Registry / testing / json-schema-fast-check

json-schema-fast-check

library0.0.6jsnpmunverified

Generate fast-check arbitraries from JSON Schema for property-based testing. Version 0.0.6, early stage development with limited schema support (subset of JSON Schema). Differentiates by directly integrating JSON Schema with fast-check, enabling property-based tests that automatically generate valid inputs based on schema definitions. Supports faker-js sugar for realistic data. Not production-ready; many JSON Schema features missing (minProperties, if/then/else, oneOf, dependencies as objects).

testing

npm install json-schema-fast-check

package ↗

INSTALL

IMPORT

SIG · JSON-SCHEMA-FAST-C

json-schema-fast-check

testingjavascriptv0.0.6

harness data pending

Install & Compatibility

Where this runs

No compatibility data collected yet for this library.

Code

Verified usage

Verified import paths — ran on the pinned version, not inferred.

default

✓ import jsfc from 'json-schema-fast-check'

✗ const jsfc = require('json-schema-fast-check')

Default export is the main function. ESM-only.

generate

✓ import { generate } from 'json-schema-fast-check'

Named export for single generation. Can also be imported as a property of default.

✓ import fc from 'fast-check'

✗ import { fc } from 'fast-check'

Separate package required. fc is default export from fast-check.

Property-based test that validates all generated objects from schema satisfy constraints.

import jsfc from 'json-schema-fast-check'; import fc from 'fast-check'; const schema = { type: 'object', properties: { name: { type: 'string' }, age: { type: 'integer', minimum: 0 } }, required: ['name'] }; fc.assert( fc.property(jsfc(schema), (obj: any) => { return typeof obj.name === 'string' && (obj.age === undefined || obj.age >= 0); }) );

Debug

Known issues

deprecatedSchema features like minProperties, if/then/else, oneOf are not implemented.

fix

Avoid using unimplemented schema constructs or use alternative library like json-schema-faker or quicktype.

affects: >=0.0.1

gotchaDefault export name is arbitrary; import as any name you want.

fix

Import default as jsfc or any other name: import YourName from 'json-schema-fast-check'.

affects: >=0.0.1

gotchaSchema with dependencies as objects not supported.

fix

Only use array-style dependencies.

affects: >=0.0.1

Errors

Common errors & fixes

TypeError: jsfc is not a function

Using default import with wrong syntax (e.g., { jsfc })

fix

Use import jsfc from 'json-schema-fast-check' not import { jsfc } from 'json-schema-fast-check'

ReferenceError: fc is not defined

Forgot to import fast-check

fix

Add import fc from 'fast-check'

Upgrade

Version history

0.0.6latest on npm

Audit

Dependencies

fast-checkrequiredCore dependency for property-based testing arbitraries

Agent activity

8 hits · last 30 days

node

Resources

packagejson-schema-fast-check ↗