SQL Formatter
Format SQL queries in your browser with dialect-aware indentation, keyword casing, comma placement, and configurable spacing options.
Developer
Help developers inspect, format, validate, and reason about technical inputs without interrupting their workflow.
Markdown Preview
Write Markdown and preview rendered headings, lists, links, tables, code blocks, and other supported HTML output side by side.
Cron Expression Tool
Explain cron expressions in plain English, preview upcoming run times, and generate five-field, seconds, or Quartz-style schedules.
JSON Formatter
Beautify, minify, validate, and sort JSON in your browser while reviewing syntax errors, nested data, arrays, and object keys.
Base64 Decode and Encode
Decode Base64 values into UTF-8 text or encode text as standard Base64 in your browser, with clear input and copy controls.
HTTP Security Headers Checker
Check a public website's redirect chain and HTTP security headers, including CSP, HSTS, frame controls, and referrer policy.
HTTP Status Sandbox
Create temporary mock endpoints that return configurable HTTP status codes and response details for testing client error handling.
Developer tools are for the small technical transformations that interrupt deeper work: formatting JSON or SQL, previewing Markdown, decoding Base64, reading cron schedules, or checking HTTP security headers. They are designed to be fast enough to use without changing context.
Software engineers, support teams, technical writers, and product teams use these utilities when they need to inspect or reshape data safely. Many of the tools run in the browser, which makes them useful for snippets, examples, and debugging notes you do not want to paste into a remote service.
Choose formatters when the input is valid but hard to read, validators and checkers when you need to diagnose a problem, and converters when the same value needs to move between representations.
Latest Developer guides
5 min read
Developer
SQL That Humans Can Review
Use consistent clauses, indentation, aliases, joins, and comments so a query can be reviewed and changed without altering what the database executes.
5 min read
Developer
Invalid JSON: A Fast, Reliable Debugging Workflow
Use parser positions, structural checks, and a repeatable narrowing process to find missing commas, broken strings, invalid values, and encoding problems in JSON.