# convex-http-actions

Adds HTTP endpoints in convex/http.ts: webhook receivers with signature checks, REST routes, CORS, streaming and file uploads.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · 2700 installs · ★ 405
- Author: waynesutton
- License: Apache-2.0 · policy=mirror · the beginning of the file is at the end of this page
- Source: https://github.com/waynesutton/builder-skills/tree/HEAD/skills/convex-http-actions/SKILL.md
- Updated: 2026-09-28
- HTML: https://affpapa.org/en/nevibecode/skills/convex-http-actions

## What it does

The skill covers how public HTTP endpoints work in Convex. They are served from the deployment's `.convex.site` domain, not `.convex.cloud`. One rule runs through all of it: an `httpAction` handler treats every byte of the request as untrusted, verifies it, then calls `internal.*` functions with `ctx.runQuery` or `ctx.runMutation`. It never touches `ctx.db` directly.

The router has to live in `convex/http.ts` and be the default export. A router in any other file is ignored. Inside a handler you get `ctx.runQuery`, `ctx.runMutation`, `ctx.runAction`, `ctx.storage`, `ctx.scheduler` and `ctx.auth`. Arguments still pass through the target function's validators, so a bad shape fails there with a clear error.

For webhooks, read the raw body once with `request.text()`. Parsing first changes the bytes and breaks the signature. Providers retry on any non-2xx response, so the same event arrives more than once — deduplicate by event id inside the mutation, which is a transaction. The webhook secret comes from an environment variable; without it the handler returns 500. Request and response bodies are capped at 20MB.

## Requirements
- Works with: Stripe

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex-http-actions -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/convex-http-actions/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/convex-http-actions/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex-http-actions -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/convex-http-actions/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex-http-actions -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/convex-http-actions/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install waynesutton/builder-skills convex-http-actions
```

2. **Manually: put the files in place**
- File: `.github/skills/convex-http-actions/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex-http-actions -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/waynesutton/builder-skills --path skills/convex-http-actions
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/convex-http-actions/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add waynesutton/builder-skills --skill convex-http-actions -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/waynesutton/builder-skills/tree/HEAD/skills/convex-http-actions/SKILL.md

## When to use it
- receive a Stripe webhook and verify its signature
- expose a plain HTTP API to a client without the Convex SDK
- stream bytes to a browser without going through useQuery
- upload a file over HTTP instead of an upload URL
- stop the same event from being processed twice

## Example prompts
- add a Stripe webhook route in convex/http.ts with signature verification
- create a POST /api/items route that writes through an internalMutation
- deduplicate webhook events by eventId in the webhookEvents table

## Source text · SKILL.md · Apache-2.0

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BEGIN THIRD-PARTY FILE bb63d26bc8aa7d0b
````text
---
name: convex-http-actions
description: Adds HTTP endpoints in convex/http.ts: webhook receivers with signature checks, REST style routes, CORS, auth headers, streaming responses, and file uploads over HTTP. Use when integrating Stripe, Clerk, Resend, or any service that calls back into the app, or when a client needs a plain HTTP API.
---

# Convex HTTP actions

Defines public HTTP endpoints served from the deployment's `.convex.site` domain. The one rule: an `httpAction` handler treats every byte of the request as untrusted, verifies it, then calls `internal.*` functions with `ctx.runQuery` or `ctx.runMutation`. It never reads or writes `ctx.db` directly.

## When to reach for this

- A third party (Stripe, Clerk, Resend, GitHub) needs a URL to POST events to
- A client without the Convex SDK (mobile app, CLI, another backend) needs a plain HTTP API
- A browser needs to download or stream bytes without going through `useQuery`
- A script or form needs to upload bytes over HTTP instead of an upload URL

## httpAction or mutation

| Caller | Use |
| --- | --- |
| Your own React or Next.js app using `convex/react` | `query` and `mutation`. Skip HTTP actions. |
| External service sending webhooks | `httpAction` |
| Client that cannot use the Convex SDK | `httpAction` |
| Scheduled or internal work | `internalMutation` or `internalAction` |

HTTP actions get no argument validators and no automatic auth. They run in the default Convex runtime, so Web APIs (`fetch`, `crypto.subtle`, `Response`, `ReadableStream`) work without `"use node"`. Request and response bodies are capped at 20MB.

## Router skeleton

The router must live at `convex/http.ts` and be the default export. A router in any other file is ignored.

```typescript
// convex/http.ts
import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";
import { internal } from "./_generated/api";

const http = httpRouter();

http.route({
  path: "/api/items",
  method: "POST",
  handler: httpAction(async (ctx, request) => {
    let body: { name?: unknown };
    try {
      body = await request.json();
    } catch {
      return json({ error: "Invalid JSON body" }, 400);
    }
    if (typeof body.name !== "string") {
      return json({ error: "name is required" }, 400);
    }
    const id = await ctx.runMutation(internal.items.create, { name: body.name });
    return json({ id }, 201);
  }),
});

export default http;
````
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First 2442 of 10254 bytes. © waynesutton · Apache-2.0 · https://github.com/waynesutton/builder-skills/tree/HEAD/skills/convex-http-actions/SKILL.md

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