100 KB JSON sample file
A JSON file of exactly 102,400 bytes. It is a valid JavaScript Object Notation file, generated for this site and checked with an independent parser.
Download
sample-json-100kb.json
100 KB102,400 bytes
Download 100 KB JSONDirect download. No sign-up and no waiting.
- Type
- application/json
- SHA-256
c5a34c62c3c70d99a30947c3b5b2dd67b748e3e371b1b25d4e130a2eed09fc1d- Direct URL
https://sampletestfiles.com/downloads/json/sample-json-100kb.json
What is in this file
An object with a "records" array of 297 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 | 297 |
|---|---|
| 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-100kb.json, exactly as they appear in the file.
{
"generator": "SampleTestFiles",
"description": "Sample JSON file (100 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 first 64 KB of the file.
Where 100 KB matters
A 102,400-byte file that sits exactly on the default request-body limit of Express. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| Express body parsers | 100 KB (102,400 bytes) by default | A request body of exactly this size passes; anything larger returns 413 Payload Too Large. |
| Gmail message clipping | About 102 KB of HTML | Longer messages are truncated behind a "view entire message" link. |
| Amazon DynamoDB items | 400 KB per item | 100 KB fits; the 500 KB sample does not. |
Use this file for
- Checking email size handling
- Testing parsers, schema validators and serialisers
- Load-testing endpoints with large payloads
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-100kb.json |
|---|---|
| Format | JSON (JavaScript Object Notation) |
| Extension | .json |
| MIME type | application/json |
| Size | 102,400 bytes (100 KB) |
| Kind | Text |
| SHA-256 | c5a34c62c3c70d99a30947c3b5b2dd67b748e3e371b1b25d4e130a2eed09fc1d |
| 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-100kb.json 'https://sampletestfiles.com/downloads/json/sample-json-100kb.json'
sha256sum sample-json-100kb.json # Linux
shasum -a 256 sample-json-100kb.json # macOSOn Windows, run Get-FileHash sample-json-100kb.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 100 KB?
- Yes. It is 102,400 bytes, which is 100 KB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 100 KB JSON file?
- An object with a "records" array of 297 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.