OK Tools

Free browser tool

Free JSON Formatter & Validator

Pretty-print, minify, and validate JSON instantly — fully client-side.

JSON input

100% client-side. Your JSON never leaves this device.

About this JSON formatter

Paste or type JSON to pretty-print it with readable indentation, minify it for production, or validate that it parses correctly.

Everything runs locally in your browser — nothing is uploaded to a server.

When you need agent-assisted browser workflows beyond a single tool, try okayok.ai.

Why format JSON here

Private by design

Your JSON stays in the browser. Nothing is sent to our servers.

Format, minify, validate

Three actions in one lightweight page — no signup required.

Works on mobile

Responsive layout so you can fix JSON from phone or desktop.

Related utilities

Jump to Base64, video tools, and more from the related links below.

How to use

  1. 1

    Paste your JSON

    Drop text into the input area.

  2. 2

    Choose an action

    Format for readability, minify to shrink, or validate syntax.

  3. 3

    Copy the result

    Use the copy button when the output looks right.

FAQ

More utility tools

JSON Validator

Validate JSON and highlight error line/column.

JSON Tree View

Explore JSON as a collapsible, syntax-highlighted tree.

JSON Diff

Compare two JSON docs and highlight key-path changes.

Base64 Encode / Decode

Encode or decode Base64 text with UTF-8 in your browser.

More from Okay OK

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Visit okayok.ai