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 Diff ViewerCompare two JSON snippets side by side and find added, removed or changed fields. JSON Schema GeneratorInfer a JSON Schema from sample payloads and run basic validation. XML FormatterBeautify XML, validate structure and convert XML to JSON. XML LinterRead xmllint-style checks for well-formed XML, parse errors and integration payloads. YAML FormatterClean indentation and catch common YAML structure issues. YAML Indentation CheckerFix YAML spacing, nested keys, list blocks and tabs before a config parser fails. SQL FormatterFormat, compact and check common SQL query structure. SQL Cleanup ToolClean SQL queries for reviews, debugging notes and readable handoffs. Python FormatterNormalize indentation, blank lines and trailing whitespace. Python Indentation FixerFix mixed tabs and spaces in Python snippets before copying them into an editor. 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 MatcherUnderstand regex matching, parser behavior, flags and capture groups before testing. Regex TesterTest patterns, flags, matches, indexes and capture groups. Regex ExamplesReview practical patterns before testing them in the matcher. Email Regex ValidatorUse a practical JavaScript email validation pattern with realistic test cases. URL Regex ValidatorCheck HTTP and HTTPS link shapes before using a real URL parser. UUID v4 RegexValidate UUID version and variant characters for API identifiers. Date Regex ValidatorCheck YYYY-MM-DD strings and learn where calendar parsing is still needed. Regex Log ParserCapture timestamps, log levels and messages from semi-structured logs. 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

Base64 EncoderEncode and decode UTF-8 text as Base64. URL EncoderEscape query values and decode percent-encoded strings. Hash GeneratorCreate SHA digests for text snippets in the browser. UUID GeneratorGenerate UUID v4 values quickly. Color ConverterConvert HEX, RGB and HSL color 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. Regex ExamplesLearn when common regex patterns are useful and where they should be reviewed. 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.