25 KB JSON sample file

A JSON file of exactly 25,600 bytes. It is a valid JavaScript Object Notation file, generated for this site and checked with an independent parser.

sample-json-25kb.json

25 KB25,600 bytes

Download 25 KB JSON

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Type: application/json
SHA-256: 2e9601f6c71299488fb7936a3e105673e436ebc39d3fb20341a5fa8ecc6d946b
Direct URL: https://sampletestfiles.com/downloads/json/sample-json-25kb.json

What is in this file

An object with a "records" array of 74 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	74
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-25kb.json, exactly as they appear in the file.

{
  "generator": "SampleTestFiles",
  "description": "Sample JSON file (25 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 25 KB matters

A 25,600-byte file: the size of a small web image or a short document. These are the default limits a file of this size is useful for testing:

System	Limit	Note
TCP initial congestion window	About 14.6 KB (10 segments)	25 KB needs at least two flights of packets on a new connection.
Base64 encoding	Adds 33 percent	A 25 KB file becomes about 34 KB inside JSON or an email.

All 25 KB sample files

Use this file for

Testing avatar and logo uploads
Seeding front-end components with data
Mocking API responses

Testing notes for JSON

Most parsers read numbers as 64-bit floats, so integers above 2^53 silently lose precision. Send large identifiers as strings.
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.

JSON format reference

Technical details

File name	sample-json-25kb.json
Format	JSON (JavaScript Object Notation)
Extension	.json
MIME type	application/json
Size	25,600 bytes (25 KB)
Kind	Text
SHA-256	2e9601f6c71299488fb7936a3e105673e436ebc39d3fb20341a5fa8ecc6d946b
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-25kb.json 'https://sampletestfiles.com/downloads/json/sample-json-25kb.json'
sha256sum sample-json-25kb.json     # Linux
shasum -a 256 sample-json-25kb.json # macOS

On Windows, run Get-FileHash sample-json-25kb.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 25 KB?: Yes. It is 25,600 bytes, which is 25 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
What is inside the 25 KB JSON file?: An object with a "records" array of 74 fictional customer objects, each with nested objects, an array and a nullable field. A final "padding" string brings the file to the exact size.
Why is there a "padding" field?: JSON has no comments, so a final string member is used to bring each sized file to its exact byte count.

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