DevToolKit

DevToolKit provides a collection of free, browser-based developer utilities. Every tool runs entirely in your browser — no data is sent to any server, ever. Your code, tokens, and data stay private.

Whether you need to format JSON, decode a JWT token, generate a PostgreSQL config, build an Nginx configuration, create a GitLab CI pipeline, or test regular expressions — DevToolKit has you covered.

Built by developers, for developers. No sign-up required. No tracking. No ads interrupting your workflow. Bookmark it and use it every day.

Guides

PostgreSQL Performance Tuning Guide 2026 — Complete configuration reference with formulas, recommended values by server size, and best practices for shared_buffers, work_mem, and effective_cache_size.

Nginx Configuration Guide for Developers — How to set up Nginx as a reverse proxy, configure SSL with Let's Encrypt, enable gzip, add security headers, and set up load balancing.

GitLab CI/CD Pipeline Guide 2026 — Build production-ready .gitlab-ci.yml pipelines with lint, test, build, and deploy stages for any language and deployment target.

Available Tools

JSON Formatter & Validator — Format, beautify, minify, and validate JSON data online with customizable indentation.

YAML ↔ JSON Converter — Convert between YAML and JSON formats instantly. Supports nested objects, arrays, and comments.

Base64 Encoder/Decoder — Encode text to Base64 or decode Base64 strings. Full UTF-8 support.

JWT Decoder — Decode and inspect JSON Web Tokens. View header, payload, and expiration info without any server.

URL Encoder/Decoder — Encode or decode URL components and query parameters with Unicode support.

Hash Generator — Generate SHA-1, SHA-256, SHA-384, and SHA-512 hashes from any text using the Web Crypto API.

UUID Generator — Generate random UUID v4 identifiers in multiple formats.

Regex Tester — Test regular expressions in real-time with match highlighting and group extraction.

Unix Timestamp Converter — Convert Unix timestamps to human-readable dates and back.

Color Converter — Convert between HEX, RGB, and HSL color formats with a live preview.

Lorem Ipsum Generator — Generate placeholder text for your designs.

Text Diff Checker — Compare two texts side by side with highlighted differences.

Password Generator — Generate strong random passwords with customizable complexity.

QR Code Generator — Create QR codes for URLs, text, Wi-Fi, email. Download as PNG or SVG.

SQL Formatter — Format and beautify SQL queries. Supports MySQL, PostgreSQL, SQLite, BigQuery, and more.

Cron Expression Parser — Parse and generate cron expressions with human-readable descriptions and next execution times.

PostgreSQL Config Generator — Generate optimized postgresql.conf based on your hardware. Free PGTune alternative.

JSON Tree Viewer — Visualize JSON as an interactive collapsible tree with node path copying.

HTTP Status Codes — Look up any HTTP status code with explanations, causes, and fixes.

GitLab CI/CD Generator — Build .gitlab-ci.yml pipelines visually for any language and deployment target.

Nginx Config Generator — Build nginx.conf for reverse proxy, static sites, PHP-FPM, and load balancing with SSL and security headers.