Developer Tools

30 tools

Free online developer tools — fast, private, and easy to use. No sign-up required.

JSON Formatter & Validator

Format, validate, and minify JSON instantly. Includes syntax highlighting, error detection, and a collapsible tree view — free, private, in-browser.

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Regex Tester

Test and debug regular expressions online. See live matches, capture groups, and replace output. Free, private, instant.

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Base64 Encoder & Decoder

Encode text or files to Base64, or decode Base64 strings back to text. Fast, free, and runs entirely in your browser.

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URL Encoder / Decoder

Encode and decode URLs and URL components online. Convert special characters to percent-encoding and back instantly — free, private, and fast.

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HTML Encoder / Decoder

Encode and decode HTML entities online. Escape <, >, &, and quote characters for safe HTML display. Free, instant, and private — runs in your browser.

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Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes online. Hash text or files privately in your browser.

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Hash Generator

Generate cryptographic hashes online. Support for SHA-1, SHA-256, SHA-384, and SHA-512. Instant, secure, client-side.

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Number Base Converter

Convert numbers between binary, octal, decimal, and hexadecimal instantly. Essential tool for programmers and developers.

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UUID Generator

Generate random UUID v4, timestamp-based UUID v1, and ULID identifiers. Bulk-generate up to 100 at once and copy them instantly — free and private.

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JWT Decoder

Decode and inspect JSON Web Tokens (JWT) online. View header, payload, and expiry. 100% client-side — your token never leaves your browser.

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Unix Timestamp Converter

Convert Unix timestamps to human-readable dates and vice versa. Supports seconds and milliseconds. Shows UTC, local, and ISO 8601 formats.

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JSON to CSV Converter

Convert JSON arrays to CSV format online. Supports nested objects, custom delimiters, and CSV to JSON conversion. Free and private.

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Meta Tag Generator

Generate SEO meta tags, Open Graph tags, and Twitter Card tags online. Preview Google search snippet and copy all tags instantly.

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XML Sitemap Generator

Generate a valid XML sitemap for your website. Add your URLs, set change frequency and priority, then download the sitemap.xml.

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CSS Minifier & Beautifier

Minify and beautify CSS code online. Reduce CSS file size by removing whitespace and comments. Free online CSS minifier with instant results.

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Regex Tester

Test and debug regular expressions online. Live matching with capture groups, flags, and a quick regex reference.

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YAML ↔ JSON Converter

Convert YAML to JSON and JSON to YAML online. Validate syntax instantly with error messages. Free, private converter that runs in your browser.

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SQL Formatter

Format and beautify SQL queries online. Adds line breaks, indentation, and keyword casing for readable queries. Free SQL beautifier in your browser.

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Cron Expression Generator

Build and decode cron expressions online. Get a plain-English description of any crontab schedule and a field-by-field breakdown. Free cron generator.

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JSON to TypeScript Types

Convert JSON to TypeScript interfaces online. Infers types, nested objects, and arrays automatically. Free, private JSON-to-TS generator in your browser.

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XML Formatter

Format and beautify XML online with proper indentation. Pretty print or minify XML and validate basic structure. Free XML formatter in your browser.

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Slug Generator

Convert any text or title into a clean URL slug. Lowercases, removes accents and special characters, and joins words with hyphens. Free slugify tool.

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Chmod Calculator

Calculate Unix file permissions with an interactive chmod calculator. Convert between octal (755) and symbolic (rwxr-xr-x) notation instantly. Free online.

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.gitignore Generator

Generate a .gitignore file for your project. Pick languages, frameworks, and tools to build a ready-to-use git ignore file. Free and private.

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cURL Converter

Convert a curl command to JavaScript fetch, Node, Python requests, or PHP. Paste your curl and get clean client code instantly. Free and private.

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Bcrypt Hash Generator & Checker

Generate bcrypt password hashes and verify a password against a hash online. Adjustable cost factor. Free, private bcrypt tool in your browser.

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TOTP / 2FA Code Generator

Generate time-based one-time passwords (TOTP) from a secret key online. Compatible with Google Authenticator and 2FA. Free, private TOTP generator.

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robots.txt Generator

Generate a robots.txt file for your website. Set user-agents, allow/disallow rules, crawl-delay, and sitemap URL. Free, private robots.txt builder.

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.htaccess Redirect Generator

Generate .htaccess redirect rules online. Create 301/302 redirects, www and HTTPS forcing, and RewriteRule snippets for Apache. Free and private.

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JSON Schema Validator

Validate JSON data against a JSON Schema online. Get clear, path-based error messages for every violation. Free, private JSON Schema validator.

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About Developer Tools

Essential tools for web and software developers: JSON formatter, Base64 encoder, URL encoder/decoder, regex tester, timestamp converter, UUID generator, hash generator, and more.

All developer tools on ToolsHub are completely free and require no account or registration. Your data stays private because processing happens directly in your browser — nothing is sent to our servers.

Whether you're a professional, student, or casual user, our developer tools are designed to be fast, accurate, and easy to use on any device.