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Developer Tools

17 tools

Free developer tools: format and validate JSON, encode or decode Base64 and URLs, and generate MD5/SHA hashes — all client-side and instant.

JSON Formatter & Viewer Paste JSON to beautify, validate and explore it in a live collapsible tree — with search, expand/collapse and JSONPath.
Base64 Encode / Decode Convert text to and from Base64. Everything runs in your browser and is UTF-8 safe.
URL Encode / Decode Percent-encode text for safe use in URLs, or decode an encoded URL back to readable text.
Hash Generator Type text to instantly generate MD5, SHA-1, SHA-256 and SHA-512 hashes.
JWT Decoder Paste a JWT to decode its header and payload and check its expiry.
Regex Tester Enter a regular expression and a test string to see live matches and capture groups.
SQL Minifier Strip comments and collapse whitespace to compress SQL into a single line.
JSON Validator Paste JSON to check if it is valid; invalid JSON shows the exact error.
SQL Formatter Paste SQL to get a clean, indented, readable query.
HTML Beautifier Paste minified or messy HTML to get clean, indented markup.
CSS Beautifier Paste minified CSS to get clean, indented, readable styles.
JavaScript Beautifier Paste minified or messy JavaScript to get clean, indented, readable code.
CSS Minifier Strip comments and whitespace to compress your CSS.
HTML Minifier Remove comments and collapse whitespace to compress your HTML.
Cron Expression Generator Build a cron expression from a schedule, or paste one to read it in plain English.
Robots.txt Generator Build a robots.txt to control how search engines crawl your site.
Meta Tag Generator Enter your page details to generate SEO and Open Graph meta tags.

About our Developer Tools

A focused set of everyday utilities for developers: a JSON formatter with a live collapsible tree, Base64 and URL encoders/decoders, and a hash generator for MD5, SHA-1, SHA-256 and SHA-512.

Everything is computed in your browser using native browser APIs, so even sensitive input stays on your device and results are instant.