Developer tools that just work

20 free tools for everyday dev work: format, decode, compare, convert and generate. Everything runs locally in your browser, so your tokens, payloads and code stay private.

/

JSON & Data

JSON Formatter Beautify, minify and validate JSON with line/column errors. JSON Diff Compare two JSON objects and list changes by path. JSON to TypeScript Generate TypeScript interfaces and types from a JSON sample.

Encode & Decode

Base64 Encode / Decode Encode/decode Base64 and base64url, text or files. URL Encode / Decode Percent-encode/decode text and parse URL query strings. HTML Entity Encoder / Decoder Escape HTML special characters or decode &entities;. JWT Decoder New Decode JWT header and payload, check expiry, verify HS256.

Compare & Test

Text Diff Checker Compare two texts side by side with word-level highlights. Regex Tester Live JavaScript regex testing with groups and replace.

Format & Minify

SQL Formatter Beautify or minify SQL for PostgreSQL, MySQL, T-SQL, BigQuery and more. JavaScript Minifier Compress and mangle JS with Terser, with size and gzip stats. CSS Minifier Shrink stylesheets: shorten values and merge duplicate rules. HTML Minifier Strip comments and whitespace, and minify inline CSS/JS.

Code Converters

YAML to JSON Convert YAML configs to JSON, with multi-document support and precise errors. JSON to YAML Turn JSON into readable YAML with indent, style and quoting options. cURL Converter Turn curl commands into fetch, Axios, Python, Go or PHP code.

Generators & Time

UUID Generator Bulk UUID v4/v7 generator, validator and inspector. Hash Generator MD5, SHA-1, SHA-256, SHA-512 and HMAC for text and files. Cron Expression Generator Build, explain and validate crontab schedules with next run times. Unix Timestamp Converter Epoch ↔ date with unit auto-detection and time zones.

Why use DebugToolbox?

Private by design. Every tool runs as JavaScript in your browser tab. JWTs, API responses, SQL queries and config files are never uploaded, logged or stored on a server, so it is safe to paste production data.

Fast and focused. Each tool is a single lightweight page that loads only the code it needs and processes input as you type. There are no accounts, no paywalls and no pop-ups between you and the result.

Built for real debugging. Errors point to the exact line and column, decoders explain what they found (like when a token expires or what a cron schedule means), and every result is one click away from your clipboard.

Popular workflows