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Mock Data Generator

Build a table of realistic-looking fake data for testing and demos: choose the columns, the number of rows and the output format.

All data is invented. Names, addresses and other values are randomly combined and are not real people. Emails use reserved example domains and phone numbers use ranges set aside for drama and testing, so they should not reach real people — but never use fake data to impersonate anyone. Nothing leaves your browser.

Using the generated data

Pick a type for each column and name it as you like (the name becomes the JSON key, CSV header or SQL column). Custom list picks at random from the comma-separated options you enter, and Number uses the minimum and maximum you give. Enter a seed to get the same rows every time — handy for repeatable tests. Values are generated from small built-in lists of common British and international names, cities and words.

Postcodes are made in the right pattern (for example M1 4BT) but are random, so they may not exist. For a single fake person, see the random person generator; for placeholder text use the Lorem Ipsum generator.

MIME Type Lookup

Look up the MIME type (Content-Type) for any file extension, or find the extensions for a MIME type. Searchable list of common types.

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Common Ports Lookup

Look up well-known TCP and UDP port numbers and the services that use them, such as 22 SSH, 443 HTTPS and 3306 MySQL.

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XML to JSON Converter

Convert XML to JSON with clear error messages: choose attribute and text naming, keep arrays, and convert numbers. Runs in your browser.

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Cron Schedule Simulator

Next runs of a cron expression in server, UTC and your time zone, with skipped and repeated times at daylight saving changes.

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Server Region Latency Estimator

Estimate the theoretical round-trip time from your users to AWS, Google Cloud and Azure regions from distance alone, as a range. No pings, no measurements.

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JSON Formatter & Validator

Format, validate, and beautify JSON, with clear error messages.

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Running into a technical issue or something that doesn't work right on this page? Please let us know straight away via our Contact page — that's how we find out what's broken and get it fixed.