/convex-http-actions

name: convex-http-actions
displayName: Convex HTTP Actions
description: External API integration and webhook handling including HTTP endpoint routing, request/response handling, authentication, CORS configuration, and webhook signature validation
version: 1.0.0
author: Convex
tags: [convex, http, actions, webhooks, api, endpoints]

Convex HTTP Actions

Build HTTP endpoints for webhooks, external API integrations, and custom routes in Convex applications.

Documentation Sources

Before implementing, do not assume; fetch the latest documentation:

• Primary: https://docs.convex.dev/functions/http-actions
• Actions Overview: https://docs.convex.dev/functions/actions
• Authentication: https://docs.convex.dev/auth
• For broader context: https://docs.convex.dev/llms.txt

Instructions

HTTP Actions Overview

HTTP actions allow you to define HTTP endpoints in Convex that can:

• Receive webhooks from third-party services
• Create custom API routes
• Handle file uploads
• Integrate with external services
• Serve dynamic content

Basic HTTP Router Setup

// convex/http.ts
import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";

const http = httpRouter();

// Simple GET endpoint
http.route({
  path: "/health",
  method: "GET",
  handler: httpAction(async (ctx, request) => {
    return new Response(JSON.stringify({ status: "ok" }), {
      status: 200,
      headers: { "Content-Type": "application/json" },
    });
  }),
});

export default http;

Request Handling

// convex/http.ts
import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";

const http = httpRouter();

// Handle JSON body
http.route({
  path: "/api/data",
  method: "POST",
  handler: httpAction(async (ctx, request) => {
    // Parse JSON body
    const body = await request.json();
    
    // Access headers
    const authHeader = request.headers.get("Authorization");
    
    // Access URL parameters
    const url = new URL(request.url);
    const queryParam = url.searchParams.get("filter");

    return new Response(
      JSON.stringify({ received: body, filter: queryParam }),
      {
        status: 200,
        headers: { "Content-Type": "application/json" },
      }
    );
  }),
});

// Handle form data
http.route({
  path: "/api/form",
  method: "POST",
  handler: httpAction(async (ctx, request) => {
    const formData = await request.formData();
    const name = formData.get("name");
    const email = formData.get("email");

    return new Response(
      JSON.stringify({ name, email }),
      {
        status: 200,
        headers: { "Content-Type": "application/json" },
      }
    );
  }),
});

// Handle raw bytes
http.route({
  path: "/api/upload",
  method: "POST",
  handler: httpAction(async (ctx, request) => {
    const bytes = await request.bytes();
    const contentType = request.headers.get("Content-Type") ?? "application/octet-stream";
    
    // Store in Convex storage
    const blob = new Blob([bytes], { type: contentType });
    const storageId = await ctx.storage.store(blob);

    return new Response(
      JSON.stringify({ storageId }),
      {
        status: 200,
        headers: { "Content-Type": "application/json" },
      }
    );
  }),
});

export default http;

Path Parameters

Use path prefix matching for dynamic routes:

// convex/http.ts
import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";

const http = httpRouter();

// Match /api/users/* with pathPrefix
http.route({
  pathPrefix: "/api/users/",
  method: "GET",
  handler: httpAction(async (ctx, request) => {
    const url = new URL(request.url);
    // Extract user ID from path: /api/users/123 -> "123"
    const userId = url.pathname.replace("/api/users/", "");

    return new Response(
      JSON.stringify({ userId }),
      {
        status: 200,
        headers: { "Content-Type": "application/json" },
      }
    );
  }),
});

export default http;

CORS Configuration

// convex/http.ts
import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";

const http = httpRouter();

// CORS headers helper
const corsHeaders = {
  "Access-Control-Allow-Origin": "*",
  "Access-Control-Allow-Methods": "GET, POST, PUT, DELETE, OPTIONS",
  "Access-Control-Allow-Headers": "Content-Type, Authorization",
  "Access-Control-Max-Age": "86400",
};

// Handle preflight requests
http.route({
  path: "/api/data",
  method: "OPTIONS",
  handler: httpAction(async () => {
    return new Response(null, {
      status: 204,
      headers: corsHeaders,
    });
  }),
});

// Actual endpoint with CORS
http.route({
  path: "/api/data",
  method: "POST",
  handler: httpAction(async (ctx, request) => {
    const body = await request.json();

    return new Response(
      JSON.stringify({ success: true, data: body }),
      {
        status: 200,
        headers: {
          "Content-Type": "application/json",
          ...corsHeaders,
        },
      }
    );
  }),
});

export default http;

Webhook Handling

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

const http = httpRouter();

// Stripe webhook
http.route({
  path: "/webhooks/stripe",
  method: "POST",
  handler: httpAction(async (ctx, request) => {
    const signature = request.headers.get("stripe-signature");
    if (!signature) {
      return new Response("Missing signature", { status: 400 });
    }

    const body = await request.text();

    // Verify webhook signature (in action with Node.js)
    try {
      await ctx.runAction(internal.stripe.verifyAndProcessWebhook, {
        body,
        signature,
      });
      return new Response("OK", { status: 200 });
    } catch (error) {
      console.error("Webhook error:", error);
      return