JSON Formatter

Developer Tools

Format, validate & minify JSON

FreePrivateInstant
Add a file · .txt .md .csv .json … · up to 2.00 MB
Full guide, 3 min readWhy your JSON will not parse, and how to find the bad commaRead the story behind this tool →
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  2. Press Copy code.
  3. Paste it into your page, blog, WordPress or Notion HTML block.
Height
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The tool runs inside your visitor's browser, nothing is uploaded, and a small "Powered by ToolCloak" line stays under it. The second line (script) is optional: it makes the frame fit the tool's height.

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History

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JSON Formatter — at a glance

Turn messy one-line JSON into neat, indented, easy-to-read JSON — and check it for errors.

Messy JSON
{"name":"Raj","age":25,
"city":"Delhi"}
Format
Pretty JSON
{
"name": "Raj",
"age": 25,
"city": "Delhi"
}

How to use it — step by step

You can also minify JSON to make it as small as possible.

1

Paste JSON

Paste your JSON (from an API, file or code) into the input box.

2

Choose mode

Pick Format to beautify or Minify to compress. Set indent to 2 or 4 spaces.

3

Press the button

If there is a mistake, you will see an error telling you where.

4

Copy output

Copy the clean JSON with one click.

Pro tips

Small things that make the result better.

✦All keys and strings need "double quotes" — single quotes are invalid in JSON.
✦No trailing comma after the last item.
✦Use Minify before sending JSON in production to save bandwidth.

Quick facts

2 / 4space indent options
Validatesshows syntax errors
Minifysmallest possible size
PrivateJSON stays in your browser

Frequently Asked Questions

Why does my JSON show a syntax error?+

Common causes: a trailing comma, single quotes instead of double quotes, a missing comma between items, or an unclosed bracket.

Format vs Minify — what is the difference?+

Format adds spaces and line breaks so humans can read it. Minify removes them to make the file smaller.

Can JSON have comments?+

No. Standard JSON does not allow comments.

Is my data safe?+

Yes. Everything runs inside your own browser. Your text, files and images are never uploaded to any server.

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