feat: publish 2026 FastAPI + Google Gemini Structured JSON Architecture Blueprint

FastAPI-Gemini-2026-Architecture-Blueprint.md

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+# ⚡ FastAPI + Google Gemini Structured JSON Architecture Blueprint (2026 Cheat Sheet)
+
+Thank you for downloading the **2026 FastAPI + Google Gemini Architecture Blueprint**!
+
+> 🚀 **Want the complete, ready-to-run codebase (FastAPI + JWT/Bcrypt + Gemini Engine + Streamlit Executive Dashboard + 7/7 Smoke Tests + Docker)?**
+> Grab **ShipAI Pro Complete** here with **20% OFF** using code **`LAUNCH20`**:
+> 👉 **[https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20](https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20)**
+
+---
+
+## 1. The Golden Rule of LLM Micro-SaaS in 2026: Never Parse Raw Markdown
+
+Most AI wrappers fail in production because they ask the LLM for "JSON" in a prompt and then attempt to strip markdown code fences (` ```json `) with regular expressions.
+
+Instead, combine **`google-genai`'s native `response_mime_type="application/json"`** with **Pydantic v2 strict validation** and a **3-model failover chain**:
+
+```python
+import os, json
+from typing import List
+from pydantic import BaseModel
+from google import genai
+
+class AIStructuredResponse(BaseModel):
+    status: str
+    summary: str
+    key_points: List[str]
+    action_items: List[str]
+
+client = genai.Client(api_key=os.getenv("GEMINI_API_KEY"))
+
+DEFAULT_MODELS = [
+    os.getenv("GEMINI_MODEL", "gemini-3.5-flash"),
+    "gemini-flash-lite-latest",
+    "gemini-3.8-flash",
+]
+
+def run_structured_agent(prompt: str, context: str = "N/A") -> AIStructuredResponse:
+    system_instruction = (
+        "You are a structured AI processing agent. "
+        "Analyze the input and return a JSON object containing: "
+        "'status', 'summary', 'key_points', and 'action_items'."
+    )
+    for model_name in DEFAULT_MODELS:
+        try:
+            res = client.models.generate_content(
+                model=model_name,
+                contents=f"Context: {context}\nUser Input: {prompt}",
+                config={
+                    "response_mime_type": "application/json",
+                    "system_instruction": system_instruction,
+                },
+            )
+            return AIStructuredResponse(**json.loads(res.text))
+        except Exception as err:
+            if any(code in str(err) for code in ("404", "503", "UNAVAILABLE", "NOT_FOUND")):
+                continue
+            raise
+```
+
+---
+
+## 2. Fixing the Python 3.12 / 3.13 `passlib` + `bcrypt` 72-Byte Crash
+
+When deploying `passlib[bcrypt]` on modern Python containers, `bcrypt >= 4.1.0` raises a `ValueError: password cannot be longer than 72 bytes` during passlib's internal `detect_wrap_bug` startup check.
+
+**The Fix in `requirements.txt`:**
+```txt
+passlib[bcrypt]
+bcrypt==4.0.1
+python-jose[cryptography]
+email-validator
+```
+
+---
+
+## 3. Ready to Skip 30+ Hours of Setup?
+
+Instead of wiring `/auth/register`, `/auth/login`, HS256 Bearer guards, CORS policies, Streamlit UI, smoke tests, and Docker Compose from scratch, download the complete **ShipAI Boilerplate**:
+
+- **Starter Edition ($39):** Core FastAPI + JWT Auth + Structured Gemini Engine
+- **⭐ Pro Complete Edition ($59):** Full Stack + Streamlit Executive Dashboard + Automated Test Suite
+- **Agency & Enterprise Edition ($99):** Unlimited Client Projects + Docker Compose + Cloud Deployment Playbook
+
+👉 **[Upgrade to ShipAI Now (20% Off with code LAUNCH20)](https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20)**

