Download Sample JSON Data Files (API Testing)

Download free sample JSON files. JSON (JavaScript Object Notation) is the lightweight data-interchange standard for modern REST and GraphQL APIs. Use these files to test parsing logic, data binding, and error handling. STANDARD Common API Responses File Name Structure / Description Size Action simple_user.json Flat Object Basic key-value pairs (String, Number, Boolean). No nesting. Easy…

Download free sample JSON files. JSON (JavaScript Object Notation) is the lightweight data-interchange standard for modern REST and GraphQL APIs. Use these files to test parsing logic, data binding, and error handling.

STANDARD
Common API Responses

File Name Structure / Description Size Action
simple_user.json
Flat Object		 Basic key-value pairs (String, Number, Boolean). No nesting. Easy to parse. 1 KB Download
product_list.json
Array of Objects		 Typical e-commerce API response. Contains a list of 10 products with IDs and prices. 5 KB Download
large_dataset_10k.json
Performance Test		 Contains 10,000 records. Use to test pagination logic and rendering performance. 2 MB Download

QA / CRASH TEST
Nested, Malformed & Special Chars

Test Case Description Size Action
deeply_nested.json Complex Structure. Objects inside arrays inside objects (5 levels deep). Tests your path-finding/mapping logic. 10 KB Download
broken_syntax.json Syntax Error. Contains a trailing comma and a missing closing brace `}`. Your app should catch this error, not crash. 1 KB Download
unicode_chars.json Contains Emojis, Chinese characters, and escaped quotes. Tests UTF-8 encoding/decoding. 2 KB Download

Technical Specs: JSON

  • Strict Syntax: Unlike JavaScript objects, JSON requires double quotes around keys (e.g., "name": "John") and does NOT allow trailing commas.
  • Data Types: Supports String, Number, Boolean (true/false), Null, Array [], and Object {}. It does not natively support Dates or Functions.
  • MIME Type: application/json.

Frequently Asked Questions

Can I put comments in a JSON file?
No. The official JSON standard does not support comments (`//` or `/* */`). If you add them, standard parsers will throw an error. For configuration files that need comments, consider using JSON5 or YAML.
How do I handle Dates in JSON?
Since JSON has no “Date” type, the standard convention is to store dates as strings in ISO 8601 format (e.g., `”2023-12-31T23:59:59Z”`). Your application must parse this string back into a Date object.

How to view and validate JSON?

A single missing comma breaks the whole file. Use these tools to find errors instantly.

  • JSONLint: The #1 online validator. Paste your code, click “Validate”, and it tells you exactly which line is broken.
  • VS Code (Prettify): Right-click and “Format Document” (Shift+Alt+F). If it fails to format, you have a syntax error.
  • jq (Command Line): The ultimate tool for filtering and transforming JSON directly in the terminal (Mac/Linux).

Developer’s Corner: Error Handling

Always wrap JSON parsing in a try/except block. A malformed file should not crash your backend server.

# Python: Parse JSON safely
import jsontry:
with open(‘data.json’) as f:
data = json.load(f)
print(data[‘user’][‘id’])
except json.JSONDecodeError as e:
print(f“Invalid JSON file: {e}”)

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