Developer Tools

Format JSON, encode Base64 and URLs, generate UUIDs, convert timestamps, hash text, and test regular expressions.

Tools in this category

Open any tool to use it. Nothing is installed or uploaded.

JSON Formatter

Format, minify and validate JSON, with indentation, key sorting and precise error positions.

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Base64 Encoder and Decoder

Encode text to Base64 or decode Base64 back to UTF-8, with URL-safe output and clear validation errors.

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UUID Generator

Generate cryptographically random version 4 UUIDs in batches, with uppercase and hyphen options.

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URL Encoder and Decoder

Percent-encode text for URLs or decode percent-encoded strings, with optional form-style plus signs for spaces.

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Unix Timestamp Converter

Convert Unix timestamps in seconds or milliseconds to dates and back, with ISO, UTC and local time.

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Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes of text locally in your browser.

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Regex Tester

Test JavaScript regular expressions against your text, with flags, match positions, capture groups and highlighting.

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About this category

Developer tools are the ones you reach for while debugging: pretty-printing a JSON payload, checking a Base64 string, generating a UUID, or confirming what a timestamp means in local time. Each tool shows its output in a monospace panel you can copy directly.

Nothing in your input is executed. JSON is parsed, not evaluated, and regular expressions run against your text in the browser with limits on runaway patterns.

JSON formatting, validation, and minification with error positions.
Base64 and URL encoding that handles UTF-8 correctly.
UUID v4 generation through the Web Crypto API, never Math.random().