Create Bakong (KHQR) API proxy with Hono JS

When you request a check transaction to Bakong API from outside Cambodia, and you get this response:

What to do? Move the application to the Cambodia server? I don’t know!

But I have an idea! 🤔 Why don’t we create a proxy and then route the request check transaction to the hosted server in Cambodia?

Let’s set up

bun create hono@latest khqr-proxy

cd khqr-proxy

bun install

Open: src/index.ts

import { Hono } from "hono";
import { proxy } from "hono/proxy";

const app = new Hono();

// You can change the path based on your needs
app.all("*", async (c) => {
  const path = c.req.path; // if you changed path, replace this: c.req.path.replace('/proxy', '');
  const query = c.req.query();

  const baseUrl = "https://api-bakong.nbc.gov.kh";
  const url = `${baseUrl}${path}?${new URLSearchParams(query)}`;

  const headers = new Headers(c.req.header());
  headers.set("host", "api-bakong.nbc.gov.kh");

  const res = await proxy(url, {
    method: c.req.method,
    headers,
    raw: c.req.raw,
  });

  return res;
});

export default app;

Run local development:

bun run dev

Deploy

Your server needs to have Bun installed or Docker. I recommend using Docker deployment as an easy way.

If you don’t have Docker please check here: https://docs.docker.com/engine/install/ubuntu/

Dockerfile

# syntax = docker/dockerfile:1

# Adjust BUN_VERSION as desired
ARG BUN_VERSION=1.2.20
FROM oven/bun:${BUN_VERSION}-slim AS base

# Bun app lives here
WORKDIR /app

# Set production environment
ENV NODE_ENV="production"

# Throw-away build stage to reduce size of final image
FROM base AS build

# Install node modules
COPY bun.lock package.json ./
RUN bun install --ci

# Copy application code
COPY . .

# Final stage for app image
FROM base

ARG PORT=3000
ENV PORT=${PORT}

# Copy built application
COPY --from=build /app /app

# Start the server by default; this can be overwritten at runtime
EXPOSE ${PORT}
CMD [ "bun", "start" ]

docker-compose.yml

services:
  app:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - "3000:3000"
    restart: unless-stopped

Start:

docker compose up -d

Noted: if you don’t want to use Hono JS, you can use anything you want.

check repo: Here