README.md

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+---
+license: mit
+library_name: google-genai
+pipeline_tag: text-generation
+tags:
+  - fastapi
+  - gemini
+  - google-genai
+  - pydantic
+  - structured-output
+  - json-schema
+  - micro-saas
+  - python
+  - streamlit
+  - ai-agents
+---
+
+# ⚡ FastAPI + Google Gemini 2026 Structured JSON Blueprint (Python 3.13 Ready)
+
+[![CI Passing](https://github.com/RAZIO05/fastapi-gemini-2026-blueprint/actions/workflows/ci.yml/badge.svg)](https://github.com/RAZIO05/fastapi-gemini-2026-blueprint/actions)
+[![Python 3.10-3.13](https://img.shields.io/badge/Python-3.10--3.13-blue.svg)](https://yahiaoui26.gumroad.com/l/fastapi-gemini-blueprint)
+[![FastAPI](https://img.shields.io/badge/FastAPI-Async-009688.svg)](https://yahiaoui26.gumroad.com/l/shipai-pro)
+[![Google Gemini](https://img.shields.io/badge/Google%20Gemini-3.5%20Flash%20JSON-orange.svg)](https://yahiaoui26.gumroad.com/l/shipai-pro)
+[![ShipAI Pro](https://img.shields.io/badge/ShipAI%20v2.0-Commercial%20SaaS%20Engine-brightgreen.svg)](https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20)
+
+<p align="center">
+  <a href="https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20">
+    <img src="https://public-files.gumroad.com/00b6jvp3mssqjd59jm1ax12xa5q9" alt="ShipAI v2.0 — FastAPI + Google Gemini Commercial Micro-SaaS Engine" width="100%" />
+  </a>
+</p>
+
+> **Stop fighting unstructured LLM markdown and Python 3.13 `bcrypt` crashes.**
+> This reference blueprint shows how to wire **FastAPI**, **Pydantic v2**, and the official **`google-genai` SDK** with native `response_mime_type="application/json"` and 3-model automatic failover.
+
+---
+
+## 🎁 Grab the Free 2026 Architecture Cheat Sheet ($0) or Full Commercial Boilerplate
+
+* 📘 **[Download the Free 2026 Architecture Blueprint & Cheat Sheet ($0)](https://yahiaoui26.gumroad.com/l/fastapi-gemini-blueprint)**
+* 🚀 **[Get ShipAI v2.0 Commercial Engine (20% OFF with code `LAUNCH20`)](https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20)** — Includes:
+  * 💳 **SaaS Credit Wallet & HTTP 402 Guard** (`app/monetization.py`)
+  * 🔑 **Live Gumroad License Key Verification API** (`/api/v1/billing/activate-license`)
+  * 🎯 **5 Pre-Built Vertical Micro-SaaS Presets** (AI Startup Validator, Legal Contract Risk Auditor, OWASP Code Security Reviewer, Resume ATS Optimizer, Programmatic SEO Architect)
+  * 📊 **Streamlit v2.0 Executive Dashboard** + **Docker Compose Stack**
+  * 🛡️ **30-Day 100% Risk-Free Money-Back Guarantee**
+
+---
+
+## 1. Enforcing Strict Pydantic v2 JSON with 3-Model Gemini Failover
+
+```python
+import os, json
+from google import genai
+from pydantic import BaseModel
+from typing import List
+
+client = genai.Client(api_key=os.getenv("GEMINI_API_KEY"))
+
+DEFAULT_MODELS = [
+    os.getenv("GEMINI_MODEL", "gemini-3.5-flash"),
+    "gemini-flash-lite-latest",
+    "gemini-3.8-flash",
+]
+
+class AIStructuredResponse(BaseModel):
+    status: str
+    summary: str
+    key_points: List[str]
+    action_items: List[str]
+
+def generate_structured_json(prompt: str, system_instruction: str) -> AIStructuredResponse:
+    for model_name in DEFAULT_MODELS:
+        try:
+            res = client.models.generate_content(
+                model=model_name,
+                contents=prompt,
+                config={
+                    "response_mime_type": "application/json",
+                    "system_instruction": system_instruction,
+                },
+            )
+            return AIStructuredResponse(**json.loads(res.text))
+        except Exception as err:
+            if any(code in str(err) for code in ("404", "503", "UNAVAILABLE", "NOT_FOUND")):
+                continue
+            raise
+```
+
+## 2. Fixing the Python 3.12 / 3.13 `passlib[bcrypt]` 72-Byte Startup Crash
+
+Pin `bcrypt==4.0.1` alongside `passlib[bcrypt]` in `requirements.txt` to avoid the `ValueError: password cannot be longer than 72 bytes` exception during container boot:
+
+```txt
+fastapi
+uvicorn
+google-genai
+pydantic[email]
+passlib[bcrypt]
+bcrypt==4.0.1
+python-jose[cryptography]
+```
+
+---
+
+## 🚀 Want the Complete Production Micro-SaaS Repository?
+
+Skip 35+ hours of wiring JWT auth, SaaS credit quotas, Gumroad license verification, Streamlit UI, automated tests, and Docker Compose:
+
+👉 **[Explore the Live Interactive Demo & Get ShipAI v2.0 on Gumroad](https://yahiaoui26.gumroad.com/l/shipai-pro/LAUNCH20)**

