Generate Data
Faker
DataConstruct
Beeceptor
Fake Data
ExtendsClass JSON Generator
Smock-it
A realistic data generator to test your app
SQL Fiddle
ExtendsClass SQL Online
DB Fiddle
V (programming language)
Online SQL Editor
explainshell
db<>fiddle
Online compiler for many languages, including MySQL

Which is more popular?
Based on our record, Mockaroo should be more popular than Rextester. It has been mentioned 27 times since March 2021.
Website, pricing, platforms and company facts side by side.
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Rextester
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| Website | mockaroo.com | insurance.rextester.com |
| Pricing | — | |
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What each product offers, as listed by its team.
Possible disadvantages
No features have been listed yet.
Walkthroughs and reviews on video.
Best Free Sample Data Generator - Mockaroo.com
More videos
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How often each product is chosen within a category, 0–100% relative to the other.
Share your experience with using Mockaroo and Rextester. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.
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It supports around 30 languages including Java, but it is more popular among C# users. Rextester started as a Regular Expression Tester, later grew to be an online IDE.
Recommendations tracked on public social media and blogs since March 2021.
If you give it the rules to generate something, why can't it generate it? That's what something like Mockaroo[0] does. It's just more formal. That's pretty much what LLM training does, extracting patterns from a huge corpus of text. Then... - Source: Hacker News / over 1 year ago
A quick way to test this out is to use a tool like Mockaroo to generate some test data and then have a Glue Crawler analyse the data in S3 and create the required data catalog entries. - Source: dev.to / over 2 years ago
Mockaroo — Mockaroo lets you generate realistic test data in CSV, JSON, SQL, and Excel formats. You can also create mocks for back-end API. - Source: dev.to / over 2 years ago
My Professor has not provided any resources or material to help complete this project, I have tried to problem solve, use the internet, even chatgpt. (I can send the code that it gave me in comments if needed, but ) I need help... Source: over 3 years ago
Does it really do that? (I've just tried in rextester.com, it complains about declared but unused variables.). Source: over 3 years ago
(A quick survey of some of the languages at rextester.com showed that they are usually counted from 1. I'd suggest doing the same would be least surprising.). Source: over 4 years ago
When comparing Mockaroo and Rextester, you can also consider the following products.

GenerateData.com: free, GNU-licensed, random custom data generator for testing software
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A tool for easy online testing and sharing of database problems and their solutions.
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Faker is a PHP library that generates fake data for you
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Online SQL playground for testing and sharing SQL snippets. SQLite, MySQL and PostgreSQL.
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An online tool for testing, sharing and collaborating on SQL snippets
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