How to Add Image Content Moderation to Your App in 5 Minutes

Why content moderation matters

If your app accepts user-uploaded images — profile photos, chat messages, forum posts, or any user-generated content — you need content moderation. Without it, a single explicit image can damage your brand, violate app store policies, and drive away users.

Manual moderation does not scale. A moderator can review a few hundred images per day. An API can process thousands per second.

Step 1: Choose your approach

You have two options for when to moderate:

For most apps, moderating before publishing is the safer choice.

Step 2: Integrate the API

Here is how to add NSFW detection to a Node.js/Express backend:

const express = require("express");
const multer = require("multer");
const upload = multer();

const app = express();

app.post("/upload", upload.single("image"), async (req, res) => {
  // Send image to NSFW Checker API
  const formData = new FormData();
  formData.append("image", new Blob([req.file.buffer]));

  const check = await fetch("https://api.nsfwcheckers.workers.dev", {
    method: "POST",
    body: formData,
  });
  const result = await check.json();

  if (result.nsfw) {
    return res.status(400).json({ error: "Image contains inappropriate content" });
  }

  // Image is safe — save it, process it, etc.
  res.json({ success: true, message: "Image uploaded successfully" });
});

Step 3: Handle the result

The API returns a simple JSON response:

Step 4: Add to your frontend (optional)

You can also check images client-side before uploading to your server:

async function checkImage(file) {
  const fd = new FormData();
  fd.append("image", file);
  const res = await fetch("https://api.nsfwcheckers.workers.dev", {
    method: "POST",
    body: fd,
  });
  const data = await res.json();
  return data.nsfw;
}

This gives instant feedback to users and saves server bandwidth on rejected images.

Rate limits and pricing

The free tier gives you 100 requests per day — enough for development, testing, and small apps. For higher volume, Pro (5,000/day) and Business (50,000/day) plans are coming soon.

Summary

Adding content moderation to your app takes 5 minutes with the NSFW Checker API. No signup, no API key, no complex setup. Just send an image and get a result.