Paste JSON
Paste your JSON into the input box (or load the sample).
DEVELOPER TOOLS · FREE ONLINE TOOL
JSON Formatter & Validator
Format, minify and validate JSON with clear errorsJSON is the backbone of modern APIs, and a single missing comma or quote can break an entire integration. This tool beautifies JSON for readability, minifies it for production, and validates it with precise line-and-column error messages.
// JSON FORMATTER & VALIDATOR · GET STARTED
Use JSON Formatter & Validator
Format, minify and validate JSON with clear errors
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How to use the JSON Formatter & Validator
Format or validate
Click "Format" to beautify, "Minify" to compress, or "Validate" to check correctness.
Fix errors
Read any error messages with line/column positions and fix the issues.
Copy result
Copy the result with one click.
// JSON FORMATTER & VALIDATOR · ABOUT THIS TOOL
About the JSON Formatter & Validator
JSON is the backbone of modern APIs, configuration files and data exchange, and a single missing comma can break an entire integration. This tool beautifies JSON for readability, minifies it for production, and validates it with precise error messages including line and column numbers. All processing happens locally on your machine, so API responses containing tokens or personal data stay completely private.
Where it helps most
The loop takes seconds.
Broken API responses
An API returns an error and the raw body needs reading; formatting reveals the true nesting instantly.
Stubborn config files
A config file refuses to load and the culprit is one misplaced bracket; the validator points at the exact position.
Slimming payloads
A payload needs slimming before it goes into a mobile app; minify strips it to the smallest valid form.
Unfamiliar payloads
Structural stats like object depth and key counts answer how big and how nested an inherited API is at a glance.
Using it well
Three actions, full lifecycle.
Format for reading
Adds indentation and line breaks that reveal the true nesting of an API response at a glance.
Minify for shipping
Strips formatting back out for the smallest possible payload when JSON ships to production systems.
Validate correctness
Checks correctness and points at the exact spot where parsing broke: usually a trailing comma or unquoted name.
JSON Formatter & Validator: private by design
Everything runs locally in your browser, so responses with tokens, keys or personal data never leave your device.
JSON Formatter & Validator FAQs
Formatting, or beautifying, adds indentation and line breaks so humans can read the structure, while minifying removes all unnecessary whitespace so the file is as small as possible for APIs and production use. Both are one click in this tool, and you can move between them freely.
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