Dev tools · alternatives · 2026
24 alternatives to Big List of Naughty Strings for testing user-input data
The Big List of Naughty Strings is a list of strings which have a high probability of causing issues when used as user-input data. - minimaxir/big-list-of-naughty-strings
Big List of Naughty Strings is a dev tool that provides a collection of problematic input strings for testing software systems. It helps developers identify how their applications handle edge cases, special characters… Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Big List of Naughty Strings for testing user-input data launched in 2015; newer entries below may have overtaken it.
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Strings which have a high probability of causing issues
2015 · github.com · its alternatives →
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I made a free tool that stuns LLMs with invisible Unicode characters. *Use cases:* Anti-plagiarism, text obfuscation against LLM scrapers, or just for fun! Even just one word's worth of “gibberified” text is enough to block most LLMs from responding coherently.
Nov 2025 · gibberifier.com · its alternatives →
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A fast and memory-optimized string library for C++ - btwael/SuperString
2018 · github.com · its alternatives →
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Go library that provides fuzzy string matching optimized for filenames and code symbols in the style of Sublime Text, VSCode, IntelliJ IDEA et al. - sahilm/fuzzy
2018 · github.com · its alternatives →
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Rapid fuzzy string matching in Python using various string metrics - rapidfuzz/RapidFuzz
2020 · github.com · its alternatives →
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Hello HN! I became frustrated with the unpredictible/poor match quality and opaqueness of "relevance scores" in existing fuzzy and fulltext search libs, so I tried something different and this is the result. The main selling point is the result quality / ordering, with best-in-class memory overhead and excellent performance being bonuses. The API is pretty stable at this point, but looking for feedback before committing to 1.0. TL;DR The test corpus is a 4MB json file with 162k words/phrases, so give it a second for initial download. You can also drag/drop your own…
2022 · github.com · its alternatives →
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the JS/Node.JS library for encoding complex and unconventional data structures. Support for BigInts, TypedArrays, null, undefined, and Symbol. Multiple flavors available. - DO-SAY-GO/WeirdJSON
2020 · github.com · its alternatives →
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A convenient C string API, friendly alongside classic C strings.
2022 · github.com · its alternatives →
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SIMD-accelerated UTF-8 validation for Rust. Contribute to rusticstuff/simdutf8 development by creating an account on GitHub.
2021 · github.com · its alternatives →
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2013 · tamber.com · its alternatives →
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A robust Python tool for text-based AI training and generation using GPT-2. - minimaxir/aitextgen
2020 · github.com · its alternatives →
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A very fast library for validating UTF-8 using AVX2/SSE4 instructions - zwegner/faster-utf8-validator
2019 · github.com · its alternatives →
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Short and Sweet▲103Accessible character counter for input elements 📟
2018 · github.com · its alternatives →
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Every product that allows usernames eventually ships the same broken solution. Someone adds a blacklist. Then a regex. Then another regex copied from StackOverflow. It works just long enough to ship, and then `admin`, `support`, city names, brand impersonation, and obvious slurs start leaking through anyway. Everyone knows it’s fragile, but it gets ignored because "it’s just usernames". I’ve had to rebuild this logic across multiple products, and I got tired of pretending it’s a solved problem. So I built *username.dev*, an API that answers a more useful question than "is this taken?" — it…
Dec 2025 · username.dev · its alternatives →
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We've been building data pipelines that scrape websites and extract structured data for a while now. If you've done this, you know the drill: you write CSS selectors, the site changes its layout, everything breaks at 2am, and you spend your morning rewriting parsers. LLMs seemed like the obvious fix — just throw the HTML at GPT and ask for JSON. Except in practice, it's more painful than that: - Raw HTML is full of nav bars, footers, and tracking junk that eats your token budget. A typical product page is 80% noise. - LLMs return malformed JSON more often than you'd expect, especially with…
Mar 2026 · github.com · its alternatives →
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A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration) - blechschmidt/massdns
2016 · github.com · its alternatives →
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2020 · ku.ag · its alternatives →
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Supporting your devops by shortening your strings using common abbreviations and clever guesswork - dnnrly/abbreviate
2018 · github.com · its alternatives →
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I want to share a really dumb, but very practical project I have packaged this summer, to perform operations on strings much faster. I was using Python to work with a multi-terabyte newline-delimited file. Reading, splitting, and shuffling it was a nightmare. So, I wrapped a trivial hardware-friendly heuristic I've been using for the last few years into a CPython library. The part I enjoyed the most is implementing SIMD behavior without SIMD instructions... Using 64-bit words to work at 8-bit granularity. Unlike conventional SIMD, the code would remain the same for ~~almost~~ any hardware.…
2023 · ashvardanian.com · its alternatives →
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2012 · millionshort.com · its alternatives →
- 23AS
Took a stab at building my own string diffing JS package. I built an interactive demo for TypeIt’s website (https://typeitjs.com/build-your-own) a while back. The approach I took to handle user input necessitated a way to calculate the difference between the versions of a user’s text input. I searched around for a package to help me out and found a couple of good ones (like fast-diff), but I either didn’t really like their API or didn’t want to take on a huge new dependency. Instead, I thought I’d give it a shot myself (famous last words). I dove into it having no real formal…
2022 · its alternatives →
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Weird JSON▲19the JS/Node.JS library for encoding complex and unconventional data structures. Support for BigInts, TypedArrays, null, undefined, and Symbol. Multiple flavors available. - DO-SAY-GO/WeirdJSON
2022 · github.com · its alternatives →
Also compare
- Big List of Naughty Strings alternatives
- Stun LLMs with thousands of invisible Unicode characters alternatives
- SuperString – A fast and memory-optimized string library for C++ alternatives
- Strings alternatives
- A fast, hopefully accurate, fuzzy matching library written in Go alternatives
- RapidFuzz – A fast string matching library for Python alternatives
Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →