💻

Developer Tools

Format JSON, encode Base64, test regex, minify CSS/JS, convert data formats, and debug JWT tokens.

All Developer Tools

33 tools

Format, validate, and beautify JSON data with syntax highlighting.

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 back to text.

Generate random UUIDs (v4) instantly.

Test and debug regular expressions with live highlighting.

HTML Encoder/Decoder

Encode or decode HTML entities.

URL Encoder/Decoder

Encode or decode URL components and percent encoding.

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Generate URL-friendly slugs from any text.

Convert text to binary code and binary back to text.

Encode or decode text using the ROT13 cipher.

Minify CSS code by removing whitespace and comments.

Format and beautify CSS code with proper indentation.

JavaScript Minifier

Minify JavaScript code to reduce file size.

Markdown to HTML

Convert Markdown text to HTML code.

HTML to Markdown

Convert HTML code to Markdown format.

Convert CSV data to JSON format.

Convert JSON arrays to CSV format for spreadsheets.

Decode and inspect JSON Web Tokens.

Cron Expression Parser

Parse and explain cron schedule expressions.

View and explore CSV files as formatted tables.

Convert JSON data to YAML format.

Convert YAML data to JSON format.

Binary to Decimal

Convert between binary, decimal, octal, and hexadecimal.

Extract files from a ZIP archive directly in your browser.

Compress multiple files into a single ZIP archive locally.

Convert Excel spreadsheets (XLSX) to CSV format locally.

Convert CSV data into an Excel spreadsheet (XLSX).

Convert Excel spreadsheets (XLSX) into structured JSON arrays.

Convert JSON data into an Excel spreadsheet (XLSX).

Base64 to Image

Decode a Base64 string back into a downloadable image file.

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes for text or files locally in your browser.

Color Converter

Convert colors between HEX, RGB, HSL and HSV with a live preview and luminance readout.

Number Base Converter

Convert numbers between binary, octal, decimal, hex and any base from 2 to 36.

Related Categories

✏️ Text Tools 🏁 Testing Tools 🧮 Calculators

Related Guides

JSON Formatter: The Developer Guide

Frequently Asked Questions

Does it validate JSON?

Yes. Invalid JSON will show an error message indicating the problem.

Can I minify JSON as well?

Yes. The Minify button collapses formatted JSON back into one compact line, which is handy for storing payloads or writing single-line log output.

Why is valid-looking JSON rejected?

Strict JSON disallows trailing commas, single quotes, and unquoted keys - common habits from JavaScript or YAML. The validator points at the offending position so you can fix it quickly.

Can I change the indentation?

Yes. You can pick the indentation width used for pretty-printing so the output matches your team's style, for example two spaces.