🚀 GG-Express

GG-Express is an Express.js wrapper that enforces strong type requirements for GET, POST, PUT, and DELETE methods. It ensures that req.query and req.body follow strict structure definitions and automatically generates an apiConnector class file for easy use in front-end development. 🎉🎉🎉

✨ Features

• Strict Type Enforcement: Ensures that req.query and req.body follow the declared types.
• Auto-Generated API Connector: Automatically creates a static API class for strongly-typed parameters.
• Seamless Front-End Integration: Simplifies the connection between the back-end and front-end by enforcing consistency.

🔑 Key Points

• Strict Parameter Enforcement: GG-Express ensures only the declared parameters are accessible in req.body or req.query.
• Type-Safe Responses: Ensures that the backend responds with a structure that matches front-end expectations.
• API Connector Generation: It automatically generates a type-safe API connector class file for the front-end.

🛠 Installation

npm install gg-express

🧑‍💻 Use Case in Backend

import express from "express"
import GGExpress from "gg-express"
const app = express()

// Initialize GG-Express with backend and frontend file paths
const ggapp = new GGExpress(app, [
  "./server/output-path-for-apiConnector.ts", // Path to generate apiConnector.ts backend file
  "./myapp/output-path-for-apiConnector.ts", // Path to generate apiConnector.ts frontend file
])

// Example of a POST request with enforced parameters
ggapp.post(
  "/api/item",
  {
    requireParams: {
      parameter: { lotNumber: "number" },
      dataType: "arrayObject",
      structure: {
        id: "number",
        name: "string",
        price: "number",
      },
    },
    responseStructure: {
      parameter: { numberOfPeople: "number", itemName: "string" },
      dataType: "arrayObject",
      structure: {
        id: "number",
        name: "string",
      },
    },
  },
  (req, res, next) => {
    // Access only the required parameters declared above
    const data = req.body.data

    // Response structure follows the predefined format
    return res.json({
      message: "",
      status: "SUCCESS",
      data: [],
      parameter: {
        itemName: "",
        numberOfPeople: 2,
      },
    })
  }
)

// Start the server and generate the API files
app.listen(3000, () => {
  ggapp.generateAPIFiles() // Generates the apiConnector class for front-end use
})

📲 Use Case in Frontend • The apiConnector.ts file will be automatically generated by the GGExpress class you configured in the backend

import GGApi from "apiConnector.ts"

const api = new GGApi()
const response = await api.post("/api/item", {
  parameter: {
    lotNumber: 2,
  },
  data: [
    {
      id: 1032,
      name: "machete",
      price: 4599,
    },
  ],
})
console.log(response.data)
// Expected data structure:
//  parameter: { numberOfPeople: number, itemName: string },
//       structure: {
//         id: number,
//         name: string,
//       }[],
// }

🔑 Keywords

• Express.js
• TypeScript
• API wrapper
• Type-safe API
• Backend-frontend integration