Code Explainers

Code explainers tagged #jwt

ruby 
module Authenticatable
  extend ActiveSupport::Concern
 
  included do

JWT authentication as a Rails concern

authentication jwt concerns
Intermediate 6 steps
java 
public final class HmacJwt {
 
    private static final ObjectMapper MAPPER = new ObjectMapper();
    private static final Base64.Encoder ENCODER = Base64.getUrlEncoder().withoutPadding();

How HMAC-signed JWTs are created and verified

jwt hmac cryptography
Intermediate 9 steps
typescript 
interface JwtPayload {
  exp?: number;
  iat?: number;
  sub?: string;

Decoding a JWT to check expiry

jwt base64url type-guards
Intermediate 8 steps
java 
@Configuration
@EnableWebSecurity
public class ResourceServerConfig {
 

Configuring a JWT resource server in Spring

oauth2 jwt authorization
Intermediate 8 steps
javascript 
const express = require('express');
const jwt = require('jsonwebtoken');
const crypto = require('crypto');
 

Refresh token rotation in Express

jwt token-rotation authentication
Advanced 9 steps
typescript 
import { Injectable, UnauthorizedException } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';
import { ConfigService } from '@nestjs/config';

How a JWT strategy authenticates in NestJS

authentication jwt passport
Intermediate 7 steps
typescript 
import { CanActivate, ExecutionContext, Injectable, UnauthorizedException } from '@nestjs/common';
import { GqlExecutionContext } from '@nestjs/graphql';
import { Reflector } from '@nestjs/core';
import { JwtService } from '@nestjs/jwt';

How a GraphQL auth guard works in NestJS

authentication authorization jwt
Intermediate 7 steps
python 
from functools import wraps
 
import jwt
from flask import current_app, g, jsonify, request

How a JWT auth decorator works in Flask

decorators authentication jwt
Intermediate 6 steps
javascript 
import { NextResponse } from 'next/server';
import { jwtVerify } from 'jose';
 
const PROTECTED_PREFIXES = ['/dashboard', '/settings', '/billing'];

Gating routes with Next.js middleware and JWTs

authentication middleware jwt
Intermediate 8 steps
rust 
use axum::{
    async_trait,
    extract::{FromRequestParts, State},
    http::{header, request::Parts, StatusCode},

Custom auth extractors in Axum

extractors authentication error-handling
Intermediate 9 steps
javascript 
function parseJwtPayload(token) {
  const parts = token.split('.');
  if (parts.length !== 3) {
    throw new Error('Invalid JWT: expected 3 segments');

Decoding a JWT payload in JavaScript

jwt base64url encoding
Intermediate 6 steps
python 
import os
from datetime import datetime, timezone
 
import jwt

JWT bearer auth as a FastAPI dependency

authentication jwt dependency-injection
Intermediate 7 steps
go 
package auth
 
import (
	"net/http"

Building a JWT auth middleware in Gin

middleware jwt authentication
Intermediate 7 steps
javascript 
import { cookies } from 'next/headers';
import { NextResponse } from 'next/server';
import { SignJWT, jwtVerify } from 'jose';
 

JWT session cookies in a Next.js Route Handler

authentication jwt cookies
Intermediate 8 steps
java 
@Component
public class JwtAuthenticationFilter extends OncePerRequestFilter {
 
    private final JwtTokenProvider tokenProvider;

How a JWT auth filter works in Spring

authentication jwt servlet-filter
Intermediate 8 steps
rust 
use axum::{
    extract::FromRequestParts,
    http::{request::Parts, StatusCode, header::AUTHORIZATION},
};

How a JWT extractor works in Axum

authentication jwt extractors
Intermediate 8 steps
php 
<?php
 
function verifyJwt(string $token, string $secret): array
{

Verifying an HS256 JWT in PHP

jwt hmac authentication
Intermediate 9 steps