🤖
Expressで作ったLINE BotをVercelでデプロイする方法
Expressで作ったLINE BotをVercelでデプロイする方法を紹介します。
事前準備
- LINE Developersにアカウント作成・ログイン
- プロバイダー作成
- チャンネルを作成
- アクセストークン・チャンネルシークレットを取得
その他の細かい設定は他の記事を参考にしてください。
環境構築
フォルダを作成してVSCodeで開く
mkdir line-bot-sample
code line-bot-sample
初期化とパッケージインストール
npm init -y
npm i express @line/bot-sdk
npm i -D @types/express @types/node nodemon ts-dotenv ts-node-dev
npx tsc --init
package.jsonを編集
{
"name": "line-bot-sample",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
+ "build": "npx tsc",
+ "build:watch": "npx tsc --watch",
+ "start": "node dist/index.js",
+ "start:dev": "nodemon dist/index.js",
+ "dev": "ts-node-dev --respawn src/index.ts",
"test": "echo \"Error: no test specified\" && exit 1"
},
"keywords": [],
"author": "",
"license": "ISC",
"dependencies": {
"@line/bot-sdk": "^8.2.0",
"express": "^4.18.2"
},
"devDependencies": {
"@types/express": "^4.17.21",
"@types/node": "^20.10.6",
"nodemon": "^3.0.2",
"ts-dotenv": "^0.9.1",
"ts-node-dev": "^2.0.0"
}
}
tsconfig.jsonを編集
{
"compilerOptions": {
/* Visit https://aka.ms/tsconfig to read more about this file */
/* Projects */
// "incremental": true, /* Save .tsbuildinfo files to allow for incremental compilation of projects. */
// "composite": true, /* Enable constraints that allow a TypeScript project to be used with project references. */
// "tsBuildInfoFile": "./.tsbuildinfo", /* Specify the path to .tsbuildinfo incremental compilation file. */
// "disableSourceOfProjectReferenceRedirect": true, /* Disable preferring source files instead of declaration files when referencing composite projects. */
// "disableSolutionSearching": true, /* Opt a project out of multi-project reference checking when editing. */
// "disableReferencedProjectLoad": true, /* Reduce the number of projects loaded automatically by TypeScript. */
/* Language and Environment */
"target": "es2016", /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */
// "lib": [], /* Specify a set of bundled library declaration files that describe the target runtime environment. */
// "jsx": "preserve", /* Specify what JSX code is generated. */
// "experimentalDecorators": true, /* Enable experimental support for legacy experimental decorators. */
// "emitDecoratorMetadata": true, /* Emit design-type metadata for decorated declarations in source files. */
// "jsxFactory": "", /* Specify the JSX factory function used when targeting React JSX emit, e.g. 'React.createElement' or 'h'. */
// "jsxFragmentFactory": "", /* Specify the JSX Fragment reference used for fragments when targeting React JSX emit e.g. 'React.Fragment' or 'Fragment'. */
// "jsxImportSource": "", /* Specify module specifier used to import the JSX factory functions when using 'jsx: react-jsx*'. */
// "reactNamespace": "", /* Specify the object invoked for 'createElement'. This only applies when targeting 'react' JSX emit. */
// "noLib": true, /* Disable including any library files, including the default lib.d.ts. */
// "useDefineForClassFields": true, /* Emit ECMAScript-standard-compliant class fields. */
// "moduleDetection": "auto", /* Control what method is used to detect module-format JS files. */
/* Modules */
"module": "commonjs", /* Specify what module code is generated. */
// "rootDir": "./", /* Specify the root folder within your source files. */
// "moduleResolution": "node10", /* Specify how TypeScript looks up a file from a given module specifier. */
// "baseUrl": "./", /* Specify the base directory to resolve non-relative module names. */
// "paths": {}, /* Specify a set of entries that re-map imports to additional lookup locations. */
// "rootDirs": [], /* Allow multiple folders to be treated as one when resolving modules. */
// "typeRoots": [], /* Specify multiple folders that act like './node_modules/@types'. */
// "types": [], /* Specify type package names to be included without being referenced in a source file. */
// "allowUmdGlobalAccess": true, /* Allow accessing UMD globals from modules. */
// "moduleSuffixes": [], /* List of file name suffixes to search when resolving a module. */
// "allowImportingTsExtensions": true, /* Allow imports to include TypeScript file extensions. Requires '--moduleResolution bundler' and either '--noEmit' or '--emitDeclarationOnly' to be set. */
// "resolvePackageJsonExports": true, /* Use the package.json 'exports' field when resolving package imports. */
// "resolvePackageJsonImports": true, /* Use the package.json 'imports' field when resolving imports. */
