# FlowingDev

> Free, private, browser-based developer tools to format, validate, convert and inspect technical data. All processing happens locally in the browser; pasted content is never uploaded. No sign-up. Available in 10 languages (en, es, pt, fr, de, zh, ja, ar, hi, id).

Localized versions: English lives at the root (e.g. https://flowingdev.com/json); other languages use a language prefix (e.g. https://flowingdev.com/es/json, /fr/json, /ja/json). Every page declares hreflang alternates.

## Tools

- [JSON Viewer](/json): Format, validate, minify and explore JSON as a collapsible tree with syntax highlighting. Free, private, runs 100% in your browser.
- [XML Viewer](/xml): Beautify XML, validate structure and inspect documents as a tree with syntax colors. Free and private, nothing leaves your browser.
- [JWT Viewer](/jwt): Decode JSON Web Tokens to read header, payload, claims and expiry with color-coded segments. Tokens never leave your browser.
- [YAML Viewer](/yaml): Validate and format YAML, convert YAML to JSON and JSON to YAML, and browse data as a tree. Free and private.
- [Markdown Viewer](/markdown): Write Markdown with a safe live preview and export clean HTML output. Supports tables and code blocks. Runs in your browser.
- [Base64 Tools](/base64): Encode text to Base64 or decode Base64 back to text with full Unicode support. Free, instant and private.
- [URL Encoder](/url): Encode or decode full URLs and individual URL components (percent-encoding). Free, instant and private.
- [Hash Generator](/hash): Generate MD5, SHA-1, SHA-256 and SHA-512 hashes from any text instantly in your browser.
- [Encryption Tools](/crypto): Encrypt and decrypt text with password-based AES-GCM, AES-CBC or AES-CTR (128/192/256-bit). Keys and data stay in your browser.
- [Regex Tester](/regex): Test JavaScript regular expressions with flags, see every match and capture group live. Free and private.
- [SQL Viewer](/sql): Format and beautify SQL queries with syntax highlighting. Free, instant and processed locally in your browser.
- [CSV Tools](/csv): Convert CSV to JSON, JSON to CSV, or view CSV as an HTML table. Free, private and runs in your browser.
- [JS / TS Tools](/js): Beautify or minify JavaScript and TypeScript code locally. Minifying converts TypeScript to plain JavaScript.
- [Code Indenter](/indent): Auto-indent and beautify code in JS, TS, JSON, HTML, CSS, Markdown, YAML and GraphQL, with language auto-detection and file upload.
- [UUID Generator](/uuid): Generate one or many UUIDs (v4) with format options, crypto-secure and offline.
- [Random Generator](/random): Random numbers in a range or random strings with custom charsets, generated locally.
- [Lorem Ipsum Generator](/lorem): Lorem Ipsum placeholder text with a configurable number of paragraphs, generated locally.
- [Password Generator](/password-generator): Strong random passwords with configurable length, character sets and ambiguity exclusion, generated locally.
- [JSON Editor](/json-editor): Edit JSON as text, tree, table or form side by side; download the result.
- [XML Editor](/xml-editor): Edit XML as text, tree, table or form side by side; download the result.
- [YAML Editor](/yaml-editor): Edit YAML as text, tree, table or form side by side; download the result.
- [Markdown Editor](/markdown-editor): Write Markdown and rich text side by side with a formatting toolbar, synced live; download .md.
- [HTML Editor](/html-editor): Edit HTML source with a live rendered preview, one-click formatting, and .html download.
- [CSP Checker](/csp): Analyze a Content-Security-Policy, list its directives and flag unsafe-inline, unsafe-eval, wildcards and missing directives. Runs in your browser.
- [Security Headers](/headers): Paste HTTP response headers and get a security grade with per-header explanations and recommended values. Free and private.
- [Password Strength](/password): Estimate password entropy, detect common patterns and see offline crack-time estimates. Nothing is stored or sent anywhere.
- [HTTP Message Viewer](/http): Paste a raw HTTP request or response and see it as a clean field-by-field view with one-click copy: method, status, headers, query parameters and body.
- [HTML Viewer](/html): Paste HTML code and see the live rendered result in a sandboxed preview next to the source.
- [Smart Detect](/detect): Paste any content and automatically identify whether it is JSON, XML, JWT, YAML, Base64, URL-encoded or Markdown.

## Privacy

- No backend processing, no accounts, no tracking of pasted data.
- Encryption uses the Web Crypto API (PBKDF2 + AES) inside the browser.

## Colors
- [Color Picker & Converter](/color): Convert between HEX, RGB, HSL, HSV, OKLCH and CMYK.
- [Web Palette Generator](/palette): Complete website color scheme from a brand color or logo, 5 personalities, live mini-site preview, CSS variables.
- [Contrast Checker](/contrast): WCAG AA/AAA contrast ratio with automatic fix suggestion.
- [Random Color Generator](/random-color): Random colors by style with guaranteed minimum chromatic distance.
- [Color Scale Generator](/color-scale): Tailwind-style 50-950 scale as CSS tokens.

## Developer utilities
- [Cron Expression Parser](/cron): Explain cron expressions in plain English and list the next run times.
- [Diff Checker](/diff): Compare two texts or JSON documents side by side and highlight changes.
- [Epoch Converter](/epoch): Convert Unix timestamps to dates and back, with a live clock.
- [CSS Unit Converter](/css-units): Convert px, rem, em, vw, vh, % and pt, and build fluid clamp() values.
- [cURL to Code](/curl): Convert cURL commands into fetch, Axios, Python, Go or PHP code.
- [Subnet / CIDR Calculator](/cidr): Calculate network, broadcast, host range and masks from an IPv4 CIDR.
- [GraphQL Formatter](/graphql): Beautify or compact GraphQL queries, fragments and schemas.
- [SVG Optimizer](/svg): Preview, clean and minify SVG, and export it as a Data URI or Base64.
- [Favicon Generator](/favicon): Create favicon.ico, Apple and Android icons plus head tags from one image.
- [Image ↔ Base64](/image-base64): Convert images to Base64 or Data URI and back, with resize and compression options.
- [Excel Viewer & Converter](/excel): Open Excel files and convert sheets to CSV, JSON, HTML or Markdown.
- [JSON to Excel](/json-excel): Turn JSON arrays into a native .xlsx workbook.
- [Image Converter](/image-convert): Convert JPG, PNG or GIF to WebP (or PNG/JPEG), resize and compress, and download the result.
- [SRI Hash Generator](/sri): Generate Subresource Integrity hashes and script or link tags.
- [HMAC Generator](/hmac): Sign messages with HMAC SHA-1/256/384/512 and verify webhook signatures.
- [Mock Data Generator](/mock): Generate realistic fake JSON records for testing from a field template.