Code Explainers

Code explainers tagged #query-parameters

python 
from enum import Enum
from typing import Annotated
 
from fastapi import FastAPI, Query, Request, status

Custom validation error responses in FastAPI

validation error-handling enums
Intermediate 8 steps
python 
import base64
import json
from typing import Annotated, Optional
 

Cursor pagination in a FastAPI endpoint

pagination cursor async
Intermediate 9 steps
go 
package handlers
 
import (
	"encoding/base64"

Cursor pagination in a Gin handler

pagination cursor rest-api
Intermediate 8 steps
rust 
use axum::{
    extract::Query,
    response::IntoResponse,
    Json,

Parsing query strings in Axum handlers

deserialization query-parameters defaults
Intermediate 7 steps
python 
from datetime import date, timedelta
from typing import Annotated
 
from fastapi import APIRouter, Depends, Query

Validating date ranges with FastAPI dependencies

dependency-injection validation pydantic
Intermediate 6 steps
java 
@RestController
@RequestMapping("/api/products")
public class ProductSearchController {
 

Binding collection query params in Spring

rest-api query-parameters dependency-injection
Intermediate 6 steps
java 
public URI buildSearchUri(String query, int page, int size, List<String> tags) {
    UriComponentsBuilder builder = UriComponentsBuilder
            .fromUriString("https://api.example.com")
            .path("/v2/products/search")

Building URIs safely with UriComponentsBuilder in Spring

url-building builder-pattern encoding
Intermediate 5 steps
go 
func ListArticles(db *gorm.DB) gin.HandlerFunc {
	return func(c *gin.Context) {
		page, err := strconv.Atoi(c.DefaultQuery("page", "1"))
		if err != nil || page < 1 {

Building a paginated list endpoint in Gin

pagination query-parameters input-validation
Intermediate 8 steps
javascript 
const express = require('express');
const router = express.Router();
const db = require('../db');
 

Building a paginated articles endpoint in Express

pagination input-validation async-await
Intermediate 8 steps
python 
from datetime import date
from enum import Enum
from typing import Annotated
 

Reusable query params with Pydantic in FastAPI

query-parameters validation pagination
Intermediate 8 steps
rust 
use axum::{
    extract::{Query, State},
    http::StatusCode,
    Json,

Paginated, filtered product listing in Axum

pagination query-parameters sql-filtering
Intermediate 8 steps