All tools
Developer tools directory
A fast set of browser-based utilities for formatting payloads, cleaning code, decoding tokens and converting everyday developer data.
Formatters
Payload, config and code cleanup
JSON FormatterFormat, validate, minify and inspect JSON with a tree view.
JSON Schema GeneratorInfer a JSON Schema from sample payloads and run basic validation.
XML FormatterBeautify XML, validate structure and convert XML to JSON.
YAML FormatterClean indentation and catch common YAML structure issues.
SQL FormatterFormat, compact and check common SQL query structure.
Python FormatterNormalize indentation, blank lines and trailing whitespace.
CSV to JSONConvert tabular CSV text into clean JSON arrays.
Inspectors
Debug and inspect developer strings
API Debugging ChecklistTrack request identity, auth, payload, logs, retries and final fix notes.
HTTP Status CodesSearch response codes and read practical API debugging notes.
HTTP Headers ReferenceSearch request, response, cache, CORS and security headers.
Regex TesterTest patterns, flags, matches, indexes and capture groups.
JWT DecoderDecode headers, payload claims and expiration timestamps.
Timestamp ConverterConvert Unix seconds, milliseconds and ISO date values.
Cron ParserExplain cron expressions and preview upcoming run times.
Converters
Encode, generate and transform values
Guides
Context for safer, better tool usage
Developer GuidesRead original Formalint guides for formatting, validation and safe sample handling.
API Debugging GuideUse a repeatable process for status codes, payloads, logs and schema checks.
JSON Schema GuideLearn how generated schemas, required fields and array examples should be reviewed.
Safe Online ToolsLearn what not to paste into browser-based utilities.
SQL Formatting GuideReview practical formatting patterns for readable SQL.