Developer tools

Pick a tool below. Each page includes formulas, steps, and examples.

Data Formats

JSON Formatter

Format, validate, and minify JSON online. Pretty-print with 2/4 spaces or tabs, minify for compact storage, and see exact error line/column for invalid JSON.

JSON ↔ YAML Converter

Convert JSON to YAML or YAML to JSON instantly in your browser. Free, no sign-up. Supports nested objects and arrays.

JSON to CSV Converter

Convert a JSON array of objects to CSV format instantly. Supports comma, tab, and semicolon delimiters. Free, browser-side JSON to CSV tool.

Encoding

Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to plain text instantly. Supports UTF-8 and international characters. Runs entirely in your browser.

URL Encoder / Decoder

Encode or decode URL strings online. Supports encodeURIComponent for query parameters and encodeURI for full URLs. Free, instant, and handles UTF-8 characters correctly.

Epoch Cron

Cron Expression Explainer

Translate any cron expression into plain English. Understand what your cron schedule means — supports wildcards, ranges, steps, lists, and shortcuts like @daily and @weekly.

Hash Crypto

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes online. All hashing is done in your browser using the Web Crypto API — your data never leaves your device.

Ids

UUID Generator

Generate cryptographically random UUID v4 or time-ordered UUID v7 online. Supports standard, no-hyphen, and uppercase formats. Generate up to 10 UUIDs at once.

Markdown

Markdown to HTML Converter

Convert Markdown to HTML instantly in your browser. Supports headings, bold, italic, lists, links, code blocks, and more. Free Markdown to HTML tool.

Regex

Regex Tester

Test JavaScript regular expressions against any string. See all matches, capture groups, and positions — with flags g, i, m and instant feedback. Free regex tester online.

Web Http

JWT Decoder

Decode and inspect JWT tokens in your browser. View the header, payload claims, algorithm, expiry time, and subject — no server, no logging, 100% client-side.