JavaScript & Developer Tools

Everyday utilities for JavaScript and full-stack developers: format and validate JSON, convert data, encode strings, test regular expressions and generate identifiers.

21 free tools

All Developer Tools

  • Base64 Decoder

    Decode Base64, base64url and data URIs back to text or files, with error positions, a hex view and file type detection.

    JavaScript

  • Base64 Encoder

    Encode text or files to Base64 with correct UTF-8 handling, URL-safe output, MIME line wrapping and ready-to-use data URIs.

    JavaScript

  • Character Counter

    Count characters, bytes and words and check limits for meta tags, X posts, SMS, Instagram and YouTube titles.

    Utilities

  • CSV to JSON Converter

    Convert CSV or TSV into JSON with a standards-compliant parser, delimiter detection, type inference and several output shapes.

    JavaScript

  • Hash Generator

    Calculate MD5, SHA-1, SHA-256, SHA-384 and SHA-512 hashes and HMACs of text or files, and verify checksums.

    JavaScript

  • JSON Formatter

    Format, beautify and validate JSON with readable indentation, key sorting and clear error messages.

    JavaScript

  • JSON Minifier

    Strip whitespace from JSON to make it as compact as possible, with byte savings, key sorting and a .min.json download.

    JavaScript

  • JSON to CSV Converter

    Turn JSON arrays into CSV for Excel or Google Sheets, with nested-object flattening, array handling and a live table preview.

    JavaScript

  • JSON Validator

    Check JSON syntax as you type, pinpoint errors with a code excerpt and catch duplicate keys that JSON.parse silently drops.

    JavaScript

  • JSON Viewer

    Explore JSON as a collapsible, color-coded tree with search, expand-to-level controls and one-click path copying.

    JavaScript

  • Lorem Ipsum Generator

    Generate classic lorem ipsum placeholder text as paragraphs, sentences, words or list items, in plain text or HTML.

    JavaScript

  • Password Generator

    Create strong random passwords or memorable passphrases with secure browser randomness and an honest strength estimate.

    JavaScript

  • Random Number Generator

    Generate secure random integers or decimals in any range, with unique numbers, sorting, dice, coin flip and lottery presets.

    Utilities

  • Random String Generator

    Generate cryptographically secure random strings, tokens, API keys, hex IDs and PINs with custom characters and length.

    JavaScript

  • Regex Tester

    Test JavaScript regular expressions live with match highlighting, capture groups, replace preview and a library of common patterns.

    JavaScript

  • String Case Converter

    Convert identifiers between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE and 9 more, with smart acronym handling.

    JavaScript

  • Timestamp Format Converter

    Convert any date string or timestamp between ISO 8601, RFC 2822, RFC 3339, HTTP, SQL and Unix formats in any time zone.

    JavaScript

  • Unix Timestamp Converter

    Convert Unix epoch timestamps to human-readable dates and back, with a live clock and auto-detected seconds, ms, µs or ns.

    JavaScript

  • URL Decoder

    Decode percent-encoded text and URLs, unwrap double encoding, locate malformed sequences and break a URL into its parts.

    JavaScript

  • URL Encoder

    Percent-encode text for query strings, paths, full URLs or form data, with a table showing exactly which characters changed.

    JavaScript

  • UUID Generator

    Generate secure random v4 or time-ordered v7 UUIDs in bulk, and validate or inspect any UUID.

    JavaScript

Fast utilities that stay out of your way

These tools process input in your browser as you type. They are built for the moments when you need to inspect an API response, decode a token payload, or check a regular expression without opening an editor or installing a package.

Frequently Asked Questions

Is my JSON or text uploaded anywhere?

No. The developer tools on this page process input with JavaScript in your browser. Input is not sent to a server and is not saved between visits.

Which hash algorithms are supported?

The Hash Generator supports MD5, SHA-1, SHA-256, SHA-384 and SHA-512. MD5 and SHA-1 are provided for checksums and legacy systems only — do not use them for passwords.

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