Developer Tools
Quick utilities for everyday dev work
Free browser-based developer utilities: JSON formatter, JWT decoder, regex tester, Base64, UUID, QR, SQL and HTML formatters, cron generator, Markdown editor, and more. Everything runs client-side — no upload, no account, no server.
Tools
Format and validate JSON securely in your browser. Pretty-print, minify, and inspect syntax errors without sending sensitive payloads to a server.
Decode header and payload of a JWT.
Generate UUIDs v4 in bulk.
Test regex patterns in real time.
Encode and decode Base64.
Format SQL queries with multiple dialects.
Format and indent HTML.
Minify CSS to the smallest size.
Minify JavaScript to the smallest size.
Build and explain cron expressions.
Markdown editor with real-time HTML preview.
Generate QR codes for URL, Wi-Fi, email, SMS and more.
Generate strong passwords with advanced options.
Analyze entropy and time to crack a password.
SHA-1, SHA-256, SHA-384 and SHA-512 from text and files.
Sign messages with HMAC-SHA.
Generate signed JWT tokens (HS256/384/512).
Encode and decode URLs.
Encrypt text with a password via AES-GCM.
From the blog
Free JSON Formatter Online (2026)
Looking for a free JSON formatter online? Format, validate, and troubleshoot JSON in your browser with a privacy-conscious workflow for API payloads.
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A 12-char password with mixed characters takes 3,000 years to crack. Here's the math and a free generator.
Developer ToolsCSV to JSON Conversion Guide
The 4 conversion bugs that silently corrupt your data. Commas in quotes, BOM markers, type coercion. How to avoid all of them.
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