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A complete directory of all developer tools, tutorials, cheatsheets, and articles available on DevTools Daily.

Tool Collections

Security Tools

DevOps Tools

HTTP & API Tools

Local Data Tools

Log & Privacy Tools

Encoders

Base64 Decoder

Base64 Encoder

Base64 Image Encoder

URL Decoder

URL Encoder

JSON Escape

JSON Unescape

JSON Minify

JSON Viewer

CSV Viewer

CSV to JSON

CSV to SQL

CSV query as SQL

Formatters

CSS Formatter

HTML Formatter

Javascript Formatter

JSON Formatter

XML Formatter

SQL Formatter

Inline SQL variables

Stack Trace Formatter

Java Exception Formatter

How to

Random numbers in javascript

Random numbers in python

Random numbers in Java

Run MySQL in Docker

Run Postgres in Docker

Date and time

Stopwatch

Timer

Countries

Cron Expression Builder

Security

JWT Debugger

Hash & Checksum Generator

HMAC Generator & Verifier

Secure Password & Secret Generator

Secret Detector & Redactor

X.509 Certificate Viewer

HTTP Security Header Helper

Text Tools

Text Toolbox

Generators

Mock Data Generator

Image Tools

Image Toolkit

DevOps

.gitignore Generator

.env Toolkit

Dockerfile & Compose Generator

GitHub Actions Workflow Explainer

Log & Privacy

Log and Privacy Workbench

Data Tools

Data Explorer

Workspaces

Saved Workspaces

Recipes

Developer Recipes

Pipelines

Tool Pipelines

HTTP Tools

API Workbench

ASCII

ASCII

Box Drawing ASCII

Code Comment ASCII Art

Text to ASCII Art

ASCII tree

Tutorials

JQ Tutorial

JsonPath Tutorial

Graphviz Tutorial

SQL Interactive tutorial

How to

How to concatenate 2 fields in JSON using JQ

How to create Sequence diagram in MermaidJS

How to use Regex in JQ

Overview

Your One-Stop Shop for All Things JQ

Everything about JSON

Everything about Markdown

Everything about Regex

MermaidJS - Diagrams made easy

HTML5 canvas - Drawing made easy

Everything about SQL

Everything about Sqlite

Everything about UUID

Everything about LangChain

Articles

Announcing Our Interview Prep Platform: A Free LeetCode & NeetCode Alternative

How to Decode and Verify a JWT Safely

HMAC-SHA256 Explained with Node.js and Python Examples

HTTP Security Headers Checklist with Secure Examples

How to Redact Production Logs Before Sharing Them

Cron Expression Examples: Daily, Weekdays, Intervals and Leap Days

How to Compare Development and Production .env Files

Convert cURL to Fetch, Axios, Python, Go and Java

How to Debug CORS and Browser API Requests

Profile CSV and JSON Data Without Uploading It

GitHub Actions Security: Permissions and SHA Pinning

Building an OG Image Generator with GitHub Copilot

Save Figma site as static HTML

JQ - Handling null values and default values

Sending emails with Azure - Part 3

Sending emails with Azure - Part 2

Sending emails with Azure

Elevate your code comments with ASCII Art - 5 tips

Building gradle dependency graph using Python and GraphViz

How to use json path for json manipulations

Building a Lightweight Random JSON Generator with a Custom Vocabulary

Integrating MermaidJS with ReactJS Hooks

Graphviz layout options

Unveiling the Mock GraphQL Tool

Query and Transform JSON data with JQ

Generating MermaidJS Flow Chart Diagrams Programmatically in JavaScript

Using CodeMirror in Gatsby

New AI-powered DevTools

Advanced JQ Patterns

Using Graphviz JS in Gatsby to preview DOT

Understand the Basics of SQL Joins with Examples

Building File tree view in React and Electron

Switching from Direct calls to OpenAI to Langchain

Contact Form in Gatsby JS and Firebase realtime database

Real examples of Graphviz

ChatGPT API using python SDK example

Use react hooks to load third party library from CDN

Generating Random Text with JavaScript

Generate short UUID

Showing inline errors in codemirror

Building MermaidJS Markup programmatically in Python

Python Examples

Python Examples

Python example: dataclasses

Python example: construct dot markup

Python example: to and from JSON string

Python example: regular expressions

Python example: list comprehensions

Python example: type hints

Python example: decorators

Python example: dict comprehensions

Python example: inheritance

Python example: datetime format

Python example: f-strings

Javascript Examples

Javascript Examples

Javascript example: to and from JSON string

Javascript example: iterate over array

Javascript example: validate email using regex

Javascript example: iterate over object

GraphViz examples

GraphViz examples

Graphviz example: System Design Graphviz Example

Graphviz example: Entity Relationship Diagram Graphviz Example

Graphviz example: Workflow Diagram Graphviz Example

Graphviz example: BPMN or Business process diagram Graphviz Example

Graphviz example: Services interaction diagram Graphviz Example

Graphviz example: Database ERD Graphviz Example

Graphviz example: Family Tree Graphviz Example

Graphviz example: Subgraphs Graphviz Example

Graphviz example: Decision Tree Graphviz Example

MermaidJS examples

MermaidJS examples

MermaidJS example: System Design Diagram

MermaidJS example: Entity Relationship Diagram

MermaidJS example: Workflow Diagram

MermaidJS example: Simple Sequence Diagram

MermaidJS example: Pie Diagram

Coding Questions

Text-Based Mock Interview

All Coding Problems

Two Sum

Merge Intervals

Reverse a String

Longest Common Prefix

Palindrome String

Palindromic Substrings

Longest Palindromic Substring

Palindrome Linked List

Roman to Integer

Letter Combinations of a Phone Number

Valid Parentheses

Find the Index of the First Occurrence in a String

Length of Last Word

Spiral Matrix

FizzBuzz

Contains Duplicate

Maximum Subarray

Fibonacci Number

Factorial

Move Zeroes

Single Number

Best Time to Buy and Sell Stock

Valid Anagram

Binary Search

Count Vowels

Climbing Stairs

Product of Array Except Self

Trapping Rain Water

Edit Distance

Median of Two Sorted Arrays

Longest Valid Parentheses

Palindrome Number

Plus One

Majority Element

Is Subsequence

First Unique Character in a String

Search Insert Position

House Robber

Jump Game

Coin Change

Longest Substring Without Repeating Characters

Container With Most Water

Number of Islands

Word Break

Longest Increasing Subsequence

Largest Rectangle in Histogram

Sliding Window Maximum

Jump Game II

System Design

System Design Questions

Design a URL Shortener

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