Developer Toolbox

JSON Formatter is a powerful online tool that helps developers format raw JSON data into a readable, indented structure. It also validates your JSON syntax and highlights errors. This tool works entirely in your browser – no data is sent to any server, ensuring your sensitive information remains private. Key features: - Pretty-print JSON with customizable indentation (2 or 4 spaces). - Minify JSON to save bandwidth. - Real-time syntax error detection with line numbers. - Support for large JSON files (up to several MB). - Copy formatted output with one click. Use cases: API response debugging, configuration file formatting, data serialization, and teaching JSON syntax. Thousands of developers use this tool daily. It's completely free, requires no login, and works offline after first load.

JSON Validator is a dedicated tool to verify whether a given string conforms to the JSON specification. Unlike formatter tools that also validate, this one focuses on providing the most precise error messages and line/column positions. Why use a separate validator? Because when dealing with machine-generated JSON or hand-written configs, invalid syntax can break your application. Our validator highlights the exact location of missing commas, trailing commas, unescaped quotes, and structural problems. Features: - Instant validation as you type (optional). - Detailed error messages derived from JavaScript's native JSON parser. - Support for nested objects and arrays. - Zero dependencies – pure browser JavaScript. Developers, QA engineers, and data analysts rely on JSON Validator to quickly debug malformed responses from APIs or to check exported data before importing into databases. No uploads, no privacy concerns.

Base64 encoding is a method to convert binary or text data into an ASCII string format using a radix-64 representation. It is widely used to embed images in HTML/CSS, send attachments over email (MIME), store binary data in JSON, and obfuscate simple strings. Our Base64 tool provides both encoding and decoding functions. You can switch modes instantly and even swap input and output with one click. Supported character sets: All Unicode strings are correctly encoded using UTF-8 before Base64 conversion, preventing the common 'latin1' misinterpretation. Use cases: - Embed small images directly into CSS as `data:image/png;base64,...`. - Encode API keys or tokens for transmission. - Decode Base64-encoded session cookies or JWT payloads (the payload part). - Quickly test encoding/decoding without opening browser dev tools. This tool respects your privacy: everything stays local, nothing is sent to any server.

URL encoding (percent-encoding) converts characters that are not allowed in URLs into a `%xx` format. For example, space becomes `%20`, `&` becomes `%26`. This is essential when building query strings or passing parameters via links. Our tool uses `encodeURIComponent` and `decodeURIComponent` which encode all reserved characters except letters, digits, and `-_.!~*'()` – that's the standard for modern web applications. Features: - One-click encode/decode. - Swap button to quickly re-encode or re-decode. - Handles UTF-8 characters (e.g., emojis, accents). - No server interaction – 100% client-side. Common scenarios: - Preparing a search query to include in a URL: `q=hello world` → `q=hello%20world`. - Decoding a callback parameter from OAuth redirects. - Escaping special characters in redirect URIs. Bookmark this tool – you'll reach for it every time you debug malformed URLs or build API clients.

Date Calculator helps you calculate new dates by adding or subtracting years, months, weeks, and days from a start date. Perfect for planning events, calculating deadlines, or finding past dates.

Unicode Converter is a powerful online tool that allows you to convert plain text into Unicode escape sequences (like \u0048\u0065\u006c\u006c\u006f) and decode them back. This is essential for developers working with internationalization, JSON string escaping, or debugging Unicode-related issues. Features: - Encode any text (including emojis and special characters) to \uXXXX format. - Decode Unicode escape sequences back to readable text. - Supports surrogate pairs for characters beyond Basic Multilingual Plane (BMP). - Instant conversion with one click. Use cases: Preparing strings for JSON files, debugging Unicode encoding in APIs, learning Unicode representation, and escaping special characters for storage or transmission.

Convert Unix timestamps (seconds, milliseconds, microseconds) to dates, and dates to timestamps. Supports both directions.

A suite of regex utilities: test regex patterns against text, generate literal regex from sample text, and get basic explanation of regex syntax.