Developer Tooling Platform

Build faster.
Debug smarter.

Expose databases, APIs, and local services securely. Capture, replay, and analyze HTTP traffic, catch local SMTP email, and inspect raw callbacks with a global request bin.

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6 Developer Tools

1-click REST API from JSON

Full HTTP Journal & Replay

Core Tools

Everything you need in one place

Six powerful tools designed to eliminate friction from your development and testing workflow.

API

JSON API Server

Upload a JSON document and instantly get a fully functional REST API with CRUD endpoints — no backend code required.

Paging, filtering and sorting
Edit data in-browser
Adjust latency and error rates for testing

HTTP & Webhook Tunnel

Expose your local web app and capture every incoming request with full journaling and one-click replay.

Incoming request journal
Replay and debug failed calls
Ideal for Stripe, GitHub, and webhook-driven flows

Tunnels

Developer Tunnel

Expose local databases or services to teammates with access controls. Secure collaboration without VPNs.

Supports multiple protocols
Peer access and permission controls
Provider/client workflow for secure connectivity

SQL

SQL Practice Lab

Build confidence with hands-on SQL practice in your own Northwind workspace. Try queries, learn faster, and reset anytime.

Get a personal Northwind workspace in seconds
Test ideas quickly without risking production data
Reset instantly whenever you want a fresh start

Inspect

Global Request Bin

Send any callback to one global endpoint and inspect method, headers, query parameters, form values, raw payload, and JSON instantly.

Works with GET, POST, HEAD and more
Stateless training mode for students and form practice
Personal persisted bins available in dashboard for advanced flows
Includes copy-paste curl examples

Mailbox Email Catcher

Run a local SMTP catcher with aspcodecli mail up, inspect HTML and text bodies, and download attachments without sending email to real inboxes.

Capture mail from local apps on localhost:1025
Review HTML, plain text, headers, and attachments
Great for signup, reset-password, invoice, and notification flows

Why use this?

Stop fighting your tools.
Start shipping.

Developers waste hours setting up mock APIs, re-triggering webhooks, previewing email, and configuring VPNs. This platform eliminates all of it in minutes.

Fast setup

From zero to running API or tunnel in under 60 seconds.

Secure by default

Access controls, API keys, and encrypted channels.

CLI tooling included

Ready-to-download CLI for every platform. Automate everything.

aspcodecli

$ aspcodecli serve --port 3000

✓ Tunnel active

Public URL: https://abc123.aspcode.net

→ POST /webhook 200 42ms

→ GET /api/orders 200 18ms

→ POST /webhook 404 5ms

$ aspcodecli mail up --key mail_live_42

✓ Mailbox active on localhost:1025

$ aspcodecli replay --id wh_3f9a█

Pricing

Simple, honest pricing

Start free, upgrade when you need more. No hidden fees, cancel any time.

Free

$0 / forever

2 JSON databases
1 dev tunnel
1 webhook tunnel
Mailbox email catcher included
30 req / min
64 KB max payload

Get Started Free

Browse by job to be done

These landing pages each target one intent so visitors and crawlers can move from a generic homepage into a much more specific workflow.

Feature Developer Tunnel Software Evaluate ASPCode for secure local service and database sharing workflows. Read more → Use case Share a Local Database See a focused page for provider and client collaboration around dev databases. Read more → Feature Webhook Tester Inspect inbound requests, keep a journal, and replay events after fixes. Read more → Use case Webhook Debugging Follow the capture, inspect, fix, and replay workflow for failed callbacks. Read more → Integration Stripe Webhook Testing Use a Stripe-specific page for checkout, billing, and subscription callback workflows. Read more → Integration GitHub Webhook Testing Explore repo and app webhook debugging with request capture and replay. Read more → Integration Shopify Webhook Testing Use a Shopify-specific page for order, product, and app event webhook workflows. Read more → Integration Slack Webhook Testing See a Slack-specific page for events, slash commands, and app callback debugging. Read more → Feature Email Catcher Catch local SMTP mail, inspect HTML and attachments, and verify email-driven flows faster. Read more → Use case Local Email Testing Preview signup, reset-password, invoice, and notification emails before they hit real inboxes. Read more → Feature JSON to REST API Upload JSON and publish CRUD endpoints for frontend, QA, or demo work. Read more → Use case Mock APIs for Frontend Teams See how shareable hosted mock APIs help UI teams move before backend delivery lands. Read more → Use case QA Sandbox API Give QA and staging workflows stable hosted endpoints with editable test scenarios. Read more → Use case SQL Interview Practice Use the SQL Practice Lab for hands-on interview prep and repeatable query drills. Read more → Use case Junior SQL Exercises Use a beginner-friendly SQL page for onboarding, first exercises, and guided query practice. Read more → Compare ASPCode vs ngrok Compare a platform-first developer workflow with a tunnel-first evaluation path. Read more → Compare ASPCode vs RequestBin Understand the difference between inspection-only and replay-oriented webhook tooling. Read more → Compare ASPCode vs MailHog Compare an included mailbox workflow with a dedicated local email catcher baseline. Read more → Hub Email Testing Resources Browse mailbox, local SMTP, and email-testing comparison pages in one cluster. Browse hub → Hub Full Resources Hub Browse the complete cluster of feature pages, use-case pages, email-testing content, and comparison pages. Browse hub →

Ready to ship faster?

Create your free account and get tunnels, webhook replay, hosted JSON APIs, request bins, mailbox email catching, and SQL practice in one place.

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Build faster. Debug smarter.