Back4app Blog
Why Does the API Return 101, 119, 142 or 209? Every Backend Error Code, Reproduced [Full Repo]
We fired 48 requests at two live backends and caught 15 numeric error codes, each with its HTTP status, body and cause. One code, 101, covers five unrelated situations, and it is the only one that arrives as a 404.
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ContainersHow to Run a Node.js Bot, Webhook or Cron Job 24/7 Without a VPS [Full Repo]
One 75-line Node container ran a signed webhook, a cron tick and a queue worker around the clock, state in a managed backend — measured Sept 2026, no VPS.
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AI AgentHow to Build an Inventory Management System Without Writing Code
Turn your stock spreadsheet into a multi-user inventory system with logins, reorder alerts and an AI assistant — from prompts, in an afternoon. Sept 2026.
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BackendBuild and Deploy a Node.js REST API in 15 Minutes — Without Owning a Server [Full Code Inside]
The same Task API two ways: 105 lines of Express you maintain forever, or 24 lines on Back4app. Measured comparison, every command tested August 2026.
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ContainersHow to Deploy a Next.js SSR App With Docker and a Backend [Full Repo]
Deploy a server-rendered Next.js 15 app with Docker and a managed backend: per-request rendering on a container, keys never in the browser, 6-min first build.
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AI AgentHow to Build an Online Store From a Single Prompt
Describe the shop you want and get a catalogue, cart, checkout, customer accounts and an admin back office — running, with server-side pricing. Sept 2026.
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BackendHow to Add Authentication to a Web or Flutter App Without Writing an Auth Server [Full Repo]
Add signup, login, logout and password reset to a web or Flutter app with six REST calls to a managed backend and no auth server. Signup 597 ms, login 245 ms.
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ContainersHow to Deploy FastAPI With Docker and a Database, Without Managing a Server [Full Repo]
Deploy a FastAPI app with Docker and a managed database: 80 lines of Python, a 7-line Dockerfile, live behind HTTPS in 86 seconds, and the bug Pydantic missed.
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AI AgentHow to Turn a Spreadsheet Into a Web App With a Database and Login
Attach your .xlsx, describe what you need, and get a multi-user web app with a real database, Google sign-in and AI and email integrations. Sept 2026.
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ContainersHow to Deploy a Node.js App With Docker and a Database, Without Managing a Server [Full Repo]
Deploy a Node.js app with Docker and a managed database: a 42-line Express app, an 8-line Dockerfile, live behind HTTPS in 42 seconds, no server to administer.
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BackendYour Frontend Talks Straight to the Database. Here Is How to Lock It Down [Full Repo]
Twelve requests from four identities against one class, before and after class-level permissions, an owner ACL from a hook and a role. Measured Sept 2026.