 +243,90 @@ function ipCompare(ip1, ip2) {
     return ipSubCompare(ip1, ip2, 0);
 }
 
+// ---
+
+class Version {
+    constructor(id, name, bytes, indexSize, ipCompareFunc) {
+        this.id = id;
+        this.name = name;
+        this.bytes = bytes;
+        this.indexSize = indexSize;
+        this.ipCompareFunc = ipCompareFunc;
+    }
+
+    ipCompare(ip1, ip2) {
+        return this.ipCompareFunc(ip1, ip2, 0);
+    }
+
+    ipSubCompare(ip1, ip2, offset) {
+        return this.ipCompareFunc(ip1, ip2, offset);
+    }
+
+    toString() {
+        return `{"id": ${this.id}, "name": "${this.name}", "bytes":${this.bytes}, "index_size": ${this.indexSize}}`;
+    }
+}
+
+// 14 = 4 + 4 + 2 + 4
+const IPv4 = new Version(XdbIPv4Id, "IPv4", 4, 14, function(ip1, buff, offset){
+    // ip1: Big endian byte order parsed from input
+    // ip2: Little endian byte order read from xdb index.
+    // @Note: to compatible with the old Litten endian index encode implementation.
+    let i, j = offset + ip1.length - 1;
+    for (i = 0; i < ip1.length; i++, j--) {
+        const i1 = ip1[i] & 0xFF;
+        const i2 = buff[j] & 0xFF;
+        if (i1 < i2) {
+            return -1;
+        }
+
+        if (i1 > i2) {
+            return 1;
+        }
+    }
+
+    return 0;
+});
+
+// 38 = 16 + 16 + 2 + 4
+const IPv6 = new Version(XdbIPv6Id, "IPv6", 16, 38, ipSubCompare);
+
+function versionFromName(name) {
+    let n = name.toUpperCase();
+    if (n == "V4" || n == "IPV4") {
+        return IPv4;
+    } else if (n == "V6" || n == "IPV6") {
+        return IPv6;
+    } else {
+        return null;
+    }
+}
+
+function versionFromHeader(h) {
+    let v = h.version();
+
+    // old structure with ONLY IPv4 supporting
+    if (v == XdbStructure20) {
+        return IPv4;
+    }
+
+    // structure 3.0 with IPv6 supporting
+    if (v != XdbStructure30) {
+        return null;
+    }
+
+    let ipVer = h.ipVersion();
+    if (ipVer == XdbIPv4Id) {
+        return IPv4;
+    } else if (ipVer == XdbIPv6Id) {
+        return IPv6;
+    } else {
+        return null;
+    }
+}
+
+// ---
+
 function loadHeader(fd) {
     const buffer = Buffer.alloc(HeaderInfoLength);
     const rBytes = fs.readSync(fd, buffer, 0, HeaderInfoLength, 0);