Craftisle Developer Tools

Free online developer utilities from Craftisle — JSON, regex, cron, JWT, Base64 and more. Runs entirely in your browser. No upload, no signup.

JSON Formatter & Validator

Format, validate and prettify JSON with tree view.

Regex Tester

Test regular expressions with real-time highlighting.

Regex Visualizer

Visualize regex patterns as interactive graphs.

Cron Expression Generator

Build and parse cron expressions in plain language.

JWT Decoder

Decode JWT tokens and inspect payloads client-side.

Base64 Encoder/Decoder

Encode and decode Base64 strings instantly.

HTML Formatter

Prettify and minify HTML with indentation.

SQL Formatter

Format SQL queries for readability.

YAML Formatter

Validate and format YAML configuration files.

CSV ⇄ JSON Converter

Convert between CSV and JSON with type detection.

Byte Converter

Convert between bytes, KB, MB, GB and more.

URL Encoder/Decoder

Encode and decode URL components.

Powerful, private, and free

Every Craftisle developer tool processes data locally in your browser — perfect for handling sensitive code, tokens and configuration without sending anything to a server.

Browse all 160+ tools →