blueprint_demo.py

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+"""FastAPI + Google Gemini 2026 Structured JSON Architecture Demo (Lite Edition).
+
+Want the complete Commercial SaaS Engine with:
+- SaaS User Credit Wallet & HTTP 402 Guard (app/monetization.py)
+- Live Gumroad License Key Verification API (/api/v1/billing/activate-license)
+- 5 Ready-to-Sell Vertical Micro-SaaS Presets (app/presets.py)
+- HS256 JWT + Bcrypt 4.0.1 Auth (app/auth.py)
+- Streamlit v2.0 Executive Dashboard & Docker Compose Stack
+
+👉 Get ShipAI v2.0 Pro (30% OFF Cloner Secret): https://yahiaoui26.gumroad.com/l/shipai-pro/BLUEPRINT30
+📘 Free Architecture Cheat Sheet ($0): https://yahiaoui26.gumroad.com/l/fastapi-gemini-blueprint
+"""
+import os
+import json
+from typing import List, Optional
+from fastapi import FastAPI, HTTPException
+from pydantic import BaseModel, Field
+from google import genai
+from dotenv import load_dotenv
+
+load_dotenv()
+
+STARTUP_BANNER = """
+\033[96m================================================================================
+⚡ ShipAI 2026 Blueprint — FastAPI + Google Gemini Structured JSON Engine
+================================================================================\033[0m
+\033[92m🎁 Git Cloner Secret Bonus (30% OFF Full Commercial SaaS Engine):\033[0m
+   👉 https://yahiaoui26.gumroad.com/l/shipai-pro/BLUEPRINT30  (Code: BLUEPRINT30)
+
+\033[93m📘 Grab the Free 2026 Architecture Cheat Sheet ($0):\033[0m
+   👉 https://yahiaoui26.gumroad.com/l/fastapi-gemini-blueprint
+\033[96m================================================================================\033[0m
+"""
+print(STARTUP_BANNER)
+
+app = FastAPI(
+    title="ShipAI Lite — FastAPI + Gemini Structured JSON Blueprint",
+    description="Open-source reference architecture. Upgrade to ShipAI v2.0 Pro for SaaS Credit Billing, JWT Auth, 5 Vertical Presets & Streamlit UI: https://yahiaoui26.gumroad.com/l/shipai-pro/BLUEPRINT30",
+    version="2.0.0-lite",
+)
+
+DEFAULT_MODELS = [
+    os.getenv("GEMINI_MODEL", "gemini-3.5-flash"),
+    "gemini-flash-lite-latest",
+    "gemini-3.8-flash",
+]
+
+
+class PromptPayload(BaseModel):
+    prompt: str = Field(..., example="Analyze the market potential of AI Micro-SaaS in 2026.")
+    context: Optional[str] = Field("US & MENA B2B SaaS market", description="Optional context")
+
+
+class StructuredAIOutput(BaseModel):
+    status: str
+    summary: str
+    key_points: List[str]
+    action_items: List[str]
+
+
+@app.get("/")
+def root():
+    return {
+        "engine": "ShipAI Lite Blueprint (2026)",
+        "docs": "/docs",
+        "cloner_30_percent_discount": "https://yahiaoui26.gumroad.com/l/shipai-pro/BLUEPRINT30",
+        "free_cheat_sheet": "https://yahiaoui26.gumroad.com/l/fastapi-gemini-blueprint",
+    }
+
+
+@app.post("/demo/structured-json", response_model=StructuredAIOutput)
+def generate_structured_json(payload: PromptPayload):
+    api_key = os.getenv("GEMINI_API_KEY")
+    if not api_key:
+        raise HTTPException(status_code=500, detail="Missing GEMINI_API_KEY in .env")
+
+    client = genai.Client(api_key=api_key)
+    system_instruction = (
+        "You are a structured AI processing agent. Return a strict JSON object with: "
+        "'status' ('success'), 'summary' (short string), 'key_points' (list of strings), "
+        "and 'action_items' (list of strings)."
+    )
+
+    last_err = None
+    for model_name in DEFAULT_MODELS:
+        try:
+            res = client.models.generate_content(
+                model=model_name,
+                contents=f"Context: {payload.context}\nInput: {payload.prompt}",
+                config={
+                    "response_mime_type": "application/json",
+                    "system_instruction": system_instruction,
+                },
+            )
+            return StructuredAIOutput(**json.loads(res.text))
+        except Exception as err:
+            last_err = err
+            if any(code in str(err) for code in ("404", "503", "UNAVAILABLE", "NOT_FOUND")):
+                continue
+            raise HTTPException(status_code=500, detail=str(err))
+    raise HTTPException(status_code=500, detail=str(last_err))