Dev Tools

Developer Tools

17 free online developer utilities — JSON formatter, Base64, regex tester, JWT decoder, hash generator, diff checker, and more. All client-side, no data sent to servers.

JSON

{}

JSON Formatter

Format, beautify, validate, and minify JSON data instantly.

⇄

JSON to CSV

Convert JSON arrays to CSV with custom delimiters.

TS

JSON to TypeScript

Generate TypeScript interfaces from JSON data.

⇄

CSV to JSON

Convert CSV files and data to JSON format.

Encoding

64

Base64 Encoder

Encode and decode text to/from Base64 format.

🔗

URL Encoder

Encode and decode URL components and full URIs.

MD

HTML to Markdown

Convert HTML markup to clean Markdown syntax.

Security

#

Hash Generator

Generate SHA-1, SHA-256, SHA-384, SHA-512 hashes.

🔑

JWT Decoder

Decode and inspect JWT tokens — header, payload, expiry.

ID

UUID Generator

Generate cryptographically secure UUIDs (v4).

Text

.*

Regex Tester

Test regular expressions with live highlighting and match info.

±

Diff Checker

Compare two texts and highlight differences line by line.

Code

SQL

SQL Formatter

Beautify and format SQL queries for readability.

YML

YAML to JSON

Convert YAML configuration files to JSON format.

</>

XML Formatter

Format, beautify, and validate XML documents.

Utilities

⏱

Timestamp Converter

Convert Unix timestamps to human-readable dates and back.

⏰

Cron Parser

Parse and explain cron expressions in plain English.

All-in-One Developer Toolbox

Stop switching between dozens of bookmarks and tabs. This toolbox consolidates the most-used developer utilities into a single fast, privacy-respecting site. Every tool runs entirely in your browser — no accounts, no servers, no data leaks.

Why These Tools?

  • JSON Formatter — Beautify, minify, and validate JSON payloads instantly.
  • Base64 Encoder/Decoder — Handle binary-safe text encoding for APIs and tokens.
  • JWT Decoder — Inspect token headers, claims, and expiry without a library.
  • Regex Tester — Live-highlight matches as you type, with capture group details.
  • Diff Checker — Side-by-side text comparison with line-level changes.
  • Hash Generator — SHA-1/256/384/512 hashes for checksums and verification.
  • UUID Generator — Cryptographically secure v4 UUIDs, bulk generation supported.
  • Timestamp Converter — Unix timestamps to ISO 8601 and local time and back.
  • Cron Parser — Translate cron expressions to plain English schedules.
  • SQL Formatter — Readable, indented SQL queries in seconds.