Developer Tools

Common use cases

• Formatting and validating JSON payloads before committing a fix
• Decoding a JWT to inspect its claims without pasting it into a third-party site
• Converting between CSV exports and JSON for scripts
• Generating UUIDs for test fixtures or database seeds

All Developer Tools

• JSON Formatter & Validator — Format, beautify, and validate JSON data with syntax highlighting.
• Base64 Encoder — Encode text or data into Base64 format instantly.
• Base64 Decoder — Decode Base64 encoded text back to readable format.
• Regex Tester — Test regular expressions with live matching and highlighting.
• UUID Generator — Generate random UUID v4 values for your projects.
• Unix Timestamp Converter — Convert between Unix timestamps and human-readable dates.
• CSV to JSON Converter — Convert CSV data into structured JSON arrays.
• JSON to CSV Converter — Convert JSON arrays into downloadable CSV format.
• URL Encoder — Encode text for safe use in URLs and query strings.
• URL Decoder — Decode percent-encoded URLs back to readable text.
• JWT Decoder — Decode JSON Web Tokens to inspect header and payload.
• Markdown to HTML Converter — Convert Markdown text into clean HTML with live preview.
• HTML Formatter — Beautify and indent minified HTML code for readability.
• SQL Formatter — Format and beautify SQL queries for better readability.
• Color Converter — Convert colors between HEX, RGB, and HSL formats.

Frequently Asked Questions

Is it safe to paste API keys, tokens, or JWTs into these tools?

Yes — every tool on this page runs entirely in your browser using JavaScript. Nothing you type or paste is transmitted anywhere, logged, or stored. You can verify this yourself by opening your browser's network tab while using any tool here.

Do these tools work offline?

Once the page has loaded, most of them do — formatting, encoding, and validation logic runs locally. Processing your data does not require an internet connection.

What's the difference between the JSON formatter and JSON-to-CSV converter?

The formatter reorganizes existing JSON into a readable structure; the converter transforms JSON's nested structure into flat tabular rows, which only works cleanly on relatively flat data.