Dev Tools
Essential utilities for software development.
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Data Converter
NewConvert JSON, YAML and CSV locally, preserving numeric tokens and CSV cell text within explicit supported formats.
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Cron Explainer
NewExplain a five-field Cron expression and inspect the next five occurrences in an explicit timezone.
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UUID & ULID Generator
NewGenerate UUID v4 and sortable ULID identifiers locally. Create a batch, copy individual IDs or download the current list.
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Markdown Preview
NewEdit Markdown, preview it live, and share the document in a compressed link.
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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.
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.
Formatting and JWT operations run in the browser. Optional JSON Schema fetching and remote Markdown images request their external addresses; page analytics, ads and sign-in are separate requests.
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.
- What network requests can the page make?
- Formatting and JWT operations run in the browser. Optional JSON Schema fetching and remote Markdown images request their external addresses; page analytics, ads and sign-in are separate requests.
For account, sync, advertising and analytics data flows, see the Privacy Policy.