Representative example
This example reflects the implemented transformation or analysis.
Input
{"user":{"id":42,"active":true}}Output
{
"user": {
"id": 42,
"active": true
}
}JSON Formatter
Validate, format, and minify JSON with 2-space, 4-space, or tab indentation, size statistics, copying, and download.
- Free public tool
- No sign-up for this tool
- Processing clearly labeled
- Instant results
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Quick Start
Add input
Paste a valid JSON value and choose an indentation style.
Choose options
2 spaces, 4 spaces, tabs, and Minify input.
Review the result
Check the output or diagnostics, then use the available copy or download control where shown.
Examples
Input and output example 1
Input
{"user":{"id":42,"active":true}}Output
{
"user": {
"id": 42,
"active": true
}
}About the JSON Formatter
JSON Formatter addresses a focused developer workflow without requiring a command-line setup. Validate, format, and minify JSON with 2-space, 4-space, or tab indentation, size statistics, copying, and download. Results update from the supplied input, making it useful for quick inspection, debugging, documentation, or test preparation.
In this tool, JSON Formatter: processing runs in the browser and the tool does not call an external conversion API. Input remains in page memory unless a confirmed browser feature such as file reading or local settings is described above.
How to Use JSON Formatter
Paste a valid JSON value and choose an indentation style.
Configure 2 spaces, 4 spaces, tabs, and minify input.
Review the generated output, status, or validation message.
Copy or download the result when that control is available, and verify it in the destination where it will be used.
Key Features
Focused processing
The input is parsed with
JSON.parseand serialized withJSON.stringify. Parse failures are shown instead of producing output.Input guidance
Strict JSON values including objects, arrays, strings, numbers, booleans, and null.
Immediate feedback
Trailing commas, comments, single-quoted strings, and unquoted keys are not valid JSON.
When to Use JSON Formatter
Application development
Use JSON Formatter to prepare or inspect values while implementing a feature.
Fault isolation
Run a small known input through JSON Formatter to distinguish formatting or syntax problems from surrounding application behavior.
Reviewable examples
Create a concise { for tests, documentation, or code review.
How It Works
Processing flow
The input is parsed with JSON.parse and serialized with JSON.stringify. Parse failures are shown instead of producing output.
Result handling
During processing, JSON Formatter: the result is rendered directly in the tool interface. Validation failures are displayed instead of being silently treated as successful output.
Supported Formats and Options
Formats
Accepted input
Strict JSON values including objects, arrays, strings, numbers, booleans, and null
Displayed output
{
Options
Available controls
2 spaces, 4 spaces, tabs, and Minify input
Common Errors and Troubleshooting
Common errors
Invalid or incomplete input
Trailing commas, comments, single-quoted strings, and unquoted keys are not valid JSON.
Unexpected result
Confirm that the selected mode or syntax matches the source and that the input is complete.
Troubleshooting guide
Resolve the reported error
Trailing commas, comments, single-quoted strings, and unquoted keys are not valid JSON. Reduce the input to the smallest failing case and confirm the selected controls.
Check an unexpected result
Review the documented limitation for JSON Formatter, then compare a known example with the same mode or syntax before processing a larger value.
Limitations and Important Notes
Formatting cannot repair invalid JSON or preserve insignificant whitespace and original key formatting.
Privacy and Data Processing
JSON Formatter performs its implemented transformation in the browser without calling an external processing API. Input is held in the current page state, so still avoid unnecessary secrets and clear the field on a shared device.
Tips and Best Practices
Practical tips
Keep the original strict json values including objects, arrays, strings, numbers, booleans, and null before using JSON Formatter.
Exercise the error case described as: Trailing commas, comments, single-quoted strings, and unquoted keys are not valid JSON.
Check the result against this limitation: Formatting cannot repair invalid JSON or preserve insignificant whitespace and original key formatting.
Best practices
Prepare a representative input
Start with a small value whose expected result you understand, then add the edge cases relevant to JSON Formatter. Preserve the original when the conversion or formatting is destructive.
Verify in context
Formatting cannot repair invalid JSON or preserve insignificant whitespace and original key formatting. Treat the displayed result as an intermediate artifact and test it in the runtime, parser, database, or document where it will actually be used.
Technical Details
Implementation note: JSON Formatter: the input is parsed with JSON.parse and serialized with JSON.stringify. Parse failures are shown instead of producing output.
Who Is This For?
Developers, QA engineers, technical writers, analysts, and students who need validate, format, and minify JSON with 2-space, 4-space, or tab indentation, size statistics, copying, and download.
Frequently Asked Questions
Does JSON Formatter send input to an API?
No external processing API is used by this tool; its implemented operation runs in the browser.
What input is supported?
Strict JSON values including objects, arrays, strings, numbers, booleans, and null.
Why did the tool show an error?
Trailing commas, comments, single-quoted strings, and unquoted keys are not valid JSON.
What should I verify before using the result?
Formatting cannot repair invalid JSON or preserve insignificant whitespace and original key formatting.