diff --git a/src/index.ts b/src/index.ts
index 3aea9ca..e31d500 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,11 +1,12 @@
 import { Hono } from "hono";
 import { ApiResponse } from "./modules/api_response";
 import { validator } from "hono/validator";
-import { postJson } from "./service/postJson";
+import { postUser } from "./service/postUser";
 import { isEmpty } from "./utils/is_empty";
-import { get } from "./service/get";
+import { getUser } from "./service/getUser";
 import { cors } from "hono/cors";
 import { bodyLimit } from "hono/body-limit";
+import { getRandom } from "./service/getRandom";
 
 const tmpApp: Hono = new Hono()
 export const app = tmpApp.basePath("/test/")
@@ -13,7 +14,7 @@ app.use("/test/*", cors())
 
 // routers
 app.get("/user", (c) => {
-    const re = get()
+    const re = getUser()
     return c.json(ApiResponse.success(200, "Get user successfully", re))
 })
 
@@ -27,7 +28,7 @@ app.post(
         return val
     }),
     c => {
-        const re = postJson()
+        const re = postUser()
         return c.json(ApiResponse.success(200, "Add successfully", re))
     }
 )
@@ -95,6 +96,19 @@ app.post("/file",
     }
 )
 
+app.get("/random",
+    validator("query", (val, c) => {
+        if (isEmpty(val.typeList, val.length)) {
+            c.status(400)
+            return c.json(ApiResponse.err(400, "Param is invalid"))
+        }
+        return val
+    }),
+    c => {
+        return getRandom(c)
+    }
+)
+
 app.notFound((c) => {
     console.log(`Not found [${c.req.method}]: ${c.req.path}`);
     return c.json(ApiResponse.err(404, "Not Found"))
diff --git a/src/service/getRandom.ts b/src/service/getRandom.ts
new file mode 100644
index 0000000..2761ebc
--- /dev/null
+++ b/src/service/getRandom.ts
@@ -0,0 +1,53 @@
+import type { Context } from "hono"
+import { ApiResponse } from "../modules/api_response"
+import { Random } from "../utils/random"
+
+export function getRandom(c: Context) {
+    const typeInReq = c.req.query("typeList")
+    const lenTmp = c.req.query("length")
+    let len: number
+    if (typeInReq == "") {
+        c.status(400)
+        return c.json(ApiResponse.err(400, "Param is invalid"))
+    }
+    let typeList: string[]
+    try {
+        typeList = JSON.parse(typeInReq!.toString())
+    } catch (e) {
+        c.status(400)
+        return c.json(ApiResponse.err(400, "Syntax error in parameter[typeList]"))
+    }
+    if (typeList.length == 0) {
+        c.status(400)
+        return c.json(ApiResponse.err(400, "Array is empty in parameter[typeList]"))
+    }
+
+    if (isNaN((Number(lenTmp)))) {
+        c.status(400)
+        return c.json(ApiResponse.err(400, "Parameter[length] must be a number"))
+    } else {
+        len = Number(lenTmp)
+        if (len <= 0) {
+            c.status(400)
+            return c.json(ApiResponse.err(400, "Parameter[length] must > 0"))
+        }
+    }
+
+    let result
+    try {
+        result = new Random(typeList, len).get()
+    } catch (e) {
+        if (e instanceof Error) {
+            c.status(400)
+            return c.json(ApiResponse.err(400, e.message))
+        } else {
+            console.log("Unexcepted error");
+        }
+    }
+
+    if (result != undefined) {
+        return c.json(ApiResponse.success(200, "ok", result))
+    } else {
+        return c.json(ApiResponse.err(500, "Unexcepted error"))
+    }
+}
\ No newline at end of file
diff --git a/src/utils/random.ts b/src/utils/random.ts
new file mode 100644
index 0000000..c816dab
--- /dev/null
+++ b/src/utils/random.ts
@@ -0,0 +1,77 @@
+import type { Context, ContextVariableMap } from "hono"
+import { updateExpressionWithTypeArguments } from "typescript/unstable/ast/factory"
+import { ApiResponse } from "../modules/api_response"
+
+enum Type {
+    lcLetter = "lcLetter",
+    ucLetter = "ucLetter",
+    number = "number",
+    specialChar = "specialChar"
+}
+
+export class Random {
+    typeList: string[]
+    len: number
+    lowerCaseLetterList: string[] = ((): string[] => {
+        return [...Array(26)].map((_, i) => String.fromCharCode(i + 97))
+    })()
+    upperCaseLetterList: string[] = ((): string[] => {
+        return [...Array(26)].map((_, i) => String.fromCharCode(i + 65))
+    })()
+    numberList: string[] = ((): string[] => {
+        return [...Array(10)].map((_, i) => String.fromCharCode(i + 48))
+    })()
+    specialCharList = Array.from(`!@#$%^&*()_+-=[]{}|;':",./<>?`)
+    all: string[] = []
+
+    constructor(typeList: string[], len: number) {
+        this.typeList = typeList
+        this.len = len
+        if (
+            !(this.typeList.length == 1 &&
+                this.typeList[0] === "all")
+        ) {
+            for (let i = 0; i < this.typeList.length; i++) {
+                switch (this.typeList[i]) {
+                    case Type.lcLetter:
+                        this.all = [...this.all, ...this.lowerCaseLetterList]
+                        break
+                    case Type.ucLetter:
+                        this.all = [...this.all, ...this.upperCaseLetterList]
+                        break
+                    case Type.number:
+                        this.all = [...this.all, ...this.numberList]
+                        break
+                    case Type.specialChar:
+                        this.all = [...this.all, ...this.specialCharList]
+                        break
+                    default:
+                        throw new Error(
+                            `At least contains "all"|"${Type.lcLetter}"|"${Type.ucLetter}"|"${Type.number}"|"${Type.specialChar}" in parameter[typeList]`
+                        );
+                }
+            }
+        } else {
+            this.all = [
+                ...this.lowerCaseLetterList,
+                ...this.upperCaseLetterList,
+                ...this.numberList,
+                ...this.specialCharList
+            ]
+        }
+
+    }
+
+    get(): string {
+        let resultArr: string[] = []
+        for (let i = 0; i < this.len; i++) {
+            const randomNumber = Math.floor(Math.random() * this.all.length)
+            resultArr = [...resultArr, this.all[randomNumber]!]
+        }
+        let result = ""
+        resultArr.map((val, _) => {
+            result += val
+        })
+        return result
+    }
+}
\ No newline at end of file