JSON vs JSON5: Which Should You Use?

Side-by-side comparison of JSON and JSON5 data formats — features, pros, cons, and conversion options.

Quick Answer

JSON is best for Web APIs, configuration files, and structured data interchange. JSON5 is best for Human-edited configuration files that need JSON compatibility.

Quick Verdict

JSON Best for Web APIs, configuration files, and structured data interchange

✓ Native to JavaScript and web APIs
✓ Supports nested and typed data
✓ Universally supported across all languages
✗ No comments allowed

Convert JSON to JSON5 →

JSON5 Best for Human-edited configuration files that need JSON compatibility

✓ Comments and trailing commas allowed
✓ Unquoted keys for cleaner syntax
✓ Superset of JSON — all JSON is valid JSON5
✗ Not supported by most APIs

Specs Comparison

Side-by-side technical comparison of JSON and JSON5

Feature	JSON	JSON5
Category	Data	Data
Year Introduced	2001	2012
MIME Type	application/json	application/json5
Extensions	.json	.json5
Plain Text	✓	✓
Typed	✓	✓
Nested	✓	✓
Human Readable	✓	✓
Schema Support	✓	✗
Streaming	✗	✗
Binary Efficient	✗	✗

Pros & Cons

JSON

Pros

✓ Native to JavaScript and web APIs
✓ Supports nested and typed data
✓ Universally supported across all languages

Cons

✗ No comments allowed
✗ Verbose for large datasets
✗ No date or binary type

JSON5

Pros

✓ Comments and trailing commas allowed
✓ Unquoted keys for cleaner syntax
✓ Superset of JSON — all JSON is valid JSON5

Cons

✗ Not supported by most APIs
✗ Requires separate parser
✗ Less tooling than standard JSON

When to Use Each

Choose JSON when...

You need files optimized for Web APIs, configuration files, and structured data interchange
Native to JavaScript and web APIs
Supports nested and typed data

Choose JSON5 when...

You need files optimized for Human-edited configuration files that need JSON compatibility
Comments and trailing commas allowed
Unquoted keys for cleaner syntax

How to Convert

Convert between JSON and JSON5 for free on ChangeThisFile

Convert JSON to JSON5 Server-side conversion — auto-deleted after processing

Frequently Asked Questions

What's the difference between JSON and JSON5?

JSON is best for Web APIs, configuration files, and structured data interchange, while JSON5 is best for Human-edited configuration files that need JSON compatibility. Both are data formats but they differ in compression, compatibility, and intended use cases.

Is JSON or JSON5 better for data?

It depends on your use case. JSON is better for Web APIs, configuration files, and structured data interchange. JSON5 is better for Human-edited configuration files that need JSON compatibility. Consider your specific requirements when choosing between them.

How do I convert JSON to JSON5?

Go to the JSON to JSON5 converter on ChangeThisFile. Upload your file and the conversion processes on the server, then auto-deletes. It's free with no signup required.

Can I convert JSON5 to JSON?

Direct conversion from JSON5 to JSON is not currently supported. Check the conversion pages for available routes using intermediate formats.

Which is smaller, JSON or JSON5?

File size varies depending on the content, compression method, and quality settings of each format. In general, lossy formats produce smaller files than lossless ones. Test with your specific files to compare actual sizes.

Does JSON support schema support?

Yes, JSON supports schema support, but JSON5 does not. This may be important depending on your use case.

Is JSON or JSON5 free to use?

Both JSON and JSON5 are supported file formats that are free to use. You can convert between them for free on ChangeThisFile — server-side conversions are free with no signup required.

Which format is newer, JSON or JSON5?

JSON5 is newer — it was introduced in 2012, while JSON dates back to 2001. Newer formats often offer better compression and features, but older formats tend to have wider compatibility.