codesnips
typescript 
import { createContext, useContext, useEffect, useMemo, useState, ReactNode } from 'react';
import { authApi, User } from './authApi';

type Status = 'loading' | 'authenticated' | 'anonymous';

interface AuthValue {

Protect React Routes with an Auth Context and a RequireAuth Wrapper

react react-router authentication
by codesnips 4 tabs
go 
package listing

import "encoding/base64"

func Encode(name string) string {
	return base64.RawURLEncoding.EncodeToString([]byte(name))

Cursor-Based Directory Listing API in Go with net/http

go pagination cursor
by codesnips 3 tabs
go 
package config

import (
	"encoding/json"
	"fmt"
	"time"

Strict JSON Config Loading in Go with DisallowUnknownFields

go json configuration
by codesnips 3 tabs
ruby 
require 'sinatra/base'
require_relative 'upload_store'

class UploadApp < Sinatra::Base
  MAX_BYTES = 50 * 1024 * 1024

Streaming Multipart File Uploads to Disk in Sinatra Without Buffering

sinatra rack file-upload
by codesnips 3 tabs
ruby 
class ImportResult
  RowError = Struct.new(:line, :messages)

  attr_reader :imported, :row_errors

  def initialize

Streaming CSV Product Import With Per-Row Validation and Error Reporting in Rails

rails csv service-object
by codesnips 3 tabs
go 
package api

import (
	"encoding/json"
	"net/http"
)

Field-Level JSON Validation Errors in Go net/http Handlers

go net-http validation
by codesnips 3 tabs
typescript 
import { Injectable, NestMiddleware, UnauthorizedException } from '@nestjs/common';
import { Request, Response, NextFunction } from 'express';
import { TenantService } from './tenant.service';

@Injectable()
export class TenantContextMiddleware implements NestMiddleware {

Bind Tenant Context Per Request in NestJS With a Custom @TenantId() Decorator

nestjs multi-tenancy decorators
by codesnips 4 tabs
ruby 
class PriceBreakdown < Struct.new(:subtotal_cents, :discount_cents, :tax_cents, keyword_init: true)
  def initialize(*)
    super
    freeze
  end

Memoizing a Pricing Breakdown as an Immutable Value Object in Rails

rails memoization value-object
by codesnips 3 tabs
rust 
use std::fmt;

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum OrderState {
    Pending,
    Paid,

Type-State Order Lifecycle Machine With Compile-Time Transition Safety in Rust

state-machine enums type-state
by codesnips 3 tabs
python 
from datetime import datetime, timedelta, timezone

from jose import jwt, JWTError
from jose.exceptions import ExpiredSignatureError

SECRET_KEY = "change-me-in-production"

FastAPI JWT Authentication with Access/Refresh Tokens and a Verification Dependency

fastapi jwt authentication
by codesnips 3 tabs
java 
package com.example.billing.config;

import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Configuration;

@Configuration

Type-Safe Spring Boot Config with @ConfigurationProperties Records and Validation

spring-boot configuration validation
by codesnips 4 tabs
java 
package com.example.orders.event;

import java.math.BigDecimal;
import java.time.Instant;

public final class OrderPlacedEvent {

Publishing Domain Events After Commit with @TransactionalEventListener in Spring Boot

spring-boot spring-events transactions
by codesnips 4 tabs