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Smart Toolsby FlowPilot AI

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JSON formatter and validator

Read and repair structured JSON. Simple, private, right in your browser.

Pick up where you left offMy workspace →

Save the inputs and settings you choose. Nothing is uploaded until you select Save.

Save a file to your 5 MB cloud space

Choose a file explicitly. Your tool’s open files are never uploaded automatically. PDF, PNG, JPEG, WebP, TXT, CSV and JSON are supported.

Preparing your workspace…

A LITTLE GUIDANCE

How to use this tool

  1. Paste JSON or open a local JSON file.
  2. Choose formatted or compact output.
  3. Validate, then copy or download the result.

A worked example

A compact object becomes indented JSON without changing the numeric literal 9007199254740993.

What to know

Strict JSON only: comments, trailing commas and duplicate keys are rejected. Numeric text is preserved, including integers larger than JavaScript’s safe integer limit. Error messages include a line and column.

Supported inputs and limits

1,000,000 characters and 100 nesting levels.

Where is my data processed?

In your browser. Cloud saving is optional: only the supported inputs, settings or files you explicitly choose are uploaded. Download or save anything you want to keep before closing the page. Read our privacy details.

Further reading

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