JSON Formatter / Validator
How to Format JSON Online
Copy your raw, minified, or unformatted JSON data and paste it into the input area above.
Click Prettify to add indentation and line breaks for readability, or Minify to compress JSON into a single line for production use.
The formatted or minified JSON is displayed instantly. Click Copy to copy it to your clipboard.
What Is JSON Formatting?
JSON (JavaScript Object Notation) is the most widely used data interchange format on the web. APIs, configuration files, databases, and web applications all use JSON to store and transmit structured data. However, raw JSON from APIs or minified production files is often compressed into a single line without whitespace, making it nearly impossible to read and debug. A JSON formatter adds proper indentation, line breaks, and spacing to make JSON human-readable.
Who Needs a JSON Formatter?
API developers use JSON formatters daily to inspect responses from REST and GraphQL endpoints. Front-end developers format JSON configuration files for webpack, package.json, tsconfig.json, and other tooling. Database administrators format MongoDB documents and Elasticsearch queries for debugging. QA engineers validate JSON payloads during API testing. DevOps engineers format and validate Terraform state files and Kubernetes manifests.
Frequently Asked Questions
Does this tool validate JSON?
Yes. If your JSON is invalid (missing brackets, trailing commas, unquoted keys), the tool will show a syntax error message identifying the problem.
What is the difference between prettify and minify?
Prettify adds indentation and line breaks to make JSON readable. Minify removes all whitespace to produce the smallest possible file — useful for production APIs and configuration.
Can it handle large JSON files?
The tool runs in your browser, so it can handle JSON data up to several megabytes. For extremely large files (50MB+), a desktop tool may be more appropriate.
Is my JSON data stored anywhere?
No. All processing happens in your browser. Your JSON data never leaves your device.