Developer Tools

Choose a browser-side helper for parsing structured text, inspecting URLs and query parameters, testing JavaScript regex, previewing five-field cron, encoding text, or converting developer data.

Start with the artifact you need to inspect. Use JSON tools for standard JSON syntax, URL Parser for the whole link, Query String Parser for parameters after ?, Regex Tester for JavaScript RegExp samples, and Cron Expression Parser for five-field Unix schedules. Each tool documents its parser or runtime boundary; none proves business validity, link safety, cross-engine regex behavior, or scheduler compatibility.

Who these tools are for

  • Developers checking encoded text, JSON, timestamps, UUIDs, and HTML entities.
  • Editors and operators checking payloads, links, schedules, and text transformations.
  • Teams that need reproducible examples plus explicit parser and runtime boundaries.

Pick the parser before changing the data

For {"state":"draft"}, use JSON Formatter to read structure or JSON Minifier to serialize compactly. For https://example.com/a%2Fb?tag=one&tag=two#top, use URL Parser for scheme/path/fragment and Query String Parser for repeated tag values. Encoding tools change representation; they do not validate the surrounding protocol.

Test runtime-specific text and schedules

Regex Tester follows the current browser JavaScript RegExp and exposes gimsuy only. Cron Expression Parser follows five-field Unix syntax, local/UTC preview, day-of-month versus weekday OR semantics, and a 366-day search window. Recheck either result in the target backend or scheduler.

Local handler does not mean a trusted environment

The current transformation handlers run in browser code without an input-upload endpoint, but the page, extensions, clipboard, device, and third-party scripts are separate trust boundaries. Redact credentials, tokens, personal data, and production logs before pasting.

Frequently asked questions

Which tool should inspect a callback URL?
Parse the complete callback with URL Parser first, preserving serialized and decoded path views. Then use Query String Parser to inspect blanks, repeated keys, + versus %2B, and grouped JSON. Neither tool checks reachability or reputation.
Does compact JSON preserve exact payload bytes?
No. JSON.parse followed by JSON.stringify can change large numbers, numeric spelling, negative zero, duplicate keys, and integer-like key order. Do not transform signed or byte-sensitive payloads without checking the protocol.
Can a green regex or cron preview be copied directly to production?
Not safely by itself. Add counterexamples and long-input tests for regex, and compare cron fields, timezone, OR semantics, and provider extensions with the actual target documentation and logs.

Tools

  1. Base64 Encoder Decoder
  2. URL Encoder Decoder
  3. URL Parser
  4. Query String Parser
  5. HTTP Status Code Reference
  6. Cron Expression Parser
  7. Regex Tester
  8. Markdown Table Generator
  9. HTML Minifier
  10. CSS Minifier
  11. JavaScript Beautifier
  12. JSONPath Tester
  13. JSON Formatter
  14. JSON Minifier
  15. XML Formatter
  16. YAML Formatter
  17. TOML Formatter
  18. CSV to JSON Converter
  19. JSON to CSV Converter
  20. JWT Decoder
  21. Unix Timestamp Converter
  22. HTML Entity Encoder Decoder
  23. UUID Generator

Guides