JSON Formatter & Validator

How to use the JSON Formatter & Validator

1. Paste your JSON into the left panel, open a .json file, or drop one onto it.
2. The formatted result appears on the right instantly. If there is a mistake, you will see the line and column.
3. Pick 2 spaces, 4 spaces or tabs, and optionally sort keys alphabetically.
4. Copy the result or save it as a .json file.

Examples

{"id":42,"user":{"name":"Ada Lovelace","roles":["admin","editor"]},"active":true,"score":9.5,"tags":[]}

{
  // server config
  "port": 8080,
  "hosts": ["a.local", "b.local",],
}

{
  "name": "Widget",
  "price": 9.99
  "stock": 12
}

About this tool

JSON (JavaScript Object Notation) is the most common format for APIs, configuration files and data exchange. Machines are happy with it squeezed onto one line, but people are not. This formatter re-indents JSON so every object and array sits on its own level, which makes it far easier to read, review and debug.

It also acts as a validator. If the JSON is invalid, you get a plain-English message with the line and column of the problem, plus the surrounding text, so you can fix a missing comma or quote in seconds. The forgiving mode quietly repairs the two most common copy-paste problems: trailing commas and // comments.

Sorting keys alphabetically is handy when comparing two JSON documents or keeping configuration files tidy in version control.