JSON Randomizer

Generate 1-100 random JSON records for testing, API development, and mock data creation. Customize data types, structure, and export in multiple formats.

Generated JSON

Click "Generate" to create random JSON data

Templates

Settings

About JSON & JSON Randomizer

What is JSON?

JSON (JavaScript Object Notation) is a lightweight, text-based data interchange format. It's easy for humans to read and write, and easy for machines to parse and generate. JSON is language-independent and widely used for data exchange in web applications, APIs, and configuration files.

JSON Data Types:

• String: Text data in double quotes
• Number: Integer or floating-point
• Boolean: true or false
• null: Represents empty value
• Object: Collection of key-value pairs
• Array: Ordered list of values

Why Use a JSON Randomizer?

• API Testing: Generate mock data for testing endpoints
• Development: Create sample data during development
• Database Seeding: Populate databases with test data
• Performance Testing: Generate large datasets for load testing
• Learning: Understand JSON structure and syntax
• Prototyping: Quickly create data models

💡 Pro Tips

API Development

Use our templates to generate realistic API responses and test your frontend applications with consistent mock data.

Database Testing

Generate large datasets to test database performance and validate your data processing logic.

Learning JSON

Experiment with different data structures and naming conventions to better understand JSON syntax and best practices.

Save Templates

Create and save custom templates for your specific use cases to speed up your development workflow.

Random Tools

Random Word Generator

Generate random words for writing prompts, creative exercises, or games with categories like nouns, verbs, adjectives, and compound words. Bulk generation with export options.

Random Quote Generator

Get inspired with random quotes from famous people, organized by categories like motivation, wisdom, and success.

Secure Password Generator

Generate secure passwords and passphrases with various types of strong passwords, passphrases, random passwords and pin codes.

Random Color Generator

Generate random colors with hex codes and explore color theory with interactive color wheels showing complementary, triadic, analogous, and monochromatic colors.

Random Color Picker

Pick random colors from your custom palette. Add, edit, and delete colors, then randomly select one or more for your projects.

Random Security Check

Automatically run random security checks on your web applications to identify vulnerabilities and strengthen your site's overall protection.

Random Name Picker

Easily and randomly select names from any list for giveaways, meetings, or decision-making with our simple selection tool.

Random Decision Maker

Make decisions easily by entering your question and options. Let our random decision maker help you choose when you can't decide.

Random Team Generator

Generate random teams from a list of participants. Perfect for sports, group projects, or any activity requiring balanced team division.

Random List Shuffler

Shuffle any list of items into random order. Perfect for randomizing presentations, playlists, or task orders with visual animation and undo functionality.

JSON Randomizer

Generate random JSON data for testing, API development, and mock data creation. Customize data types, structure depth, templates, and export formats for developers and testers.

Network Analysis

Website Status Checker

Check if a website is down for everyone or just you to ensure your site is always up and accessible to users.

What Is My IP Address?

Find out your IP address and get detailed IP information to help with network troubleshooting and security.

Internet Ping Test

Test the response time and connectivity of any server to ensure reliable network performance and troubleshoot connectivity issues.

DNS Lookup Tool

Look up DNS records and check domain configurations to troubleshoot network issues and improve website performance.

HTTP Request Tester

Free online HTTP request tester for external APIs. Test public REST APIs, send GET, POST, PUT, DELETE requests with custom headers and authentication.

HTTP Status Checker

Check the HTTP status code of any website to ensure it is working properly and accessible to users.

Meta Tag Analyzer

Analyze meta tags of any website to improve your SEO and search engine visibility.

MX Record Checker

Verify email server configurations and mail exchanger records to ensure your email is delivered reliably.

Page Load Time Tester

Measure how fast a webpage loads and analyze performance to improve your website loading speed.

Broken Link Checker

Find broken links on your website automatically to ensure your site is always up to date and user-friendly.

Memory Usage Tracker

Monitor memory usage of your web applications to optimize performance and ensure smooth operation.

SSL Certificate Checker

Check the SSL certificate of any website to ensure it is secure and protected.

Redirect Checker

Check the redirect chain of any website to ensure it is secure and protected.

Parse and analyze XML and TXT sitemaps to view URLs, metadata, search and filter results, and export data.

