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Source map with deliberately invalid fields and mappings

A deliberately invalid source map: version 2 instead of 3, a sources array longer than sourcesContent, a mapping segment that names an index outside `names`, and a `$` that is not in the base64 VLQ alphabet. For testing that a decoder validates the envelope before trusting the mappings.

Web assetsJSON parsingError handling
Preview — first 18 linesjson
{
  "version": 2,
  "file": "bundle.min.js",
  "sourceRoot": "",
  "sources": [
    "src/greet.js",
    "src/index.js",
    "src/missing.js"
  ],
  "sourcesContent": [
    "export function greet(name) {\n  return `Hello, ${name}!`;\n}\n"
  ],
  "names": [
    "greet"
  ],
  "mappings": "MAAOA,WAAeC,GACpB,qBCAF,YAAYD;AA$A,;;"
}

Specifications

Seed
70400
Site
example.com (fictional)
Version
2
Sources
3
Sources Content
1
Names
1
Illegal Mapping Chars
$
Deliberately Invalid
true

Testing contract

Expected to fail
Scenario
Load a source map whose version, array lengths and VLQ alphabet are all wrong.
Expected result
The decoder rejects version 2, reports the sources/sourcesContent length mismatch and the out-of-range name index, and raises on the illegal `$` character instead of decoding it as zero.

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

“Source map with deliberately invalid fields and mappings” is a deterministic Novus Examples fixture for Web assets, JSON parsing, Error handling. Favicons, web app manifests, service workers, robots and sitemap files, Open Graph images, and .well-known resources — for testing web tooling, crawlers, PWA installers, and asset pipelines.

Documented properties for this file: seed 70400. 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.

Web-platform fixtures are standards-compliant samples against fictional example.com data. Test crawlers, PWA installers and manifest validators, favicon/icon pipelines, service-worker registration, or .well-known parsers against the documented structure.

Code examples

import json

with open("sourcemap-invalid.json") as f:
    data = json.load(f)
print(type(data), len(data))

Related files

Generated by generation/web_p7.py. Free for any use, no attribution required — license.