Nirmion
Help Find a tool

Developer & Data

JSON Formatter

Turn compact JSON into readable, validated two-space indentation without uploading it.

  1. 01Runs in this browser
  2. 02Limits are explicit
  3. 03Copy or download output

Step 1

Set up the source

Paste one JSON value. The example is ready to replace, and invalid text stays in place for correction.

Confirming the published workspace...

No black box

How this tool handles the input

The browser parses the complete value as JSON, then serializes the same data with two-space indentation. A successful format confirms syntax, not whether the fields match your application schema.

Before you start

What you need

One JSON object, array, string, number, boolean, or null value.

What you get

What the page gives back

Readable JSON that can be copied or downloaded as a .json file.

Keep in mind

Use the result responsibly

Formatting can change whitespace and numeric notation. Review large integers that JavaScript may not represent exactly.

Practical uses

Where this tool earns its place

  1. Review an API response before debugging it.
  2. Clean a compact configuration file for code review.
  3. Confirm whether pasted JSON is syntactically valid.

Verified data boundary

Source text stays on this page.

The published contract marks these tools as client-only processing. Nirmion uses the API only to confirm that this workspace is enabled in MySQL; source values and results are not sent to Flask.

Keep working

JSON ValidatorJSON Diff