// "customConditions": [], /* Conditions to set in addition to the resolver-specific defaults when resolving imports. */
// "resolveJsonModule": true, /* Enable importing .json files. */
// "allowArbitraryExtensions": true, /* Enable importing files with any extension, provided a declaration file is present. */
// "noResolve": true, /* Disallow 'import's, 'require's or '<reference>'s from expanding the number of files TypeScript should add to a project. */
/* JavaScript Support */
// "allowJs": true, /* Allow JavaScript files to be a part of your program. Use the 'checkJS' option to get errors from these files. */
// "checkJs": true, /* Enable error reporting in type-checked JavaScript files. */
// "maxNodeModuleJsDepth": 1, /* Specify the maximum folder depth used for checking JavaScript files from 'node_modules'. Only applicable with 'allowJs'. */
/* Emit */
// "declaration": true, /* Generate .d.ts files from TypeScript and JavaScript files in your project. */
// "declarationMap": true, /* Create sourcemaps for d.ts files. */
// "emitDeclarationOnly": true, /* Only output d.ts files and not JavaScript files. */
// "sourceMap": true, /* Create source map files for emitted JavaScript files. */
// "inlineSourceMap": true, /* Include sourcemap files inside the emitted JavaScript. */
// "outFile": "./", /* Specify a file that bundles all outputs into one JavaScript file. If 'declaration' is true, also designates a file that bundles all .d.ts output. */
+ "outDir": "./dist", /* Specify an output folder for all emitted files. */
- // "outDir": "./", /* Specify an output folder for all emitted files. */
// "removeComments": true, /* Disable emitting comments. */
// "noEmit": true, /* Disable emitting files from a compilation. */
// "importHelpers": true, /* Allow importing helper functions from tslib once per project, instead of including them per-file. */
// "importsNotUsedAsValues": "remove", /* Specify emit/checking behavior for imports that are only used for types. */
// "downlevelIteration": true, /* Emit more compliant, but verbose and less performant JavaScript for iteration. */
// "sourceRoot": "", /* Specify the root path for debuggers to find the reference source code. */
// "mapRoot": "", /* Specify the location where debugger should locate map files instead of generated locations. */
// "inlineSources": true, /* Include source code in the sourcemaps inside the emitted JavaScript. */
// "emitBOM": true, /* Emit a UTF-8 Byte Order Mark (BOM) in the beginning of output files. */
// "newLine": "crlf", /* Set the newline character for emitting files. */
// "stripInternal": true, /* Disable emitting declarations that have '@internal' in their JSDoc comments. */
// "noEmitHelpers": true, /* Disable generating custom helper functions like '__extends' in compiled output. */
// "noEmitOnError": true, /* Disable emitting files if any type checking errors are reported. */
// "preserveConstEnums": true, /* Disable erasing 'const enum' declarations in generated code. */
// "declarationDir": "./", /* Specify the output directory for generated declaration files. */
// "preserveValueImports": true, /* Preserve unused imported values in the JavaScript output that would otherwise be removed. */
/* Interop Constraints */
// "isolatedModules": true, /* Ensure that each file can be safely transpiled without relying on other imports. */
// "verbatimModuleSyntax": true, /* Do not transform or elide any imports or exports not marked as type-only, ensuring they are written in the output file's format based on the 'module' setting. */
// "allowSyntheticDefaultImports": true, /* Allow 'import x from y' when a module doesn't have a default export. */
"esModuleInterop": true, /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */
// "preserveSymlinks": true, /* Disable resolving symlinks to their realpath. This correlates to the same flag in node. */
"forceConsistentCasingInFileNames": true, /* Ensure that casing is correct in imports. */
/* Type Checking */
"strict": true, /* Enable all strict type-checking options. */
// "noImplicitAny": true, /* Enable error reporting for expressions and declarations with an implied 'any' type. */
// "strictNullChecks": true, /* When type checking, take into account 'null' and 'undefined'. */
// "strictFunctionTypes": true, /* When assigning functions, check to ensure parameters and the return values are subtype-compatible. */
