1 MB JSON sample file
A JSON file of exactly 1,048,576 bytes. It is a valid JavaScript Object Notation file, generated for this site and checked with an independent parser.
Download
sample-json-1mb.json
1 MB1,048,576 bytes
Download 1 MB JSONDirect download. No sign-up and no waiting.
- Type
- application/json
- SHA-256
b2f9926708ffba504b4c177aadb078a7999093eeb0e22b31f8ea03bcd2adc0b2- Direct URL
https://sampletestfiles.com/downloads/json/sample-json-1mb.json
What is in this file
An object with a "records" array of 3,029 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 | 3,029 |
|---|---|
| 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-1mb.json, exactly as they appear in the file.
{
"generator": "SampleTestFiles",
"description": "Sample JSON file (1 MB) 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 1 MB matters
A 1,048,576-byte file: exactly the default upload limit of nginx, Spring Boot and Next.js. These are the default limits a file of this size is useful for testing:
| System | Limit | Note |
|---|---|---|
| nginx | 1 MB by default (client_max_body_size) | A multipart upload of this file exceeds the limit by the size of the form boundaries. |
| Spring Boot multipart | 1 MB per file by default (max-file-size) | A file of exactly 1 MB is at the limit. |
| Next.js API routes and Server Actions | 1 MB by default | Larger bodies need the size limit raised in configuration. |
| Cloud Firestore documents | 1 MiB (1,048,576 bytes) | The same number of bytes as this file. |
| Apache Kafka messages | About 1 MB by default | Brokers reject larger records unless message.max.bytes is raised. |
Use this file for
- Download tests on mobile connections
- Seeding front-end components with data
- Mocking API responses
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.
Technical details
| File name | sample-json-1mb.json |
|---|---|
| Format | JSON (JavaScript Object Notation) |
| Extension | .json |
| MIME type | application/json |
| Size | 1,048,576 bytes (1 MB) |
| Kind | Text |
| SHA-256 | b2f9926708ffba504b4c177aadb078a7999093eeb0e22b31f8ea03bcd2adc0b2 |
| 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-1mb.json 'https://sampletestfiles.com/downloads/json/sample-json-1mb.json'
sha256sum sample-json-1mb.json # Linux
shasum -a 256 sample-json-1mb.json # macOSOn Windows, run Get-FileHash sample-json-1mb.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 MB?
- Yes. It is 1,048,576 bytes, which is 1 MB in the binary units that operating systems and server limits use (1 KB = 1,024 bytes).
- What is inside the 1 MB JSON file?
- An object with a "records" array of 3,029 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.