Free Developer Tools

Browser-based tools for developers. No signup, no upload, no server processing.

JSON and Data

Format, prettify, minify, and validate JSON directly in your browser. Convert between CSV, JSON, and TypeScript types. Instant syntax highlighting, error detection, and collapsible tree views.

JSON Formatter & Validator -- format, prettify, minify, and validate JSON instantly
CSV to JSON Converter -- convert CSV data to JSON arrays or objects
JSON to TypeScript -- generate TypeScript interfaces from JSON

Encoding & Hashing

Encode, decode, and hash data in your browser. Base64, URL encoding, and cryptographic hashes with no server round-trips.

Base64 Encoder & Decoder -- encode and decode Base64 strings and files
URL Encoder & Decoder -- percent-encode and decode URL components
Hash Generator -- generate MD5, SHA-1, SHA-256, and other hashes

Identifiers & Time

Generate UUIDs, decode JWTs, and convert Unix timestamps. Handy utilities for debugging APIs, tokens, and time-based logic.

UUID Generator -- generate v4 and v7 UUIDs instantly
Unix Timestamp Converter -- convert between Unix timestamps and human dates
JWT Decoder -- decode and inspect JWT header, payload, and signature

SQL

Format and beautify SQL queries for readability. Supports common SQL dialects with customizable indentation.

SQL Formatter -- format and beautify SQL queries

Scheduling

Translate cron expressions into plain English and preview upcoming run times. Build schedules visually instead of memorizing cron syntax. Useful for CI/CD pipelines, server jobs, and any recurring task configuration.

Cron Expression Explainer -- plain English translations and next-run previews

Text & Productivity

Password generation, word counting, and case conversion. These tools are also listed in the productivity tools hub.

Password Generator -- cryptographically random passwords with strength meter
Word & Character Counter -- real-time word, character, and readability stats
Case Converter -- convert text between multiple case formats

Privacy first. Every tool on this page runs entirely in your browser. Your code and data are never uploaded to any server. No data leaves your device. No account required. No tracking beyond basic analytics.