Developer Tools
Format, validate and inspect your data.
Find the right tool
Free. No sign-up required.Developer Studio
Format and inspect code/data, plus supplied HTML, social metadata, robots and sitemaps.
Open workspaceJSON Formatter / Validator
Beautify, minify and validate JSON locally while preserving large numbers, escapes and member order.
Open toolJSON to CSV
Turn JSON records into CSV or TSV with a table preview, nested-value handling and optional formula protection.
Open toolCSV to JSON
Convert CSV or TSV to JSON records, with quoted multiline cells, header options and string-preserving output.
Open toolYAML to JSON
Convert YAML 1.2 to JSON locally, with exact integer values, clear errors, cancellation and JSON downloads.
Open toolJSON to YAML
Convert JSON into readable YAML, preserving number spellings and quoted string values. Copy or download locally.
Open toolJWT Decoder
Inspect JWT header, payload and timing claims locally. Decode only: signatures and claims remain unverified.
Open toolUUID Generator
Generate UUID v4 batches locally, with lowercase/uppercase, line lists, comma lists and JSON output.
Open toolHash Generator
Hash UTF-8 text locally with SHA-256/384/512 or legacy SHA-1/MD5. Copy hexadecimal or Base64 output.
Open toolURL Encoder / Decoder
Encode or decode URL components, whole URIs and form values, with explicit plus-sign and reserved-character rules.
Open toolHTML / CSS / JavaScript Minifier
Minify HTML, CSS or JavaScript in a local worker, with conservative options, byte totals and downloads.
Open toolRegex Tester
Test JavaScript patterns with match highlighting, capture groups and downloadable JSON reports.
Open toolTimestamp Converter
Convert Unix seconds, milliseconds and ISO dates, with UTC and browser local time.
Open toolCron Expression Explainer
Explain five-field cron schedules, inspect fields and preview upcoming UTC matches.
Open toolColor Converter
Convert HEX, RGB and HSL with alpha, a color picker and a transparency preview.
Open toolCode Diff Checker
Compare code versions by lines or word segments, with numbered changes and a private report.
Open toolXML Formatter
Format and validate XML with careful whitespace handling and local UTF-8 downloads.
Open toolTOML to JSON
Convert TOML to JSON locally with exact integer output and explicit date/time handling.
Open toolJSON to TOML
Convert JSON objects to TOML with table layouts, exact number tokens and explicit compatibility checks.
Open toolJSON Schema Validator
Validate JSON against a strict Draft-07 subset with local references and error-path reports.
Open toolJSONPath Tester
Test JSONPath queries with filters, slices, matched values and normalized paths locally.
Open toolQuery String Parser
Decode query parameters with repeated-key handling, JSON output and re-encoding.
Open toolHTTP Status Reference
Search HTTP status codes, response classes and official specification links.
Open toolByte Size Converter
Convert bits, bytes, KB/MB/GB and KiB/MiB/GiB with exact results.
Open toolString Escaper and Unescaper
Escape or unescape JSON and JavaScript strings, quotes and Unicode locally.
Open toolSQL Formatter
Format SQL locally with dialect selection, indentation and keyword case controls.
Open toolEnvironment File Formatter
Format .env spacing, check duplicate keys and sort assignment groups locally.
Open toolPasted HTML SEO Auditor
Inspect supplied HTML titles, descriptions, headings, canonical links and missing alt attributes.
Open toolMeta / Open Graph Preview
Preview supplied social metadata as inert text without fetching remote images/pages.
Open toolrobots.txt Tester
Test supplied robots.txt groups and rules against an explicit crawler token and URL.
Open toolSitemap Validator
Validate a bounded supplied sitemap XML profile and inspect URLs without fetching them.
Open tool