Developer Utilities

Pretty-print messy or minified JSON with adjustable indent (2 / 4 spaces or tabs) and an optional 'sort keys alphabetically' mode. Copy or download the result, all in your browser.

Validate JSON against the RFC 8259 spec and see exactly where errors occur — line, column and a human-readable explanation — instead of the generic 'Unexpected token' message you'd get from a native parser.

Diff two JSON documents and highlight exactly which keys were added, removed, or changed — side-by-side or in a unified inline view. Structural only, so re-ordered keys are not flagged.

Paste any JSON object or array and get ready-to-use TypeScript interfaces/types. Recursive type inference with deduplication, PascalCase or camelCase naming, and interface/type alias toggle.

Generate valid JSON Schema (draft 2020-12 / 2019-09 / draft-07) from your JSON data. Infers types, detects string formats, and identifies optional vs required fields across multiple samples.

Convert any JSON array of objects into a clean CSV. Flattens nested keys with dotted notation, escapes commas/quotes per RFC 4180, and offers a customizable delimiter + UTF-8 BOM toggle for Excel compatibility.

Transform JSON documents into well-formed XML. Arrays become repeated elements; nested objects become nested elements.

Paste or drop a CSV and instantly get structured JSON. Smart numeric coercion, pretty-print, and copy/download.

Interactive grid for viewing, sorting, searching, and editing CSV files. Editable cells, column sorting, and live search.

Diff two CSV files by key column and see added, removed, and changed rows with cell-level detail.

Convert CSV to SQL with CREATE TABLE, INSERT statements, and multiple dialect support (MySQL, PostgreSQL, SQLite, ANSI).

Analyze CSV text to automatically determine the delimiter in use — comma, semicolon, tab, or pipe.

Indent 2, 4 or 8 spaces or tabs, wrap attributes when a start tag gets long, normalise empty elements and keep xml:space="preserve" subtrees exactly as they were.

Every structural error reported with its position and a plain-English reason: which element was left open, which closing tag was found, which attribute appears twice.

A diff that understands documents: inserted records are reported as additions rather than shifting every following line, and a reformatted file is not reported as a rewrite.

Type a path, see the matches as you type, and get a readable error when the engine hits an axis or function it does not implement rather than an empty result.

Format messy or minified YAML into clean, consistently indented output. Comments are preserved.

Paste your YAML and instantly see if it's valid. Invalid YAML shows a clear error message from js-yaml's parser.

Diff two YAML configs side-by-side or unified. Ignores formatting noise — only real semantic changes are flagged.

Flatten a YAML config into dotenv-style KEY=VALUE lines, with nested keys joined by double underscores (DATABASE__HOST=localhost).

Write a regex with flags and see every match, position, and capture group highlighted — perfect for debugging patterns before using them in code.

Paste any regex pattern and see every token explained in human-readable English with beginner-friendly descriptions.

Paste a regex pattern and a test string to check for catastrophic backtracking — detects nested quantifiers, overlapping alternations, and other ReDoS risks.

A split-pane Markdown editor with live GFM preview and one-click .md download.

Generate a nested table of contents from Markdown headings with GitHub-style anchors — duplicate headings handled exactly.

Extract all links (text + URL) from a Markdown document, then optionally check each URL's status in-browser.

Indent block elements, keep inline markup on one line, and never reflow the contents of pre, textarea or style.

One selector per line, one declaration per line, `property: value;` normalised — including nested media queries and CSS nesting.

A clause per line, items indented beneath it, AND/OR conditions on their own lines, keywords cased the way your team writes them.

Re-indent, space operators and break blocks — while keeping your line structure, template literals and regular expressions intact.

The JavaScript beautifier with type syntax enabled, so `Array<string>` is not spaced like a comparison.

Drop a file to encode it as a Base64 data URI (for inline HTML/CSS), or paste a Base64 string to decode and download the original file.

Paste text to see its hex representation, or paste hex to decode it back to text. Supports space-separated and continuous hex formats.

Hash any text with MD5, SHA-1, SHA-256, SHA-384, or SHA-512 using the browser's Web Crypto API — nothing is ever uploaded.

Generate HMAC signatures (SHA-256, SHA-384, SHA-512, SHA-1) for API request signing and webhook verification — your secret key never leaves the browser.

Generate one or many UUIDs — v4 (random), v1 (time-based), or v7 (time-ordered) — with bulk generation and copy buttons.

Paste a JWT and see its header and payload as pretty JSON, with expiry status and an alg:none warning.

Paste a PEM certificate (or upload .crt/.pem) and see subject, issuer, validity, SANs, and fingerprint.

Break a CIDR notation like /24 into subnet mask, network address, broadcast address, and usable hosts.

Paste a URL and see every component: protocol, hostname, port, pathname, query parameters, fragment, TLD, and origin.

Search HTTP status codes (200, 404, 500) and get the standard name, description, and appropriate use cases.

Pick the stacks you use and get one commented .gitignore file — duplicates removed, entries in a sensible order, plus a syntax check on your own patterns.

Header structure, allowed types, scope format, imperative mood, header length, the blank line before the body and BREAKING CHANGE footers — with a score.

Handles the cases people get wrong: releasing a prerelease, incrementing a prerelease counter, switching identifiers from alpha to beta, and premajor versions.

Groups commits into Added, Fixed, Changed, Breaking and the rest, links each hash when you give it a repository URL, and lists the lines it could not classify.

Understands added, deleted, renamed, copied, binary and mode-only changes, tracks hunk line numbers, and reports lines it could not place instead of hiding them.

Catches what npm only tells you at publish time — invalid names, non-semver versions, broken dependency specs, cross-section duplicates and duplicate JSON keys.

Check compose files for missing services, services without image/build, and malformed sections — before docker compose up fails.

Check workflow files for the required 'on' trigger, jobs, and steps that each have 'uses' or 'run' — a quick structural sanity check.