Management

Try our project management tool to effortlessly manage your to-do lists, organize tasks, boost productivity, and stay on track with your daily goals.

Best Daily Planner

Try the best daily planner we believe to boost productivity with key features like to do list, time-blocking for daily planning.

Time Spent Tracker

Track your time spent on activities, tasks, and projects to help you stay on top of your schedule and improve your productivity.

Set browser notifications for reminders, tasks, and alerts to stay on top of your schedule.

Progress Tracker

Track and manage progress on multiple items with customizable categories, options, and completion percentages in a flexible grid interface.

Visual project management tool to organize and track work through customizable workflow stages with drag-and-drop task management.

Advanced project management with multiple board templates, team collaboration, analytics, and agile workflow support for effective sprint planning.

Track your daily habits, build streaks, and achieve your goals with our comprehensive habit tracker. Monitor progress, set reminders, and stay motivated.

My Passwords List

Securely store and manage your passwords locally in your browser with IndexedDB. Features search, categories, import/export, and strong password generation.

Expense Tracker

Track your expenses, manage categories, set budgets, and monitor your spending with our comprehensive expense tracking tool featuring reports and analytics.

Time Zones

World Time Zones

Find current time in cities and countries around the world with comprehensive timezone information.

Time zones Lookup

Find accurate timezone information for any location worldwide by city or region with reliable, up-to-date data.

Current time in Mountain Daylight Time (MDT) with customizable display options and fullscreen mode.

EST to MST Converter

Convert Eastern Standard Time (EST) to Mountain Standard Time (MST) with interactive time picker, conversion chart, and quick reference.

MST to EST Converter

Convert Mountain Standard Time (MST) to Eastern Standard Time (EST) with interactive time picker, conversion chart, and quick reference.

EST to PST Converter

Convert Eastern Standard Time (EST) to Pacific Standard Time (PST) with interactive time picker, conversion chart, and quick reference.

PST to EST Converter

Convert Pacific Standard Time (PST) to Eastern Standard Time (EST) with interactive time picker, conversion chart, and quick reference.

EST to CST Converter

Convert Eastern Standard Time (EST) to Central Standard Time (CST) with interactive time picker, conversion chart, and quick reference.

CST to EST Converter

Convert Central Standard Time (CST) to Eastern Standard Time (EST) with interactive time picker, conversion chart, and quick reference.

MST to PST Converter

Convert Mountain Standard Time (MST) to Pacific Standard Time (PST) with interactive time picker, conversion chart, and quick reference.

PST to MST Converter

Convert Pacific Standard Time (PST) to Mountain Standard Time (MST) with interactive time picker, conversion chart, and quick reference.

CST to MST Converter

Convert Central Standard Time (CST) to Mountain Standard Time (MST) with interactive time picker, conversion chart, and quick reference.

MST to CST Converter

Convert Mountain Standard Time (MST) to Central Standard Time (CST) with interactive time picker, conversion chart, and quick reference.

CST to PST Converter

Convert Central Standard Time (CST) to Pacific Standard Time (PST) with interactive time picker, conversion chart, and quick reference.

PST to CST Converter

Convert Pacific Standard Time (PST) to Central Standard Time (CST) with interactive time picker, conversion chart, and quick reference.

EST to UTC Converter

Convert Eastern Standard Time (EST) to Coordinated Universal Time (UTC) with interactive time picker, conversion chart, and quick reference.

UTC to EST Converter

Convert Coordinated Universal Time (UTC) to Eastern Standard Time (EST) with interactive time picker, conversion chart, and quick reference.

PST to UTC Converter

Convert Pacific Standard Time (PST) to Coordinated Universal Time (UTC) with interactive time picker, conversion chart, and quick reference.

UTC to PST Converter

Convert Coordinated Universal Time (UTC) to Pacific Standard Time (PST) with interactive time picker, conversion chart, and quick reference.

EST to GMT Converter

Convert Eastern Standard Time (EST) to Greenwich Mean Time (GMT) with interactive time picker, conversion chart, and quick reference.

GMT to EST Converter

Convert Greenwich Mean Time (GMT) to Eastern Standard Time (EST) with interactive time picker, conversion chart, and quick reference.

Timers

Perfect interval timer for workouts, HIIT, Tabata, circuit training, and exercise routines with customizable duration and repetitions.

