What is JSON Formatter & Validator?
Readable JSON is easier to inspect, review and debug. This formatter parses your input in the browser so it can validate syntax and return a consistently indented representation without sending the content to a SmartToolkit application server.
SmartToolkit is built around transparent inputs and readable results. Where the task can run entirely in the browser, the page is designed to do so without intentionally uploading the working data to a SmartToolkit application server.
Common uses
- Formatting API responses for review
- Checking configuration snippets
- Minifying JSON before storage or transport
- Finding syntax errors before using a payload
How to use this tool
- Paste JSON into the editor.
- Choose Format for readable indentation or Minify for compact output.
- If the JSON is invalid, review the error message.
- Copy the result when it is ready.
Frequently asked questions
Does this support comments in JSON?
No. Standard JSON does not allow comments, so commented input will fail validation.
Is my JSON uploaded?
No. Parsing and formatting happen locally in your browser.
What indentation is used?
Formatted output uses two spaces per nesting level.
Before you use the result
General-purpose tools are useful for drafting, checking and routine calculations, but the destination system may have its own rules. Review important results before using them in financial, academic, professional or production workflows.