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JSON Formatter

Format, validate and minify JSON instantly.

Free browser toolRuns in your browserNo sign-up
Data debugging studio

Format, validate and inspect JSON with confidence

Load an API payload or configuration snippet, catch parser errors, beautify it for review or minify it for transport—all without sending the data away.

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JSON status

Waiting

root type

0 B

input size

JSON input

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Paste text or load a local .json file

Processed output

No output yet
Output is generated explicitly; input is never modified automatically.
Private by design. Input is processed inside this browser tab and is not sent to ToolsOnDuty.

About the JSON Formatter

Format, validate and minify JSON to make it readable or compact, great for debugging API responses, config files and logs.

Invalid JSON is caught immediately with the exact parser error, so you can pinpoint and fix problems fast.

Formatting makes large payloads easier to scan and diff, while minifying removes whitespace to reduce size for storage or transfer.

Key features

  • Beautify JSON with clean indentation
  • Minify JSON down to a single line
  • Instant validation with explicit parser errors
  • Root type, entry count and byte-size inspection
  • Local JSON file loading and processed-file download
  • Processed locally - safe for sensitive data

How to use

  1. 1Paste JSON, load a local .json file or start with the API sample.
  2. 2Review the live validity, root-type and input-size indicators.
  3. 3Choose Format JSON for readable indentation or Minify for a compact payload.
  4. 4Fix any parser error shown below the workspace.
  5. 5Copy the result or explicitly download the processed .json file.
  6. 6Copy or download the formatted JSON after resolving any reported syntax error.

Examples

Beautify
Input: {"a":1,"b":[2,3]}
Output: { "a": 1, "b": [2, 3] }

Indentation and line breaks are added so the JSON is easy to read.

Minify
Input: { "a": 1 }
Output: {"a":1}

All whitespace is stripped to make the JSON as small as possible.

Frequently asked questions

Does it validate JSON too?
Yes. If the JSON is invalid, the exact parser error is shown so you can fix it quickly.
What is the difference between Format and Minify?
Formatting adds indentation and line breaks for readability; minifying removes all unnecessary whitespace to make the JSON as small as possible.
Is my JSON sent to a server?
No. All formatting, validation and minifying happen locally in your browser, so it is safe for sensitive data.

Helpful guides

Developer GuidesHow to Format JSON and Find ErrorsRead guide

Continue your workflow

Open a related tool to prepare your files or refine the finished result.