# imbrn/v8n

☑️ JavaScript fluent validation library

Repository: https://github.com/imbrn/v8n
Canonical: https://ross.abutalabs.com/products/v8n
Homepage: https://imbrn.github.io/v8n
Language: JavaScript
License: MIT
License Family: permissive
Topics: javascript, validation, library
Last push: 2025-01-01T14:55:40+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 2991, "days_push": 609, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 4143, forks 105 (observed 2026-08-28T04:08:36.333337+00:00)

## What it is
v8n is a fluent, chainable JavaScript validation library for validating any kind of data, from primitives to objects and arrays. It offers 30+ built-in rules, custom rule extension, async validation, and reusable validation schemas with TypeScript support.

## Use cases
- validate user form input in javascript
- check that a string matches length and character rules
- validate arrays of numbers with fluent chaining
- create reusable custom validation rules
- run asynchronous data validation
- validate api request payloads in nodejs

## When to choose
- you want a readable, English-like chainable validation API
- you need lightweight validation without a form framework
- you want to define and reuse custom validation rules across modules
- you need both sync and async validation strategies

## When to avoid
- you need schema-based validation with type inference like zod or joi
- you are validating complex nested object schemas with detailed error reporting
- your project requires a library with frequent maintenance releases

## Facets
- artifact type: library
- maturity: stable
- function: testing, developer-tools
- domain: web-development, developer-tools, frontend
- platform: browser, cross-platform
- tags: validation, fluent-api, chainable, typescript-support, data-validation, nodejs

## Member repositories
- imbrn/v8n (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:08:36.333337+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:22:58.075931+00:00, confidence not recorded.
  - readme: https://github.com/imbrn/v8n (fetched 2026-08-28T04:08:36.333337+00:00, sha c03fc6b9de3c)
  - homepage: https://imbrn.github.io/v8n (fetched 2026-08-29T09:14:13.384555+00:00, sha 12dc8dca6fd1)
  - site_page: https://imbrn.dev/v8n/Installation.html (fetched 2026-08-29T09:14:13.393432+00:00, sha 8487f6d739b8)
  - registry_npm: https://registry.npmjs.org/v8n (fetched 2026-08-29T09:14:13.395098+00:00, sha e7d1157d63fb)
- Data as of 2026-08-30T08:39:29.467469+00:00.