Browser-based developer utilities

Developer Tools & Utilities

Focused utilities for comparing, formatting, converting and debugging everyday development data.

Find a tool

All Tools

23 available

JSON Difference Checker: Compare JSON DocumentsCompare two JSON documents by structure, inspect added and removed paths, and copy an RFC 6902 JSON Patch.CodeOpen ›

Unix Epoch Converter: Convert Epoch TimestampsDetect Unix seconds, milliseconds, or microseconds, convert to UTC and local RFC 3339, and build timestamps from date fields. Client-only.Date & TimeOpen ›

JSON CSV Converter: Convert Between JSON and CSVConvert JSON and CSV in your browser. Supports array-of-objects and object-of-arrays, RFC 4180 quoting, delimiters, and flatten-or-refuse nested data.EncodingOpen ›

JSON XML Converter: Convert Between JSON and XMLConvert JSON and XML in the browser. Attributes, arrays, and mixed content use a documented mapping. Not an XSD check. DTDs are refused.EncodingOpen ›

JSON YAML Converter: Convert Between JSON and YAMLConvert JSON and YAML in the browser. Bidirectional round-trip for a documented YAML 1.2 subset, with copy, download, and line-column errors.EncodingOpen ›

CSS Minifier: Minify CSS StylesheetsMinify CSS in the browser: strip comments and extra whitespace while preserving strings, url(), and calc() spacing. Copy or download the result.FormattingOpen ›

HTML Formatter: Format and Minify HTML MarkupPretty-print or minify HTML documents and fragments in the browser. Parses with DOMParser, preserves script and style, and never executes markup.FormattingOpen ›

JavaScript Minifier: Minify JavaScript SourceMinify JavaScript in the browser by stripping comments and extra whitespace while keeping strings, regex, and templates intact.FormattingOpen ›

JSON Formatter: Format and Minify JSON DocumentsPretty-print, minify, and inspect JSON in your browser. Validate with line and pointer hints, sort keys, and copy or download the result.FormattingOpen ›

Markdown to HTML Converter: Convert Markdown Documents to HTMLConvert Markdown to escaped HTML in the browser. Live safe preview, copy, and download. Raw tags cannot inject markup.FormattingOpen ›

SQL Formatter: Format SQL QueriesPretty-print SELECT, JOIN, CTE, and UNION queries in your browser. Configure keyword case and indent. Nothing is uploaded.FormattingOpen ›

XML Formatter: Format and Minify XML DocumentsPretty-print or minify well-formed XML in the browser. Control indent and attribute wrap, and see line-column parse errors. Nothing is uploaded.FormattingOpen ›

YAML Formatter: Format and Normalize YAML DocumentsPretty-print, minify, and convert YAML to JSON in the browser with indent, sort keys, comments, and line-column errors.FormattingOpen ›

Crontab Generator: Build and Explain Cron ExpressionsBuild and explain five-field cron expressions with presets, local and UTC next-run examples, and implementation caveats.GeneratorsOpen ›

UUID Generator: Generate RFC 4122 UUIDsGenerate RFC 4122 v4 and RFC 9562 v7 UUIDs locally with crypto.getRandomValues. Copy, download, or inspect version and variant.GeneratorsOpen ›

Hash Generator: Generate SHA Hashes and HMACGenerate SHA-256, SHA-384, and SHA-512 digests or HMAC in this browser. Hash text or files, copy hex or Base64, and compare two checksums.SecurityOpen ›

JWT Decoder: Decode JSON Web TokensDecode compact JWTs in this browser. Inspect alg, typ, kid, and time claims, copy JSON, and optionally verify HS256/HS384/HS512 HMAC.SecurityOpen ›

JSON Schema Validator: Check JSON Against a SchemaValidate JSON against a Draft 07 schema subset in your browser. Errors include instance and schema paths. Remote $ref is refused.TestingOpen ›

Regular Expression Tester: Test JavaScript Regex PatternsTest JavaScript regex in this browser: flags, match indices, capture groups, replace preview, and sticky lastIndex. Engine errors stay visible.TestingOpen ›

XML Validator: Check Well-Formed XML DocumentsCheck XML well-formedness in this browser with line-column errors, document stats, and DTD/XXE notes. Not XSD or DTD validity.TestingOpen ›

JSONL Viewer: Inspect JSON Lines RecordsInspect JSON Lines and NDJSON in the browser: parse each line, catch errors, filter a table of records, and copy selected JSON.Text & DataOpen ›

Text Difference Checker: Compare Text FilesCompare two texts side by side or in a unified view, with line, word, or character diffs and a copyable patch.Text & DataOpen ›

HTTP Status Code Reference: Look Up HTTP Status CodesLook up IANA-registered HTTP status codes by number or phrase, filter 1xx–5xx, copy official reason phrases, and see unused or unassigned codes.WebOpen ›