// "strictBindCallApply": true, /* Check that the arguments for 'bind', 'call', and 'apply' methods match the original function. */
// "strictPropertyInitialization": true, /* Check for class properties that are declared but not set in the constructor. */
// "noImplicitThis": true, /* Enable error reporting when 'this' is given the type 'any'. */
// "useUnknownInCatchVariables": true, /* Default catch clause variables as 'unknown' instead of 'any'. */
// "alwaysStrict": true, /* Ensure 'use strict' is always emitted. */
// "noUnusedLocals": true, /* Enable error reporting when local variables aren't read. */
// "noUnusedParameters": true, /* Raise an error when a function parameter isn't read. */
// "exactOptionalPropertyTypes": true, /* Interpret optional property types as written, rather than adding 'undefined'. */
// "noImplicitReturns": true, /* Enable error reporting for codepaths that do not explicitly return in a function. */
// "noFallthroughCasesInSwitch": true, /* Enable error reporting for fallthrough cases in switch statements. */
// "noUncheckedIndexedAccess": true, /* Add 'undefined' to a type when accessed using an index. */
// "noImplicitOverride": true, /* Ensure overriding members in derived classes are marked with an override modifier. */
// "noPropertyAccessFromIndexSignature": true, /* Enforces using indexed accessors for keys declared using an indexed type. */
// "allowUnusedLabels": true, /* Disable error reporting for unused labels. */
// "allowUnreachableCode": true, /* Disable error reporting for unreachable code. */
/* Completeness */
// "skipDefaultLibCheck": true, /* Skip type checking .d.ts files that are included with TypeScript. */
"skipLibCheck": true /* Skip type checking all .d.ts files. */
}
}
.envと.gitignoreと/src/index.tsを作成してください。
mkdir src
touch src/index.ts .env
.env
.DS_Store
node_modules
*.jpeg
*.png
PORT=9000 # ポート
CHANNEL_ACCESS_TOKEN= # アクセストークンを貼り付ける
CHANNEL_SECRET= # チャンネルシークレットを貼り付ける
実装
src/index.tsを以下のように編集
import {
middleware,
MiddlewareConfig,
WebhookEvent,
TextMessage,
MessageAPIResponseBase,
} from "@line/bot-sdk";
import {
MessagingApiClient,
} from "@line/bot-sdk/dist/messaging-api/api";
import express, { Application, Request, Response } from "express";
import { load } from "ts-dotenv";
const env = load({
CHANNEL_ACCESS_TOKEN: String,
CHANNEL_SECRET: String,
PORT: Number,
});
const PORT = env.PORT || 3000;
const config = {
channelAccessToken: env.CHANNEL_ACCESS_TOKEN || "",
channelSecret: env.CHANNEL_SECRET || "",
};
const middlewareConfig: MiddlewareConfig = config;
const client = new MessagingApiClient({
channelAccessToken: env.CHANNEL_ACCESS_TOKEN || "",
});
const app: Application = express();
app.get("/", async (_: Request, res: Response): Promise<Response> => {
return res.status(200).send({
message: "success",
});
});
const textEventHandler = async (
event: WebhookEvent
): Promise<MessageAPIResponseBase | undefined> => {
if (event.type !== "message" || event.message.type !== "text") {
return;
}
const { replyToken } = event;
const { text } = event.message;
const resText = (() => {
switch (Math.floor(Math.random() * 3)) {
case 0:
return text.split("").reverse().join("");
case 1:
return text.split("").join(" ");
default:
return text.split("").reverse().join(" ");
}
})();
console.log(resText);
const response: TextMessage = {
type: "text",
text: resText,
};
await client.replyMessage({
replyToken: replyToken,
messages: [response],
});
};
app.post(
"/webhook",
middleware(middlewareConfig),
async (req: Request, res: Response): Promise<Response> => {
const events: WebhookEvent[] = req.body.events;
await Promise.all(
events.map(async (event: WebhookEvent) => {
try {
await textEventHandler(event);
} catch (err: unknown) {
if (err instanceof Error) {
console.error(err);
}
return res.status(500);
}
})
);
return res.status(200);
}
);
app.listen(PORT, () => {
console.log(`http://localhost:${PORT}/`);
});
実行する場合はnpm run devでサーバー起動
（※httpでは動作しないのでローカルで実行する場合はngrokを使用、https://ドメイン/webhookをWebhook URLに登録）
デプロイ
vercel.jsonをルートに作成
{
"version": 2,
"builds": [
{
"src": "dist/index.js",
"use": "@vercel/node"
}
],
"routes": [
{
"src": "/.*",
"dest": "/dist/index.js",
"methods": ["GET", "POST"]
}
]
}
npm run buildでdistフォルダにコンパイル、Vercel上ではコンパイル後のJSを実行します。
publicでGitHubに公開、Vercelにログインしてリポジトリをインポート
Vercelで環境変数に.envと同じものを設定
うまくできました
あとはWebhook URLを設定します。
Webhookの利用をONにします。
QRコードから友達追加して、試しにメッセージを送信
ちゃんと動作しました。
これでExpressで作ったLINE BotをVercelでデプロイすることができました！！
以下リポジトリです
Discussion