Free Online Developer Tools

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JSON Formatter

Format, validate, and minify JSON with syntax highlighting

⇋

JSON Diff

Compare two JSON objects and see structural differences highlighted

JWT

JWT Decoder

Decode and inspect JSON Web Token headers and payloads

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Regex Tester

Test regular expressions with real-time match highlighting

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Cron Expression Parser

Parse cron expressions into plain English with next run times

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Chmod Calculator

Calculate Linux file permissions with visual editor and octal/symbolic conversion

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Hash Generator

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes

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UUID Generator

Generate random UUIDs (v4) with one click

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Password Generator

Generate strong, secure random passwords with customizable length and character options.

QR

QR Code Generator

Generate QR codes for URLs, text, WiFi, and more. Download as PNG.

IP

IP Address Lookup

Find your public IP and look up geolocation for any IP address.

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JSON Validator

Validate JSON data with detailed error messages, line numbers, and syntax highlighting.

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CSS Box Shadow Generator

Generate CSS box-shadow with a visual editor. Preview in real-time, copy the CSS code.

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CSS Gradient Generator

Create beautiful CSS gradients with a visual editor. Linear, radial, and conic gradients with real-time preview.

XML

XML Validator

Validate XML syntax and check for well-formedness errors.

AES

AES Encryption

Encrypt and decrypt text using AES-256 encryption in your browser.

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XPath Tester

Test and evaluate XPath expressions against XML documents.

YML

YAML Validator

Validate YAML syntax and check for errors with detailed error messages.

🌐

IP Subnet Calculator

Calculate subnet masks, network ranges, CIDR notation, and IP address details.

⏰

Crontab Generator

Build cron expressions visually with a human-readable schedule preview.

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JSONPath Tester

Test JSONPath expressions against JSON data with live results.

📡

HTTP Status Code Reference

Complete HTTP status code reference with descriptions, use cases, and search.

🎨

Color Palette Generator

Generate harmonious color palettes from any base color — complementary, analogous, triadic, and more.

🖼️

Base64 Image Decoder

Decode Base64 strings to viewable images, or encode images to Base64 data URIs.

📝

Gitignore Generator

Generate .gitignore files for any language, framework, or IDE.

🎲

Random Number Generator

Generate random numbers, pick random items from a list, roll dice, or flip coins.

🧾

Invoice Generator

Create professional invoices and download as PDF — free, no signup required.

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Color Picker

Pick colors visually and get HEX, RGB, HSL, and CMYK values. Extract colors from any image.

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JSON Escape & Unescape

Escape and unescape JSON strings — handle special characters, quotes, newlines, and Unicode for safe embedding in JSON.

URL

URL Parser

Parse any URL into its components — protocol, host, port, path, query parameters, and fragment.

UTC

Epoch Converter

Convert Unix/Epoch timestamps to human-readable dates and vice versa. Supports seconds and milliseconds.

cURL

cURL to Code Converter

Convert cURL commands to code in JavaScript (fetch), Python (requests), Node.js (axios), PHP, Go, and more.

Developer Tools