Set up custom interval timers for workouts or tasks to help you stay focused and productive.

Stay productive with this customizable Pomodoro timer to help you focus and get more done in less time.

Simple, accurate stopwatch for precise timing of any activity, workout, or event with easy-to-use controls.

Countdown Timer

Create countdown timers in hours, minutes, or seconds to track events and deadlines with precision and ease.

Event Countdown Generator

Create countdown timers for events, holidays, and deadlines with customizable options for name, date, time and end description.

Sunrise & Sunset Countdown

Countdown to sunrise and sunset times, helping you plan your day with accurate, real-time daylight tracking.

Countdown to high and low tide times, helping you plan your day with accurate, real-time tide tracking.

Set a 1-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

Set a 2-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

Set a 3-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

Set a 4-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

Set a 5-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

10 Minute Timer

Set a 10-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

15 Minute Timer

Set a 15-minute timer for quick tasks, short breaks, meditation, or any activity that needs precise timing.

20 Minute Timer

Set a 20-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

25 Minute Timer

Set a 25-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

30 Minute Timer

Set a 30-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

35 Minute Timer

Set a 35-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

40 Minute Timer

Set a 40-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

45 Minute Timer

Set a 45-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

50 Minute Timer

Set a 50-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

55 Minute Timer

Set a 55-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

60 Minute Timer

Set a 60-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

90 Minute Timer

Set a 90-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

120 Minute Timer

Set a 120-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

240 Minute Timer

Set a 240-minute countdown timer for longer tasks, workouts, cooking, or extended focus sessions.

Calculator

Calculate your age in years, months, days, hours, minutes, and seconds with our age calculator.

Annual Mileage Calculator

Calculate your annual mileage and estimate fuel costs with our easy-to-use Annual Mileage Calculator.

Calculate your Body Mass Index (BMI) and understand your weight category with our easy-to-use BMI calculator supporting both metric and imperial units.

Calorie Burned Calculator

Calculate calories burned during exercise and daily activities. Uses accurate MET values for over 40 activities including running, cycling, swimming, sports, and household tasks.

Erlang Calculator

Calculate call center staffing needs using Erlang B or Erlang C, factoring call volume, handling time, and service level to fine tune customer wait times.

IP Subnet Calculator

Calculate IPv4 and IPv6 subnets with CIDR notation. Determine network addresses, broadcast addresses, subnet masks, and host ranges for network planning.

Fuel to Distance Calculator

Calculate how far you can travel with a given amount of fuel, or determine how much fuel you need for a specific distance.

Paycheck Calculator

Easily estimate your take-home pay with our free Paycheck Calculator. Calculate net pay after taxes and deductions instantly.

Calculate tips and split bills easily. Perfect for restaurants, service providers, and group expenses with customizable tip percentages.

Day of the Year Calculator

Calculate the day of the year for any date with our easy-to-use tool.

Compound Interest Calculator

Calculate compound interest with additional contributions and compare different investment scenarios with interactive charts.

Savings Goal Calculator

Calculate how much money you need to contribute each month to reach your specific savings goal with compound interest calculations.

Loan Calculator

Calculate loan payments, total interest, and payoff scenarios for personal loans, auto loans, and mortgages. Compare loan options and analyze early payoff benefits.

Mortgage Calculator

Calculate monthly mortgage payments, PMI, amortization schedules, and analyze extra payments. Supports conventional, FHA, and VA loans with comprehensive cost analysis.

Calculate your Grade Point Average with weighted and unweighted systems, semester GPA calculation, and target GPA planning for academic success.

Investment Return Calculator

Calculate returns on stocks, bonds, mutual funds, and other investments. Factor in dividends, fees, taxes, and analyze dollar-cost averaging scenarios.

Watts to kWh Calculator

Convert power in watts (W) to energy in kilowatt-hours (kWh). Calculate energy consumption, electricity costs, and environmental impact for appliances and devices.

Battery Backup Calculator

Calculate battery backup time and required capacity for UPS systems, off-grid power, and emergency backup solutions with comprehensive energy analysis.

Frequency to Wavelength Calculator

Convert frequency to wavelength using λ = c/f formula. Calculate electromagnetic wave properties for radio, microwave, and optical frequencies with different mediums.

