Express

Content Moderation Middleware for Express

One middleware, every route protected.

Block unsafe requests before they reach your handlers.

What it detects

  • • POST request bodies
  • • PUT/PATCH updates
  • • File uploads via multer
  • • WebSocket message frames
  • • GraphQL mutation inputs
  • • Custom rules

Why developers choose Vettly

  • • Drop in as Express middleware
  • • Works with multer for image uploads
  • • Sub-300ms decisions
  • • Audit logs for every blocked request
Example request
bash
import express from 'express';
import { Vettly } from '@vettly/sdk';

const vettly = new Vettly({ apiKey: process.env.VETTLY_API_KEY });
const app = express();
app.use(express.json());

app.post('/messages', async (req, res) => {
  const result = await vettly.check({
    content: req.body.text,
    contentType: 'text',
    policyId: 'default',
  });
  if (result.action === 'block') return res.status(400).json({ blocked: true });
  // ...persist message
  res.json({ ok: true });
});
Example response
json
{
  "flagged": true,
  "action": "block",
  "categories": {
    "harassment": 0.93,
    "hate": 0.02
  },
  "policy": "default",
  "latency_ms": 142
}

Compared to wordlist middleware

AI categories catch novel evasions that wordlists miss, with no maintenance overhead.

Keep exploring

Content Moderation API

One endpoint for text, image, and video moderation.

Image Moderation API

Policy-driven image checks with clear allow, review, and block actions.

Video Moderation API

Async video moderation without stitching together multiple vendors.

Content Moderation in Next.js

Add content moderation to a Next.js App Router project in minutes. Server-side API routes, React Server Components, and edge runtime examples.

Get an API key

Start making decisions in minutes with a Developer plan and clear upgrade paths.

Get an API key