elysia-body-limit

A lightweight body size limit plugin for Elysia.js applications that helps secure your apps by limiting request body size.

Features

• 📏 Configurable maximum body size
• 🔍 Content-Length header validation
• 🔄 Transfer-Encoding stream monitoring
• ⚡ Bun maxRequestBodySize validation
• 🛡️ Strict Content-Length mode
• 🎯 Custom error handlers

Installation

bun add elysia-body-limit

Basic Usage

import { Elysia } from "elysia";
import { bodyLimit } from "elysia-body-limit";

// Your current Elysia instance is now under protect!
const app = new Elysia()
  .use(bodyLimit({
    maxSize: "10m"
  }))
  .post("/", ({ body }) => "Body received!")
  .listen(3000);

[!NOTE] The middleware automatically validates that your maxSize is not larger than Bun's maxRequestBodySize configuration.

How It Works

1. Content-Length Check: For requests with Content-Length header, the middleware validates the size before processing
2. Transfer-Encoding Support: When bodyCheck is enabled, the middleware monitors streaming requests to enforce size limits
3. Bun Configuration Validation: Automatically warns if your limit exceeds Bun's internal maxRequestBodySize