Tools
A practical catalog for debugging, data formats, auth, and test data, with enough context to choose the right tool and avoid common mistakes.
Start from the task, not the widget
These tools work better when you treat them as part of a debugging workflow, not as isolated converters.
Use JSON Formatter, YAML ↔ JSON, and Mock API Generator when the problem is malformed structure, unreadable data, or poor reproducibility.
Reach for JWT Decoder, Base64, URL Encoder, and Timestamp Converter when the issue is interpretation: claims, escaped values, or expired tokens.
Cron Parser and UUID/Timestamp helpers are most useful when they prevent a bad deploy, a wrong schedule, or debugging based on the wrong assumptions.
Tools catalog
Use these tools to validate, convert, inspect, or generate data, but start from the problem you need to solve.
Validate and format JSON with clear errors and quick copy.
Convert header-based CSV into readable JSON with basic type inference.
Transform JSON arrays into clean CSV for export, review, or handoff.
Decode JWT header and payload locally without sending data.
Convert text to Base64 and back with Unicode support.
Generate UUID v4 values and copy them to clipboard.
Transform timestamps ↔ dates in seconds or milliseconds.
Encode and decode URLs with clear error handling.
Convert YAML to JSON and JSON to YAML with clear validation.
Validate cron expressions and explain their meaning.
Generate sample JSON from a simple schema.
Recommended reading after you choose the tool
The tool is the primary action here. Use guides and task-focused articles when you need deeper context, edge cases, or implementation notes.
Practical guide: why JSON breaks, real examples, common mistakes, debugging tips, and FAQ.
Clear explanation: what decoding tells you, what you cannot know without signature verification, examples, pitfalls, and FAQ.
Real-world comparison: when to choose YAML or JSON, examples, pitfalls (indentation/types), and a production checklist.
Practical guide to generate UUID v4 across languages. Includes real snippets, compatibility notes, and dependencies when needed.
Real snippets to validate JSON and produce readable output (pretty print). Includes dependencies when the language has no built-in JSON.
Real snippets to convert header-based CSV into JSON across languages. Includes dependencies when CSV parsing is not available in the standard library.
Before using a tool on real data
This site is meant to help you inspect and validate information quickly, not replace production security or business validation.
Prefer sample payloads, fake tokens, and synthetic identifiers when screen sharing or documenting incidents.
Formatting, decoding, or converting data is not the same as validating trust, authorization, or business correctness.
If the result looks right but the bug remains, jump to the matching guide or article to review edge cases and assumptions.