Capacitor Color Code Calculator

Decode capacitor color bands to determine capacitance values, tolerance, and specifications. Supports 3, 4, and 5-band capacitors with visual color selection.

Pregnancy Due Date Calculator

Calculate pregnancy due dates from last menstrual period or conception date. Include trimester breakdowns, important milestone dates, appointment schedules, and fetal development information.

Body Fat Calculator

Calculate your body fat percentage using US Navy method and BMI method. Free body fat calculator with comprehensive results, ideal ranges, and health recommendations.

Cubic Yards to Tons Calculator

Convert cubic yards to tons for construction materials, soil, gravel, and more. Free calculator with material densities for accurate volume to weight conversion.

Ohm's Law Calculator

Calculate voltage, current, resistance, and power using Ohm's Law. Free calculator with step-by-step solutions, formulas, Ohm's Law wheel, and educational content about electrical circuits.

Screensaver

A free backlight bleed tester to check dead pixels, backlight bleeding. Test monitor, laptop, mobile screen or other display issues.

Quickly detect dead pixels, screen flicker, or backlight bleed on any monitor with our advanced display testing tool.

Spot dead pixels, color uniformity issues, or backlight bleeding fast-ensure your screen quality with our pixel checker.

Instantly check for dead pixels, backlight bleed, or display defects to guarantee flawless screen performance.

Test your monitor for dead pixels, backlight bleeding, and color inconsistencies in seconds with our display diagnostic tool.

Identify dead pixels, uneven backlighting, or screen defects easily-optimize your monitor's display quality now.

Find and fix dead pixels, backlight bleeding, or display issues using our comprehensive screen testing solution.

Ensure perfect screen quality by detecting dead pixels, backlight bleed, and other monitor issues instantly.

Diagnose dead pixels, backlight bleeding, or display problems quickly-improve your monitor's performance and viewing experience.

Uncover dead pixels, backlight bleed, or screen defects fast with our user-friendly display testing tool.

Verify your screen for dead pixels, backlight bleeding, or color issues to maintain top display performance.

Easily detect dead pixels, backlight bleed, and other screen issues to ensure your display's optimal quality.

Quickly identify and troubleshoot dead pixels, backlight bleeding, and display defects for a flawless viewing experience.

Display the local time on your screensaver, automatically adjusting to your current time zone for accurate, real-time clock display.

A screensaver that displays the current date and time. Real-time clock display on your desktop or device.

Elegant clock screensaver displaying the current time with customizable styles, perfect for adding a sleek look to your screen.

Engineering

Voltage Divider Calculator

Calculate output voltage, resistor values, power dissipation, and current for voltage divider circuits used in electronics and engineering.

Resistor Color Code Calculator

Decode resistor color bands to determine resistance values, tolerance, and power ratings for 4, 5, and 6-band resistors with visual representation.

Capacitor Value Calculator

Convert capacitor marking codes to values in pF, nF, and µF. Support for 3-digit codes, tolerance letters, and reverse lookup from value to code.

Wire Gauge Converter

Convert between AWG, millimeters, inches, square mm, square inches, and circular mils. Complete AWG chart with current ratings and resistance values.

Wave Frequency Calculator

Calculate wave frequency, wavelength, and speed using f=v/λ. Support for electromagnetic waves, sound waves, and custom mediums with unit conversions.

Fourier Series Visualizer

Interactive tool for visualizing Fourier series decomposition with real-time coefficient calculation, animation, and function approximation for signal analysis.

Sampling & Nyquist Calculator

Calculate Nyquist rate, check sampling sufficiency, analyze aliasing, and compute oversampling ratios for signal processing applications.

Beam Deflection Calculator

Calculate maximum deflection for simply supported and cantilever beams with point loads or distributed loads. Includes structural engineering formulas and design guidelines.

Bolt Torque Calculator

Calculate proper tightening torque for bolts based on material grade, preload requirements, and friction coefficients. Includes safety checks and engineering formulas.

Gear Ratio Calculator

Free professional gear ratio calculator for mechanical engineering. Calculate speed reduction, torque multiplication, compound gear trains, and mechanical advantage with real-time formulas and step-by-step solutions.

