JSON Formatter & Validator
Validate, pretty-print, or minify JSON without sending data to the server.
Why validate JSON?
Validation catches syntax errors before data is sent to an API or imported into an application. Pretty-printing also makes nested structures easier to read.
Use the result with confidence
Recommended workflow
- Paste a representative JSON sample and validate it first.
- Format or minify only after the syntax is valid.
- Compare the result with the source before copying it into an application.
What to verify
- Confirm the scope, units and input values before interpreting the output.
- Separate the observed result from the operational decision that follows from it.
- Validate the conclusion against the real target system, logs or configuration before changing production.
Questions about this tool
What is the difference between validating and formatting JSON?
Validation checks whether the JSON structure is syntactically valid; formatting only changes indentation and presentation without intentionally changing the data model.
Does minifying JSON change its data?
Minification removes unnecessary whitespace and line breaks. The logical structure should remain the same, so validate again if the document will be used by an application.
Does the JSON content leave the browser?
This formatter is designed for browser-side processing. Even so, use anonymised samples whenever the document may contain credentials or personal data.