Developer Tools

JSON, regex, UUID generators, and more

JSON tools

Format and validate JSON, then convert it: CSV → JSON, JSON → CSV, JSON ↔ YAML, XML → JSON and list → JSON array. If a parser rejects your file, common JSON errors shows what each message means and how to fix it.

Identifiers and tokens

The UUID generator makes random v4, sortable v7, time-based v1 and name-based v5 identifiers in bulk; the GUID generator covers Windows-style formats; the JWT decoder shows a token's header and claims.

Scheduling, text and markup

Build or explain a schedule with the cron expression tool, test patterns in the regex tester, and tidy code with the SQL, XML, CSS and JavaScript formatters.

JSON Formatter/Validator

Format, minify and validate JSON. Pretty-print minified JSON or find the syntax error that breaks it.

UUID Generator

Generate random UUIDs (v4), time-ordered v7, time-based v1 and name-based v5 — one at a time or up to 1,000 in bulk.

Regex Tester

Test regular expressions with real-time matching and highlighting.

JSON ↔ YAML Converter

Convert between JSON and YAML formats.

CSV to JSON Converter

Convert CSV data to JSON format with options for headers, delimiters, and data types.

HTML ↔ Markdown Converter

Convert between HTML and Markdown formats.

CSS Minifier/Beautifier

Minify CSS for production or beautify minified CSS for readability.

JavaScript Minifier

Minify JavaScript code for production. Reduces file size.

SQL Formatter

Format SQL queries for better readability.

XML Formatter

Format and validate XML documents for better readability.

GUID Generator

Generate globally unique identifiers (GUIDs) in registry, braces, uppercase and plain formats.

Cron Expression Generator & Explainer

Build a cron expression or paste one to see it explained in plain English with its next run times.

JWT Decoder

Decode a JSON Web Token to see its header, payload and claims. Decoding only — the signature is not verified.

Lorem Ipsum Generator

Generate placeholder text for designs and mockups.

Text Diff Checker

Compare two texts and highlight the differences.

Placeholder Image Generator

Generate placeholder images for design mockups and development.

Meta Tag Generator

Generate SEO meta tags including Open Graph and Twitter cards.

.htaccess Generator

Generate Apache .htaccess configuration for redirects, security, and caching.

robots.txt Generator

Create robots.txt files to control search engine crawlers.

Sitemap Generator

Generate XML sitemaps for better search engine indexing.

XML ↔ JSON Converter

Convert XML to JSON or JSON to XML. Preserve structure, attributes, and text content.

JSON to CSV Converter

Convert JSON arrays to CSV format. Export data for spreadsheets and databases.

Markdown Table Generator

Visually create Markdown tables. Add rows and columns, edit cells, and copy the generated Markdown.

Related Guides

Common JSON Errors and How to Fix Them

UUID & GUID Explained

JWT Tokens Explained

Cron Expressions Explained

Regular Expressions: An Introduction