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Developer & Data Toolbox

Free, fast, private utilities for developers and data analysts. Everything runs 100% in your browser — nothing is sent to a server.

Press ⌘K to search tools

Converters

🔄

JSON to CSV

Convert JSON arrays to CSV format

🔄

CSV to JSON

Convert CSV data to JSON arrays

🔄

JSON to YAML

Convert JSON to YAML format

🔄

YAML to JSON

Convert YAML to JSON format

🗃️

SQL to JSON

Convert SQL INSERT statements to JSON

Formatters

📋

JSON Formatter

Format, minify, and validate JSON

🔐

Base64 Encoder

Encode and decode Base64 strings

🔗

URL Encoder

Encode and decode URL components

⏰

Timestamp Converter

Convert Unix timestamps to dates

DevOps

🌐

CIDR Calculator

Calculate subnet details from CIDR notation

⏱️

Cron Parser

Parse and generate cron expressions

Generators

🎲

Mock Data Generator

Generate realistic test datasets

Why DevToolbox?

DevToolbox gives developers and data analysts a single place to handle everyday conversion, formatting, and calculation tasks without leaving the browser. Every tool runs entirely on the client side — your data never touches a server, making it safe for credentials, internal configs, and proprietary datasets.

Whether you need to convert a JSON API response into a CSV for your spreadsheet, decode a Base64 JWT payload, calculate subnet boundaries from CIDR notation, or generate realistic mock data for testing, DevToolbox has you covered with fast, zero-install utilities.

Built with Next.js and designed with a dark, editor-style theme that matches the tools developers already love. Bookmark it, share it, or self-host the static export anywhere.

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