Molar Mass Calculator

Calculate molar mass and analyze chemical formulas with detailed elemental breakdown. Supports complex formulas, hydrates, parentheses, and provides mass percentages for chemistry applications.

Ideal Gas Law Calculator

Calculate pressure, volume, temperature, or moles using the ideal gas law (PV = nRT). Free calculator with multiple units, step-by-step solutions, and educational content for chemistry and physics.

Op-Amp Calculator

Calculate operational amplifier circuit parameters for inverting, non-inverting, differential, and integrator/differentiator configurations. Include gain, input/output impedance, and bandwidth calculations.

Heat Transfer Calculator

Calculate heat transfer rates for conduction, convection, and radiation. Include thermal resistance, heat exchanger analysis, and cooling calculations for engineering applications.

Transformer Turns Calculator

Calculate transformer turns ratios, primary/secondary voltages, currents, and power relationships. Include step-up/step-down calculations, impedance transformation, and efficiency calculations.

Power Electronics Calculator

Design and analyze DC-DC converters (buck, boost, buck-boost), calculate switching frequencies, inductor/capacitor values, and efficiency for power supply design.

Motor RPM Calculation

Calculate motor rotational speed from Hall-effect sensors, encoders, tachometers, and back-EMF measurements. Includes filtering, calibration, and performance analysis for motor control applications.

KVAR Calculator

Calculate required reactive power (KVAR) for power factor correction, capacitor bank sizing, and energy savings analysis for electrical systems and industrial applications.

HP to kW Motor Converter

Convert between horsepower (HP) and kilowatts (kW) for mechanical, electrical, and metric motor ratings with efficiency and load adjustments for engineering applications.

Utilities

Quickly test your webcam and verify camera settings to ensure optimal video quality and proper device functionality.

Microphone Test

Test your microphone and verify settings to ensure clear audio quality and proper device performance for free.

Flashlight Tester

Test your flashlight and verify settings to ensure optimal lighting and proper device functionality for free.

Morse Code Translator

Free online Morse code generator. Convert text to Morse code, e.g.: SOS in morse code, and vice versa.

View, edit, and manage your browser cookies effortlessly to control privacy, enhance security, and customize your browsing experience.

Credit Card Number Validation

Validate credit card numbers using the Luhn algorithm to ensure they are valid and secure.

Online Tally Counter

Free online tally counter with multiple counters, labels, and total calculation. Perfect for counting, tracking, and tallying various items.

Spacebar Counter

Simple spacebar counter - press spacebar or click + button to count. Perfect for counting repetitions, events, or any activity.

Password Strength Tester

Test your password strength and learn how secure your password is. Get real-time feedback and tips to create stronger passwords.

Website Screenshot

Generate screenshots of websites by entering a URL, with options for different device viewports (mobile, tablet, desktop) and full-page captures.

Printable

Printable Calendar

Generate and download printable monthly calendars for any month and year. Perfect for planning, organizing, and printing.

January 2025 Calendar

Generate and download printable January 2025 Calendar. Perfect for planning, organizing, and printing.

February 2025 Calendar

Generate and download printable February 2025 Calendar. Perfect for planning, organizing, and printing.

March 2025 Calendar

Generate and download printable March 2025 Calendar. Perfect for planning, organizing, and printing.

April 2025 Calendar

Generate and download printable April 2025 Calendar. Perfect for planning, organizing, and printing.

May 2025 Calendar

Generate and download printable May 2025 Calendar. Perfect for planning, organizing, and printing.

June 2025 Calendar

Generate and download printable June 2025 Calendar. Perfect for planning, organizing, and printing.

July 2025 Calendar

Generate and download printable July 2025 Calendar. Perfect for planning, organizing, and printing.

August 2025 Calendar

Generate and download printable August 2025 Calendar. Perfect for planning, organizing, and printing.

September 2025 Calendar

Generate and download printable September 2025 Calendar. Perfect for planning, organizing, and printing.

October 2025 Calendar

Generate and download printable October 2025 Calendar. Perfect for planning, organizing, and printing.

November 2025 Calendar

Generate and download printable November 2025 Calendar. Perfect for planning, organizing, and printing.

December 2025 Calendar

Generate and download printable December 2025 Calendar. Perfect for planning, organizing, and printing.