These tools help you work with JSON, JavaScript, TypeScript, SQL, YAML, URLs, and code differences. You can format code, convert data formats, check values, and validate code securely in your browser. Browse all 18 free browser-based tools below.
Inspect, validate, format, and convert data structures between JSON, TypeScript, CSV, YAML, and XML entirely in browser memory.
Free online JSON toolkit. Format, validate, minify, and inspect JSON payloads with instant error detection and fast in-browser parsing.
Convert JSON payloads to clean TypeScript interfaces and type definitions instantly. Supports nested objects, optional keys, and union types. Free tool.
Free online CSV to JSON converter. Transform CSV spreadsheet rows into structured JSON arrays and objects with customizable delimiters and type parsing.
Free online YAML to JSON converter. Convert YAML configuration files into structured JSON format with syntax validation and instant clipboard copy.
Free online XML to JSON converter. Convert XML documents and feeds into formatted JSON objects with attribute preservation and zero server uploads.
Side-by-side text diffing, SQL statement pretty printing, JavaScript/TypeScript beautification, and RegEx debugging.
Compare code files and text snippets side-by-side. Highlights line and character diffs locally in your browser with zero data uploads or latency.
Free online text diff checker & code compare tool. Compare source code, text files, and JSON side-by-side with split diffs, inline changes, and patches.
Free online SQL query formatter and beautifier. Indent, format, and organize SQL statements for PostgreSQL, MySQL, SQLite, and SQL Server in your browser.
Free JavaScript and TypeScript code formatter. Beautify and clean up messy JS/TS syntax with configurable indentation and zero server uploads.
Free online regular expression tester and debugger. Test regex patterns with real-time match highlighting, group capture, and explanation in your browser.
Base64 encoders/decoders, Unix epoch timestamps, UUID generation, 5-field cron schedules, and HTTP status code diagnostics.
Free online Base64 encoder and decoder. Convert plain text, files, and images to and from RFC 4648 Base64 strings safely with zero server data storage.
Convert Unix timestamps and epoch time to human dates (UTC & local) instantly. Supports seconds, milliseconds & microsecond timestamps. Free online tool.
Free online UUID and GUID generator. Generate RFC 4122 Version 4 random UUIDs in bulk with uppercase, lowercase, and hyphen formatting options.
Free online cron generator and crontab calculator. Build, convert, and test 5-part cron schedule expressions in plain English with instant next run times.
Instant HTTP status code reference. Search 1xx-5xx REST API response codes, RFC 9110 specs, cache headers, and quick code fixes. Fast client-side search.
Interactive CSS Grid builders, SVG optimizers, HTML minification, and CSS generator utilities.
Free visual CSS Grid generator. Design responsive CSS grid layouts, adjust rows, columns, and gaps visually, and copy production-ready CSS code.
Free online CSS formatter and minifier. Beautify, format, or compress CSS stylesheets for faster web page load times and cleaner codebase architecture.
Free SVG optimizer and toolkit. Clean up, minify, and optimize SVG vector graphics to reduce file size while preserving render quality and scalability.
Free online HTML toolkit: format, minify, validate markup, check WCAG accessibility, audit SEO, and sanitize code with client-side processing.
Browse our complete suite of 18 browser-based developer tools utilities.
Free online JSON toolkit. Format, validate, minify, and inspect JSON payloads with instant error detection and fast in-browser parsing.
Free online regular expression tester and debugger. Test regex patterns with real-time match highlighting, group capture, and explanation in your browser.
Free online SQL query formatter and beautifier. Indent, format, and organize SQL statements for PostgreSQL, MySQL, SQLite, and SQL Server in your browser.
Free online Base64 encoder and decoder. Convert plain text, files, and images to and from RFC 4648 Base64 strings safely with zero server data storage.
Free online CSV to JSON converter. Transform CSV spreadsheet rows into structured JSON arrays and objects with customizable delimiters and type parsing.
Free online text diff checker & code compare tool. Compare source code, text files, and JSON side-by-side with split diffs, inline changes, and patches.
Free online UUID and GUID generator. Generate RFC 4122 Version 4 random UUIDs in bulk with uppercase, lowercase, and hyphen formatting options.
Convert JSON payloads to clean TypeScript interfaces and type definitions instantly. Supports nested objects, optional keys, and union types. Free tool.
Convert Unix timestamps and epoch time to human dates (UTC & local) instantly. Supports seconds, milliseconds & microsecond timestamps. Free online tool.
Free visual CSS Grid generator. Design responsive CSS grid layouts, adjust rows, columns, and gaps visually, and copy production-ready CSS code.
Free JavaScript and TypeScript code formatter. Beautify and clean up messy JS/TS syntax with configurable indentation and zero server uploads.
Free online YAML to JSON converter. Convert YAML configuration files into structured JSON format with syntax validation and instant clipboard copy.
Free SVG optimizer and toolkit. Clean up, minify, and optimize SVG vector graphics to reduce file size while preserving render quality and scalability.
Free online HTML toolkit: format, minify, validate markup, check WCAG accessibility, audit SEO, and sanitize code with client-side processing.
Free online XML to JSON converter. Convert XML documents and feeds into formatted JSON objects with attribute preservation and zero server uploads.
Free online cron generator and crontab calculator. Build, convert, and test 5-part cron schedule expressions in plain English with instant next run times.
Free online CSS formatter and minifier. Beautify, format, or compress CSS stylesheets for faster web page load times and cleaner codebase architecture.
Compare code files and text snippets side-by-side. Highlights line and character diffs locally in your browser with zero data uploads or latency.
Comprehensive guide to standard 5-field cron syntax, step intervals, special operators, edge cases, and reliable production scheduling patterns.
In-depth guide to RFC 8259 JSON syntax specifications, serialization nuances, schema validation, and real-world REST API debugging workflows.
Learn how Myers diff and LCS algorithms identify code changes, how to interpret unified diff hunks, and how to export clean Git patch files.
Comprehensive guide to regular expressions (regex). Learn token syntax, quantifiers, capture groups, positive/negative lookarounds, and ReDoS prevention.
In-depth guide to Base64 encoding. Understand radix-64 math, 6-bit chunking, padding rules, Data URIs, URL-safe variants, and browser memory considerations.
Master HTTP response status codes for scalable RESTful APIs. Detailed architectural patterns for 2xx success, 3xx redirects, 4xx client errors, and 5xx server failures.
Learn how to convert tabular CSV records into clean, structured JSON documents. Master delimiter handling, type casting, nested hierarchies, and data cleansing.
Transform raw command-line cURL queries into clean JavaScript Fetch, Axios, Python Requests, and Go HTTP client code. Master request headers, cookies, and bearer tokens.
Comprehensive developer guide to Unix epoch timestamps: POSIX seconds, sub-millisecond precision, leap second anomalies, Year 2038 mitigation, and database storage patterns.