Express.js Profanity Filter

Drop in as Express middleware so every request body is screened before it hits your route handlers.

Quick start in Express.js

export async function moderate(req, res, next) {
  const r = await fetch("https://api.theprofanityapi.com/v1/check", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${process.env.PROFANITY_API_KEY}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ text: req.body.text, context: "comment", mode: "balanced" }),
  });
  const { flagged } = await r.json();
  if (flagged) return res.status(422).json({ error: "Content flagged" });
  next();
}

app.post("/comments", moderate, (req, res) => { /* save */ });

Why context-aware matters

A plain word list flags "this game is sick" or medical text full of anatomical terms. The Profanity API runs a five-layer pipeline that scores intent, so "die" in a gaming taunt and "die" in a real threat are handled differently. Pick a context and the engine adjusts strictness automatically.

Other integrations

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