All Developer Tools

JSON Formatter

Format, validate and beautify JSON directly in your browser.

JSON Validator

Validate JSON and pinpoint the first error with a line, column and plain-English explanation.

JSON Minifier

Compress formatted JSON into a single compact line and see exactly how many bytes you save.

JSON Diff

Compare two JSON documents and see every added, removed or changed value with its exact path.

JSON Sorter

Sort JSON object keys recursively and optionally array values, ascending or descending.

JSON to CSV Converter

Convert a JSON array of objects into a CSV file with automatic headers and proper escaping.

CSV to JSON Converter

Convert CSV files into a clean JSON array, with optional automatic type detection.

JSON to YAML Converter

Convert JSON documents into clean block-style YAML, ready for config files and pipelines.

YAML to JSON Converter

Parse YAML config files into clean JSON, with full support for anchors, block scalars and flow style.

JSON to TypeScript Converter

Generate TypeScript interfaces or type aliases from a JSON sample, with nested types inferred.

Base64 Encode & Decode

Convert text to Base64 or decode it back, with an optional URL-safe mode - all in your browser.

URL Encoder / Decoder

Percent-encode text for safe use in URLs and query strings, or decode it back to readable form.

HTML Entity Encoder / Decoder

Convert HTML to its escaped entity form or decode entities back to readable markup.

Unicode Converter

Escape text as \uXXXX sequences or decode them back to readable characters, for JSON, JavaScript and Java.

Hex Converter

Convert text to hex bytes and back, revealing the UTF-8 representation of any string.

Binary Converter

Convert text to its 8-bit binary form and decode binary strings back to readable text.

URL Parser

Break any URL into protocol, host, path, query parameters and fragment for easy inspection.

JWT Decoder

Inspect the header, payload and claims of a JSON Web Token - decoded locally, never uploaded.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 digests of any text, in your browser.

HMAC Generator

Sign a message with a secret key using HMAC-SHA256 or HMAC-SHA512, right in your browser.

UUID Generator

Generate random UUID v4 identifiers in bulk, with or without dashes, in your browser.

Random String Generator

Generate secure random strings and passwords with control over length and character set.

JWT Validator

Check a JWT's structure and time claims - signature is never verified, so the verdict is about usability, not authenticity.

Regex Tester

Test regex patterns against your text with live highlighting, capture groups and common-pattern shortcuts.

Regex Builder

Compose regular expressions from reusable blocks and watch matches highlight live against your test text.

Regex Escape Tool

Escape every regex metacharacter in a string so it matches literally inside a pattern.

Text Diff Checker

Line-by-line text comparison that shows every added, removed and unchanged line.

Unix Timestamp Converter

Two-way Unix timestamp conversion between epoch seconds and human-readable dates.

Timestamp Generator

Turn a chosen date and time into every common timestamp format at once.

Cron Expression Generator

Assemble a cron expression from field selectors with a live description and next-run preview.

Cron Expression Parser

Decode a cron expression into readable fields, a plain-English description and upcoming run times.

SQL Formatter

Beautify messy SQL with clause-aware indentation, choose UPPER or lower keywords, and minify a query to a single line.

HTML Formatter

Re-indent HTML by nesting depth, keep inline elements flowing, and minify without corrupting pre and script content.

CSS Formatter

Give every CSS declaration its own line, indent nested at-rules, normalize hex colors and minify without corrupting strings.

JavaScript Formatter

Normalize JS indentation, spacing and brace layout - or minify it - while preserving your semicolons, quotes and structure.

Markdown Preview

Live Markdown preview with GFM tables, fenced code and nested lists - plus copy or download the generated HTML.