28 utilities for developers + SEO.
No sign-up. No tracking. No ads.
Format, validate, minify, and sort JSON. Error messages with line numbers. Escape and unescape strings.
Encode and decode Base64. Works with text and files. URL-safe variant supported.
Convert between CSV and JSON. Handles quoted fields, custom delimiters, auto-detects direction.
Format messy SQL queries. Indented clauses, keyword case, comma style. Handles comments and strings correctly.
Compare two JSON documents structurally. See added, removed, and changed values per path.
Paste a JSON sample, get a JSON Schema. Auto-detects types, formats, enums, required fields.
Convert YAML to JSON or JSON to YAML. Format and validate. Handles anchors, aliases, multi-line strings.
Format, minify, and convert XML. Handles attributes, namespaces, CDATA, processing instructions.
Every HTTP status code with common causes and what to do. Searchable, filterable, jump-by-code.
Collapse whitespace, strip comments and inline CSS/JS — or beautify back with consistent indentation.
Strip comments and whitespace for production, or re-expand minified CSS into readable indented form.
Compact JavaScript by removing comments and whitespace, or format minified JS with consistent indentation.
Break any URL into protocol, host, port, path, query, fragment. See each query param on its own line. Decode on.
Paste any User-Agent string to see the browser, engine, OS and device it identifies as. Detects major edge cases.
Encode and decode URL components. Parse query strings into a readable table.
Test JavaScript regex with live match highlighting, capture groups, and replace.
Encode special characters to HTML entities and back. Named or numeric, safe or full.
Convert text to 8-bit binary and back. UTF-8 aware so emojis and accents round-trip correctly.
Generate cryptographically random v4 UUIDs. Batch up to 1000 at a time. Multiple formats.
Combine curated templates for languages, frameworks, IDEs, and operating systems. Inlined, no external fetches.
Calculate IPv4 subnet ranges, masks, host counts, and binary representations from any CIDR notation.
Convert between octal, symbolic, and chmod commands. Visual checkboxes for user/group/other.
See how your page appears in Google — desktop + mobile snippets with title (60 char) and description (155 char) truncation.
Visual builder for robots.txt — user-agent rules, allow / disallow paths, sitemap link, crawl-delay. Block AI crawlers preset.
Paste URLs — get a valid sitemap.xml with lastmod, changefreq, priority. Download as file.
JSON-LD for Article, FAQ, Product, LocalBusiness, Recipe, HowTo, Event, Organization, BreadcrumbList.
Paste Markdown — get a table of contents with GitHub-style anchor links. Configurable depth.
Write JSONPath queries ($.foo[*].bar), see matches live. Filter expressions + slices supported.
Generate TypeScript interfaces from JSON with inferred types and nested interfaces.
Convert HTML to React JSX — className, style objects, self-closing tags, camelCased attributes.
Build a copy-paste curl command from a form: method, URL, headers, JSON body, auth.
Escape or unescape strings for JSON, JS, HTML, URL and backslash sequences. Two-way.
Generate Nano IDs and sortable ULIDs in bulk. Cryptographically random, URL-safe.
Minify SVG, strip editor cruft + metadata, export as optimized SVG, CSS data-URI or img tag.
Luhn-valid fake card numbers for testing payment forms. Visa/MC/Amex/Discover. Validator too.
Bitcoin-style Base58 (no confusing 0 O I l). Encode text or decode back. Two-way.
Generate dynamic Discord
Build HTML table markup: rows, columns, header row, borders, striping. Live preview.
HTTP status code + full redirect chain (301 → 200) for any URL. Find broken links.
Inspect any URL's response headers + security-header checklist (HSTS, CSP, XFO).
File extension ↔ Content-Type MIME lookup, searchable reference table.
ASCII reference: decimal, hex, octal, binary and character for every code.
AND/OR/XOR/NOT and bit shifts on two integers, shown in dec, hex and binary.
IPv4 ↔ binary, hex and 32-bit integer.
Convert JSON to Go structs with json tags and inferred types.
Live-render pasted HTML in a sandboxed iframe. Test snippets and markup instantly.
Convert text to hexadecimal bytes and hex back to text. UTF-8 aware.
Encode/decode text ↔ RFC 4648 Base32, UTF-8 aware, fully client-side.
Convert dotenv files to JSON and back. Handles comments & quoted values.
Generate random MAC addresses — pick separator, case and count.
Generate Python @dataclass definitions from JSON, with nested classes & types.
Generate serde Rust structs from JSON — inferred types, snake_case, nested.
Generate Kotlin data classes from JSON — inferred types, nested classes.
Generate an Apache .htaccess — HTTPS, www, gzip, caching, error pages.
Pick a task → the exact git command + a plain explanation (undo, branch, stash…).
Format & indent GraphQL queries, mutations and schemas — even minified input.
Edit CSV in a table — add/remove rows & columns, export. Handles quoted fields.
Generate sortable 26-char ULIDs with an embedded timestamp, a UUID alternative.
Compact URL-safe random IDs with custom length and alphabet, a UUID alternative.
Generate a ready-to-use LICENSE file (MIT, ISC, BSD, Unlicense) with your name and year.
Generate an .editorconfig file for consistent indentation and whitespace across editors.
Validate an IBAN with the mod-97 checksum and country length, formatted for reading.
Validate ISBN-10 / ISBN-13 by check digit and convert between the two formats.
Encode/decode text ↔ Ascii85 (Base85), more compact than Base64. UTF-8 aware.
Explore JSON as a collapsible, colour-coded tree. Great for large API payloads.
Convert INI config files to JSON and back. Handles sections and comments.
Flatten nested JSON to dot-notation keys and unflatten back. For configs and i18n.
Convert JSON Lines (NDJSON) to a JSON array and back. For logs and data pipelines.
Parse a URL query string into JSON and build one back. Handles encoding and arrays.
Per-character Unicode code point, HTML entity, and UTF-8/UTF-16 bytes. Handles emoji.
A comprehensive developer utility belt — JSON / YAML / XML / SQL formatters, CSV ↔ JSON, regex tester, URL encoder + parser, HTML / CSS / JS minifiers, Base64, UUID, .gitignore generator, CIDR / chmod calculators, HTTP status reference, SEO helpers (SERP preview, robots.txt builder, sitemap.xml generator, JSON-LD schema generator), Markdown TOC, JSONPath tester, and more.
Yes — every tool in the Developers category is free, no sign-up, no usage limits, no API keys required.
No. Everything runs in your browser via JavaScript. Even the JSON / YAML / XML formatters use locally-bundled parsers — your source code never leaves your device.
Yes — the regex tester runs entirely in your browser's JavaScript engine. Neither the regex nor the test input is sent anywhere.
Different ends of the same workflow. Minify for production (smaller files, faster loads). Format / beautify when reading minified code or debugging.