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npm Lockfile With Integrity Mismatch: Intentionally Invalid

An intentionally invalid npm lockfile: two fictional packages carry sha512 integrity strings that cannot match their resolved tarballs, one derived from the wrong version, one a padded placeholder. Every package, version, hash and licence is fictional: the tree describes nothing real.

Error handlingJSON parsingSchema validation
Preview, first 50 linesjson
{
  "name": "orchard-gateway",
  "version": "4.2.0",
  "lockfileVersion": 3,
  "requires": true,
  "packages": {
    "": {
      "name": "orchard-gateway",
      "version": "4.2.0",
      "license": "Apache-2.0",
      "dependencies": {
        "@orchard-example/router": "^2.1.0",
        "@orchard-example/http-core": "^1.8.0",
        "example-metrics": "^4.0.0",
        "example-cache": "^0.9.0",
        "example-crypto-shim": "^1.2.0"
      },
      "engines": {
        "node": ">=20.9"
      }
    },
    "node_modules/@orchard-example/router": {
      "version": "2.1.3",
      "resolved": "https://registry.orchard.example/@orchard-example/router/-/router-2.1.3.tgz",
      "integrity": "sha512-qtnM4l9j8zUuqQ9ICsxCdfl879PtducHYPiqO151qEu6bBv48+zuYbTbn/vSTJGbCd2RvGpDry/NEkSe1babaA==",
      "license": "Apache-2.0",
      "dependencies": {
        "example-logger": "^3.4.0",
        "example-retry": "^1.0.0"
      }
    },
    "node_modules/@orchard-example/http-core": {
      "version": "1.8.0",
      "resolved": "https://registry.orchard.example/@orchard-example/http-core/-/http-core-1.8.0.tgz",
      "integrity": "sha512-fG9AJmG+37+sln/eMVPmbu/bIcV+QbJ3bibSV9ob8PV6GYNFinrhSJQYFxkEYEHxckXBn7ExDim59rqSDaYoFg==",
      "license": "MIT",
      "dependencies": {
        "example-logger": "^3.4.0",
        "example-json-path": "^2.0.0"
      }
    },
    "node_modules/example-metrics": {
      "version": "4.0.0",
      "resolved": "https://registry.orchard.example/example-metrics/-/example-metrics-4.0.0.tgz",
      "integrity": "sha512-Sq3cxZ+Brv4bgLd+5B/o3upQ1O6YKjbr6TP5ZBZfw4XVjna6/8YkOeB52iLhrRDjs1UiF5v20Ijr7bEJtHKcOQ==",
      "license": "MIT",
      "dependencies": {
        "example-logger": "^3.4.0"
      }
    },
… 95 lines total: download for the full file.

Specifications

Seed
51200
Sample Only
true
Ecosystem
npm
Lockfile Version
3
Bad Integrity Entries
2
Intentionally Invalid
true
Line Endings
LF

Testing contract

Expected to fail
Scenario
Verify lockfile integrity hashes before installing.
Expected result
Checker flags exactly two entries (example-logger, example-cache) as integrity failures and leaves the other seven untouched.

What is a .json file?

JSON (JavaScript Object Notation) is a lightweight, text-based data-interchange format representing objects, arrays, strings, numbers, booleans, and null. It is language-independent, human-readable, and the dominant format for web APIs and configuration. It requires a single well-formed root value.

How to use this file

Use an example JSON file to test parsers and serializers, schema validation, Unicode and number-precision handling, and API request or response processing.

How to use this file for testing

“npm Lockfile With Integrity Mismatch: Intentionally Invalid” is a deterministic Testaroo fixture for Error handling, JSON parsing, Schema validation. Deliberately corrupt and invalid files, clearly labelled, for testing how your tool fails.

Documented properties for this file: seed 51200 · LF. Compare results against paired or grouped companions on this page when present (clean↔damaged, searchable↔scanned, or format twins) so scores stay reproducible across runs.

Download the file once, keep the path stable in CI or local scripts, and treat the spec table as the contract: dimensions, seeds, field lists, and roles are intentional. Corrupt or invalid samples are labelled as such, expect parsers to fail loudly rather than silently accept them.

SBOM, lockfile, provenance, and advisory fixtures describe the same fabricated component tree across formats, so a converter or scanner can be diffed against a known answer. Every package name, version, hash, and advisory ID is invented, never treat a finding here as real.

Code examples

import json

with open("package-lock-integrity-mismatch.json") as f:
    data = json.load(f)
print(type(data), len(data))

Generated by generation/supply_chain.py. Free for any use, no attribution required, license.

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