Dev Tools
Essential utilities for software development.
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JSON Formatter
Format, validate, and explore JSON documents in the browser.
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JSON Diff
Compare two JSON documents side by side and highlight differences.
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SQL Formatter
Pretty-print SQL queries across major dialects.
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SQL Diff
Compare two SQL statements and highlight differences.
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JWT Decoder
Decode and inspect JSON Web Tokens client-side.
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UI Unit Converter
Convert between px, rem, em, and other CSS units.
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Color Comparison Picker
Compare multiple similar colors with independent UI previews.
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URL Encoder
Encode and decode URL components on the fly.
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Regex Tester
Test regular expressions with live highlighting.
About Dev Tools
LivHome's developer tools are a free collection of browser-based utilities for everyday coding tasks like formatting, decoding, and comparing data. Most run entirely in your browser, so the text you paste stays on your device.
This group covers the small jobs that come up while building software: a JSON Formatter with side-by-side JSON Diff, a SQL Formatter with SQL Diff across major dialects, a JWT Decoder, a Regex Tester, a UI Unit Converter for px, rem, and em, a Color Comparison Picker, and a URL Encoder.
Reach for the JSON tool to pretty-print or validate an API response, or its diff view to compare two outputs; use the SQL Formatter to clean up queries and SQL Diff to spot changes between two statements. The JWT Decoder inspects token headers and payloads, the Regex Tester highlights matches as you type, and the unit, color, and URL helpers handle quick front-end conversions and encoding.
The JWT Decoder and the formatters process your input locally in the browser. The one exception is an optional helper in the JSON tool that fetches a JSON schema from a URL you provide, which does make an outbound request to that address.
Frequently asked questions
- Are these developer tools free?
- Yes. Every tool in this category is free to use with no usage limits.
- Do I need to sign up or log in?
- No account is required. You can open any tool and start using it right away; signing in only enables optional favorites and settings sync.
- Is my data sent to a server?
- For the formatters, JWT Decoder, and other utilities, processing happens in your browser and your input is not uploaded. The only exception is the JSON tool's optional fetch-from-URL feature, which requests the address you enter.