10 KB JSON sample file
A JSON file of exactly 10,240 bytes. It is a valid JavaScript Object Notation file, generated for this site and checked with an independent parser.
Download
sample-json-10kb.json
10 KB10,240 bytes
Download 10 KB JSONDirect download. No sign-up and no waiting.
- Type
- application/json
- SHA-256
3be83bf0e6ffafba9602113a16fde6a6cd426b1161e77cc0f6c20162b8abd7f5- Direct URL
https://sampletestfiles.com/downloads/json/sample-json-10kb.json
What is in this file
An object with a "records" array of 29 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 | 29 |
|---|---|
| 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-10kb.json, exactly as they appear in the file.
{
"generator": "SampleTestFiles",
"description": "Sample JSON file (10 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 10 KB matters
A 10,240-byte file that still arrives in the first round trip of a new connection. 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) | A 10 KB response fits in the first flight of packets; the 25 KB sample does not. |
| nginx and Apache request headers | 8 KB per header line by default | Data this large must go in the request body. |
| webpack asset modules | 8 KB by default | Assets over the threshold are emitted as files instead of data URIs. |
Use this file for
- Checking thumbnail and icon handling
- Load-testing endpoints with large payloads
- Seeding front-end components with data
Testing notes for JSON
- The JSON standard does not say what happens with duplicate keys, so different parsers keep different values.
- Most parsers read numbers as 64-bit floats, so integers above 2^53 silently lose precision. Send large identifiers as strings.
Technical details
| File name | sample-json-10kb.json |
|---|---|
| Format | JSON (JavaScript Object Notation) |
| Extension | .json |
| MIME type | application/json |
| Size | 10,240 bytes (10 KB) |
| Kind | Text |
| SHA-256 | 3be83bf0e6ffafba9602113a16fde6a6cd426b1161e77cc0f6c20162b8abd7f5 |
| 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-10kb.json 'https://sampletestfiles.com/downloads/json/sample-json-10kb.json'
sha256sum sample-json-10kb.json # Linux
shasum -a 256 sample-json-10kb.json # macOSOn Windows, run Get-FileHash sample-json-10kb.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 10 KB?
- Yes. It is 10,240 bytes, which is 10 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 10 KB JSON file?
- An object with a "records" array of 29 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.