Big List of Naughty Strings
Big List of Naughty Strings collects unusual input strings that may trigger issues in software handling user data.
About Big List of Naughty Strings
The Big List of Naughty Strings is an evolving list of strings which have a high probability of causing issues when used as user-input data. It is intended for automated and manual QA testing to help reveal string-validation issues. Use is intended for software you own and manage. It is not a fully-comprehensive substitute for formal security testing.
Pricing is not clearly stated.
Key features
- Newline-delimited blns.txt with # comments dividing strings into sections for manual reading and copy-pasting
- blns.json array with comments stripped for programmatic access, generated by a Python script in the scripts folder
Best for: People doing automated and manual QA testing of user input
Big List of Naughty Strings at a glance
- Category
- Development › Developer Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Details verified
- Oct 22, 2026 · Official source
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 5, 2026 · Online when checked
- Listed
- Oct 5, 2026
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