fent/randexp.js

Health v2 · maintenance only

Adoption not part of the score

1867 stars · 94 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

A JavaScript library that generates random strings matching a given regular expression. It supports grouping, ranges, references, custom character ranges, and pluggable PRNGs, working in Node.js and browsers.

Use cases

• generate random strings matching a regex
• create test data for form validation
• generate sample input for regex-based parsers
• seeded random string generation for reproducible tests
• generate mock usernames or identifiers from a pattern

When to choose

• you need test fixtures or mock data shaped by a regex pattern
• you want a small, dependency-free Node or browser library for random string generation
• you need custom character ranges or a seedable PRNG

When to avoid

• you need general-purpose fake data like names, addresses, or emails (use a faker library)
• your regexes use lookaheads or other constructs randexp cannot expand
• you need cryptographically secure output without supplying your own PRNG

Facets

library · maturity stable

data-generation testing parser developer-tools testing browser regex random-string-generation test-data mock-data automation nodejs javascript

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