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API Error — 404 (RFC 9457 problem+json)

A 404 error body in RFC 9457 (problem+json) form, with type, title, status, detail, and instance — for testing structured error handling and problem-detail parsers.

Preview — first 8 linesjson
{
  "type": "https://example.com/errors/not-found",
  "title": "Not Found",
  "status": 404,
  "detail": "No user exists with id 999.",
  "instance": "/v1/users/999"
}

Specifications

Format
application/problem+json
Status
404
Spec
RFC 9457

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.

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