Developer Tools

15 tools

Free developer tools for everyday data work — format, minify, and validate JSON, SQL, HTML, CSS, and JavaScript, explore JSON as a tree, and convert between CSV and JSON. Everything runs in your browser, so code and payloads never leave your device.

JSON

Format, minify, validate, view, and edit JSON, or convert it to CSV — everything runs in your browser, so payloads with real data stay private.

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CSV

Work with CSV exports in the browser — convert spreadsheet data to JSON with correct handling of quotes, commas, and multi-line fields.

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SQL

Make SQL readable — format queries with consistent keyword casing and indentation, or collapse them to a single line for logs and diffs.

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HTML

Clean up HTML markup — pretty-print for readability or minify for production, with comments and whitespace stripped safely.

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CSS

Tidy stylesheets — format CSS for review or minify it for smaller page weight, preserving exactly what the browser sees.

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JavaScript

Format JavaScript with Prettier conventions or minify it with Terser — the same engines used in real build pipelines, run locally.

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