Developer tools
Daily dev utilities for JSON, regex, JWT, cron, and more — private and instant in your browser.
These tools handle the repetitive debugging and formatting tasks that interrupt development flow. The JSON validator and formatter catches syntax errors with line and column hints, sorts keys, and collapses or expands nested objects. It processes JSON entirely in the browser so API responses and config files with sensitive values never reach a server. The regex visualizer runs JavaScript patterns against test input with full match indexes, group captures, and a runtime flag editor, replacing the need to test patterns in a REPL.
The JWT decoder shows header and payload fields with expiry badges and claim explanations without any network request. The visual cron schedule builder converts between cron expressions and human-readable schedules with a field editor and preset library. The JSON-to-TypeScript interface generator produces typed interfaces, type aliases, or Zod schemas from pasted JSON. Additional tools include a Base64 encoder/decoder, a Unix timestamp converter, and an HTTP status code reference. Everything runs client-side.
Private JSON Validator & Formatter
Validate and format JSON in-browser with line and column hints, key sorting, and copy or download output.
Regex Visualizer & Tester
Test JavaScript regex with full match indexes, group captures, runtime stats, and replacement preview.
Visual Cron Schedule Builder
Build cron expressions visually with presets, field editor, plain English summary, and next ten run times.
JWT Decoder & Debugger
Decode JWT header and payload in-browser with expiry badges, claim notes, and optional HMAC signature checks.
JSON to TypeScript Interface Generator
Paste JSON to generate TypeScript interfaces, type aliases, or Zod schemas with nested types and optional fields.
SQL Formatter (Multi-dialect)
Format SQL with indentation, keyword casing, and dialect-aware quoting for MySQL, PostgreSQL, BigQuery, and T-SQL.
Markdown Live Editor
Write Markdown with live HTML preview, GFM tables and task lists, sync scroll, and export to HTML or .md.
JSON Diff Viewer
Compare two JSON objects with color-coded added, removed, and changed keys plus a copyable diff report.
Base64 encoder / decoder
Encode and decode Base64 with standard, URL-safe, MIME, UTF-8, file upload, and image preview.
URL encoder / decoder
Percent-encode and decode URLs, query strings, and path segments with RFC 3986 or form rules.
UUID generator
Bulk UUID v4, v5, and nil generator with uppercase, hyphen, SQL format, validation, and download.
Hash generator
MD5 and SHA family hashes plus HMAC for text or files with hex, Base64 output, and hash compare.
JSON to YAML converter
Bidirectional JSON and YAML conversion with validation, indent options, and anchor resolution.
HTTP status codes
Searchable HTTP status reference with causes, fix guidance, class filters, and RFC notes.