1 KB JSON sample file
A JSON file of exactly 1,024 bytes. It is a valid JavaScript Object Notation file, generated for this site and checked with an independent parser.
Download
- Type
- application/json
- SHA-256
ad621d2aa2d1c1fb370792bea5375896a19750971bc6cbe565e6d591568b2c86- Direct URL
https://sampletestfiles.com/downloads/json/sample-json-1kb.json
What is in this file
An object with a "records" array of 2 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 | 2 |
|---|---|
| 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-1kb.json, exactly as they appear in the file.
{
"generator": "SampleTestFiles",
"description": "Sample JSON file (1 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 1 KB matters
The smallest practical test file: 1,024 bytes, small enough to travel in a single network packet. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Ethernet | 1,500 bytes (typical MTU) | A 1 KB payload fits in one packet with its headers. |
| Browser cookies | 4,096 bytes per cookie | 1 KB is well inside the limit; the 5 KB sample is over it. |
Use this file for
- Smoke tests in CI that must run in milliseconds
- Mocking API responses
- Testing parsers, schema validators and serialisers
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.
Technical details
| File name | sample-json-1kb.json |
|---|---|
| Format | JSON (JavaScript Object Notation) |
| Extension | .json |
| MIME type | application/json |
| Size | 1,024 bytes (1 KB) |
| Kind | Text |
| SHA-256 | ad621d2aa2d1c1fb370792bea5375896a19750971bc6cbe565e6d591568b2c86 |
| 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-1kb.json 'https://sampletestfiles.com/downloads/json/sample-json-1kb.json'
sha256sum sample-json-1kb.json # Linux
shasum -a 256 sample-json-1kb.json # macOSOn Windows, run Get-FileHash sample-json-1kb.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 1 KB?
- Yes. It is 1,024 bytes, which is 1 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 KB JSON file?
- An object with a "records" array of 2 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.