JSON Formatter & Validator
Paste JSON to format, validate and explore it instantly. Errors are shown with the exact line and column — everything runs in your browser.
Your JSON is formatted and validated in your browser — it is never uploaded.
How to use the JSON Formatter & Validator
Paste or upload JSON
Paste text, drop a .json file or load a sample.
Format or minify
Pick 2 or 4 spaces or tabs, sort keys if you like.
Copy or download
Copy the result or save it as a .json file.
Why use our JSON Formatter & Validator?
Strict validation
Shows the exact line, column and a code preview of any error.
Beautify
2 spaces, 4 spaces or tab indentation.
Minify
Remove all whitespace to make JSON as small as possible.
Tree view
Collapse and expand objects and arrays.
Sort keys
Alphabetically sort object keys at every level.
100% private
Your JSON never leaves your browser.
Frequently asked questions
Everything you need to know about the JSON Formatter & Validator.
Back to the toolWhat is a JSON formatter?
A JSON formatter adds line breaks and indentation to JSON so it is easy to read. It also checks that the JSON is valid.
Why is my JSON invalid?
The most common reasons are trailing commas, single quotes instead of double quotes, unquoted keys and comments. The validator shows the exact line and column of the problem.
Is my data safe?
Yes. Formatting and validation happen entirely in your browser. Nothing is uploaded to our server.
What is the difference between beautify and minify?
Beautify adds indentation for readability. Minify removes all unnecessary spaces and line breaks to make the file smaller for APIs and production.
Can I open a large JSON file?
Yes. Files of several megabytes work fine. For very large files the tree view shows the first items of long arrays for speed.
You may also like
Have a project in mind? Let’s build it together.
Get a free consultation and a fixed-price quote within 24 hours.