50 KB JSON sample file

A JSON file of exactly 51,200 bytes. It is a valid JavaScript Object Notation file, generated for this site and checked with an independent parser.

sample-json-50kb.json

50 KB51,200 bytes

Download 50 KB JSON

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Type: application/json
SHA-256: 1d507fdbd5b6d8c09552cb2f01b2381de912ec39be75a0aea538175da8ab03a0
Direct URL: https://sampletestfiles.com/downloads/json/sample-json-50kb.json

What is in this file

An object with a "records" array of 148 fictional customer objects, each with nested objects, an array and a nullable field. A final "padding" string brings the file to the exact size.

Records	148
Root type	Object
Value types used	string, number, boolean, null, array, object
Encoding	UTF-8 (ASCII characters only)
Indentation	2 spaces, one record per line

How the file begins

The opening lines of sample-json-50kb.json, exactly as they appear in the file.

{
  "generator": "SampleTestFiles",
  "description": "Sample JSON file (50 KB) for testing",
  "records": [
    {"id":1,"uuid":"a6cf3b6b-cd57-4173-a942-a2339c75f449","name":{"first":"Ethan","last":"Zeller"},"email":"ethan.zeller1@example.com","active":true,"…
    {"id":2,"uuid":"e86fd25c-cc5a-44ae-a8ee-4439d8d6c68e","name":{"first":"Elena","last":"Underhill"},"email":"elena.underhill2@example.net","active":…

Preview

Shows the file contents.

Where 50 KB matters

A 51,200-byte file, half of the default body limit in several web frameworks. These are the default limits a file of this size is useful for testing:

System	Limit	Note
Express body parsers	100 KB by default	50 KB is accepted; 500 KB is rejected with 413 unless the limit is raised.
Base64 encoding	Adds 33 percent	50 KB becomes about 67 KB when embedded in JSON.

All 50 KB sample files

Use this file for

Testing document previews
Mocking API responses
Testing parsers, schema validators and serialisers

Testing notes for JSON

Parsing a large document with a DOM-style parser needs several times its size in memory. Use a streaming parser or JSON Lines for big data.
The JSON standard does not say what happens with duplicate keys, so different parsers keep different values.

JSON format reference

Technical details

File name	sample-json-50kb.json
Format	JSON (JavaScript Object Notation)
Extension	.json
MIME type	application/json
Size	51,200 bytes (50 KB)
Kind	Text
SHA-256	1d507fdbd5b6d8c09552cb2f01b2381de912ec39be75a0aea538175da8ab03a0
Created	2026-10-10
Validation	Exact size, signature bytes and structure checked when the file was generated
Preview	Available on this page
Source	Generated for this site; not copied from elsewhere
Licence	Free to use, modify and redistribute (terms)
Category	Data

Validated for expected format and integrity. As with any download, scan the file with your own security tools before opening it. How files are made and checked

Download from the command line and verify

Fetch the file with curl, then compare its checksum with the SHA-256 value above.

curl -o sample-json-50kb.json 'https://sampletestfiles.com/downloads/json/sample-json-50kb.json'
sha256sum sample-json-50kb.json     # Linux
shasum -a 256 sample-json-50kb.json # macOS

On Windows, run Get-FileHash sample-json-50kb.json -Algorithm SHA256 in PowerShell. A matching value proves that the download is complete and unaltered.

Related files

Questions about this file

Is this file exactly 50 KB?: Yes. It is 51,200 bytes, which is 50 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 50 KB JSON file?: An object with a "records" array of 148 fictional customer objects, each with nested objects, an array and a nullable field. A final "padding" string brings the file to the exact size.
What is the structure of the sample JSON?: An object with a "records" array. Each record has strings, numbers, a boolean, a nullable field, a nested object and an array, so most deserialiser paths are exercised.

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