JSON Formatter & Validator
Paste JSON below, then format, minify or validate it. Errors are explained clearly so you can fix them fast.
About this JSON formatter
JSON (JavaScript Object Notation) is the most common format for sending data between apps and APIs. When JSON arrives as one long line it's hard to read; when you're typing it by hand it's easy to make a small mistake that breaks everything. This tool beautifies JSON into a clean, indented layout, validates it, and can minify it back down — instantly and privately in your browser.
How to use it
- Paste your JSON into the box.
- Click Format to pretty-print it, or Minify to compress it.
- Click Validate to check whether it's valid JSON.
- If there's an error, read the message — it tells you what went wrong.
- Use Copy to grab the result.
Frequently asked questions
What does "format" do?
It pretty-prints your JSON with neat indentation so it is easy to read, and confirms the JSON is valid.
What does "minify" do?
It removes all unnecessary spaces and line breaks to make the JSON as small as possible — useful for sending data over a network.
How do I fix an "invalid JSON" error?
The tool shows where parsing failed. Common causes are trailing commas, missing quotes around keys, or single quotes instead of double quotes.
Is my data safe?
Yes. The formatter runs entirely in your browser — your JSON is never uploaded to any server.
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