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Easy Express CRUD Generator

Simple express, mongoose based crud api generator.

Inspired by GraphQL and Strapi

Basic requirements

You should have express app ready with mongoose and body-parser setup properly.

Apart from that must read minimal setup below before using it.

Detailed Documentation and example app will be added shortly!

Breif Introduction

Query is case sensitive. All mentioned params and query stirngs are expected in lowercase.

• Normal query: /city will fetch all records with all data.
• Graphql style, Ask for data you need: Simply add variable name in params e.g /city/name/country you will get _id, name and country only. Nothing else.
• Search and filteration can be done with following query keywords. eq, ne, lt, gt, lte, gte, in, nin, contains, ncontains, containss, ncontainss Add any of the above mentioned keywords to apply filters. /city/name?name_eq=ambala will bring only the results where name is equal to ambala Rest of the keywords work as follows
  • eq: equals /city/name?name_eq=ambala
  • ne: not equals /city/name?name_ne=ambala
  • lt: lower than
  • gt: greater than
  • lte: less than or equal to
  • gte: greater than or equal to
  • in: included in an array of values /city?name_in=ambala&name_in=mumbai&name_in=banglore
  • nin: non included in an array of values /city?name_nin=ambala&name_nin=mumbai&name_nin=banglore
  • contains: search by contains /city/name?name_contains=ambala
  • ncontains: doesn't contains /city/name?name_ncontains=ambala
  • containss: search by contains Case Sensitive /city/name?name_containss=ambala
  • ncontains: doesn't contains Case Sensitive /city/name?name_ncontainss=ambala
• Sorting can be done by following query keywords. _skip, _limit, _sort, asc, desc
  • _skip: Skip n numbers of records /city/name?_skip=10
  • _limit: Ask for n numbers or records (combine with _skip for pagination) /city/name?_limit=10
  • _sort, asc, desc: Sort by a variable name asc || desc /city/name?name_sort:asc /city/name?name_sort:desc
• Populate: Our model have relation with other collections as well. We can populate very easily. There is one condition which we have to follow for connection. Library is expecting all related connections started with underscore(_). Then we can query like this /city/name/_country.name/_country.shortCode. We will get following response.
• FindById query can be make by following example: /city?_id=5d303bf55c05844dcfabf897

{
    "status": true,
    "data": [
        {
            "_id": "5d303bf55c05844dcfabf897",
            "name": "ambala",
            "_country": {
                "_id": "5d303bc65c05844dcfabf895",
                "name": "india"
            }
        }
    ],
    "count": 1
}

Minimal example

const bodyParser = require('body-parser');
const CRUD = require('easy-express-crud-generator');
const express = require('express');
const mongoose = require('mongoose');
 
// DB connection
mongoose.set('useNewUrlParser', true);
mongoose.set('useFindAndModify', false);
mongoose.set('useCreateIndex', true);
mongoose.connect('mongodb://localhost:27017/dbName', (err) => {
  if (err) throw err;
  console.log('DB connected successfully!');
});
mongoose.Promise = global.Promise;
 
// Moongoose model define
const countrySchema = new mongoose.Schema({
  name: String,
  shortCode: String,
}, { timestamps: true });
const CountryModel = mongoose.model('Country', countrySchema);
 
const citySchema = new mongoose.Schema({
  _country: { type: mongoose.Schema.Types.ObjectId, ref: 'Country' },
  name: String,
}, { timestamps: true });
const CityModel = mongoose.model('City', citySchema);
 
// Creating crud operations
const cityRouter = new CRUD(CityModel).getRouter(express.Router());
const countryRouter = new CRUD(CountryModel).getRouter(express.Router());
 
// Basic express app setup
const app = express();
app.use(bodyParser.json());
app.listen(3000);
 
// Custom error handler (optional)
app.use((req, res, next) => {
  req.errorHandler = (err) => {
    return res.send({ status: false, message: 'Something went wrong' });
  }
  next();
});
 
const apiRouter = express.Router();
 
apiRouter.use('/city', cityRouter);
apiRouter.use('/country', countryRouter);
 
app.use(apiRouter);

Above example will create four endpoints for every mongoose schema.

/city

• get => get one or more records, including search, filter, pagination, populate
• post => add new record
• put => update existing record and send back the updated record, _id shall be passed in body
• delete => delete one record, _id shall be passed in body

RoadMap

This is not the roboust library with lot's of functionalities. I just tried to do my best. I need your support to make it better. You can join me by forking the repo or sending your suggestions, comments etc.

• Write documentation/how-to guide
• Add an example app
• Write test cases
• Error handling
• Swtich to typescript

I really hope my these small efforts may bring some help in your project.

Thank you 🙏

Best Wishes