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Developer Tools

Format, encode, decode and generate for developers.

JSON Formatter

Format, minify and validate JSON in your browser with readable output and clear syntax errors.

Developer Tools

JSON Validator

Check whether a JSON string is valid.

Developer Tools

Base64 Encoder/Decoder

Encode text to Base64 and decode it back.

Developer Tools

URL Encoder/Decoder

Percent-encode or decode URL query strings.

Developer Tools

UUID Generator

Generate one or many UUID v4 identifiers.

Developer Tools

Timestamp Converter

Convert between Unix timestamps and human-readable dates.

Developer Tools

Hash Generator (SHA-256)

Generate a SHA-256 hash from any text using the Web Crypto API.

Developer Tools

Color Converter

Convert between HEX and RGB with a live preview.

Developer Tools

Regex Tester

Test JavaScript regular expressions with live matches.

Developer Tools

QR Code Generator

Generate a QR code for any URL or text, and download as PNG.

Developer Tools

JSON Minifier

Minify JSON by removing extra whitespace after validating it.

Developer Tools

HTML Entity Encoder/Decoder

Encode or decode HTML entities like lt, gt, amp and quotes.

Developer Tools

JWT Decoder

Decode JWT header and payload in your browser without verification.

Developer Tools

URL Parser

Break a URL into protocol, hostname, path, query parameters and hash.

Developer Tools

UTM Builder

Build campaign URLs with UTM source, medium, campaign, term and content.

Developer Tools

Category guide

What you can do with Developer Tools

Developer tools help format, validate, encode, decode and inspect technical data. They are useful for quick API checks, payload cleanup and debugging small snippets.

Best for

  • - Formatting and validating JSON
  • - Encoding, decoding and parsing URLs or Base64
  • - Generating hashes, UUIDs, QR codes and campaign URLs

Tips

  • - Do not paste production secrets unless you understand the risk.
  • - Validate generated output before using it in code.
  • - Use JSON tools before sharing API examples or debugging payloads.

Privacy note

Tools in this category are designed to work in the browser where possible. File-heavy tools can still depend on browser memory, codecs and source file quality.

Quick picks

Popular developer tools

4 tools
JSON FormatterFormat, minify and validate JSON in your browser with readable output and clear syntax errors.Base64 Encoder/DecoderEncode text to Base64 and decode it back.Regex TesterTest JavaScript regular expressions with live matches.QR Code GeneratorGenerate a QR code for any URL or text, and download as PNG.

Explore more

Related categories

Text ToolsCalculatorsPDF Tools

Help

Frequently asked questions

Can I decode JWT tokens here?

Yes, JWT decoding is available for header and payload inspection, but signatures are not verified.

Are developer tools client-side?

They are built to run in the browser where possible, which helps with privacy and speed.