Virtual Try-On API in Node.js

# Node 18+ ships fetch natively. No install step needed.
node --version   # ensure v18 or later

# Optional: keep your API key out of source control
echo "PHOTTA_API_KEY=photta_live_xxxxx" >> .env

// photta.js — a 20-line wrapper you can reuse across your app.
const PHOTTA_BASE_URL = "https://ai.photta.app/api/v1";

export async function phottaFetch(path, init = {}) {
  const res = await fetch(`${PHOTTA_BASE_URL}${path}`, {
    ...init,
    headers: {
      "Authorization": `Bearer ${process.env.PHOTTA_API_KEY}`,
      "Content-Type": "application/json",
      ...init.headers,
    },
  });
  const body = await res.json();
  if (!res.ok) {
    const err = new Error(body?.error?.message ?? res.statusText);
    err.status = res.status;
    err.code = body?.error?.code;
    throw err;
  }
  return body;
}

import { phottaFetch } from "./photta.js";

// 1. Submit the job — returns a generation ID immediately.
const created = await phottaFetch("/tryon/apparel", {
  method: "POST",
  body: JSON.stringify({
    product_type: "dress",
    product_images: ["https://example.com/dress.jpg"],
    mannequin_id: "mnq_athena_ts",
    pose_id: "pose_standing_front",
    resolution: "2K",
    aspect_ratio: "3:4",
  }),
});
const generationId = created.data.id;

// 2. Poll every 3 seconds until processing completes. Typical
// completion is 1.5–4 minutes; put an upper bound so a stuck
// job can't hang your request forever.
const pollInterval = 3000;
const maxAttempts = 120;     // 120 × 3s = 6 minutes
let result;

for (let i = 0; i < maxAttempts; i++) {
  result = await phottaFetch(`/tryon/apparel/${generationId}`);
  if (result.data.status === "completed") break;
  if (result.data.status === "failed") {
    throw new Error(result.data.error_message);
  }
  await new Promise((r) => setTimeout(r, pollInterval));
}

console.log("Result:", result.data.output_url);

try {
  await phottaFetch("/tryon/apparel", {
    method: "POST",
    body: JSON.stringify({ /* … */ }),
  });
} catch (err) {
  if (err.status === 402) {
    // Out of credits — surface a top-up CTA to the user.
    // err.code === "insufficient_credits"
  } else if (err.status === 429) {
    // Rate-limited. Honour the Retry-After header.
    const retryAfter = err.retryAfter ?? 30;
    await new Promise((r) => setTimeout(r, retryAfter * 1000));
    // Then retry…
  } else if (err.status >= 500) {
    // Server-side issue — backoff + retry.
  }
  throw err;
}