Developer tools/ JSON Formatter

JSON Formatter

Format messy JSON into clean, readable text, check for syntax errors, or minify JSON in seconds. Copy or download your results directly from your browser.

✓ No file uploads ✓ No sign-up ✓ Free to use

1. Enter your JSON

Paste valid JSON or enter data to check its syntax.

JSON input

Maximum 2 MB of UTF-8 text 0 B / 2 MB

2. Choose an action

Check the syntax or transform your JSON.

Indentation

3. Your JSON result

Copy, download or inspect the processed data.

Processed JSON

No result 0 B

JSON overview

Details about the successfully processed JSON.

Root Type—

Top-Level Items0

Output Size0 B

How to use

1Paste JSON into the input editor.
2Choose an indentation style.
3Click Format, Validate or Minify.
4View the result as text or an expandable tree.
5Copy, download or reuse the result.

Private JSON processing

This widget parses and transforms your JSON locally in the browser. It does not upload the input, use analytics, or store your data on a remote server.

Valid JSON example

{
  "name": "I Love Tools",
  "active": true,
  "tools": [
    "JSON Formatter",
    "Word Counter"
  ],
  "version": 1
}

Good to know

JSON requires double-quoted property names and strings.
Comments and trailing commas are not valid JSON.
Validation reports parser errors without creating output.
Formatting and minifying can change numeric precision and duplicate-key behavior.
Large trees are limited in the viewer to keep the page responsive.

A LITTLE KNOW-HOW

JSON Formatter Online – Format, Validate & Minify JSON

About This JSON Formatter

The free JSON Formatter from I Love Tools helps you organize, validate and minify JSON data directly in your web browser.

JSON, or JavaScript Object Notation, is a widely used format for exchanging structured data between applications, websites and APIs. Although JSON is easy for software to process, large or compact JSON documents can be difficult for people to read.

Our online JSON Formatter makes that information easier to understand. Simply paste your JSON into the editor and click Format JSON to create an indented, readable version.

You can also check whether your JSON is valid, remove unnecessary whitespace with the Minify JSON option, or explore nested objects and arrays using the expandable tree view.

The tool supports copying and downloading processed JSON, making it useful for developers, students, website administrators and anyone working with structured data.

Frequently asked questions

Is the JSON Formatter free?

Yes. The I Love Tools JSON Formatter is free to use in your browser without creating an account or installing additional software.

How do I format JSON online?

Paste your JSON into the input editor, choose an indentation style, and click Format JSON. The readable result appears in the output section.

Can the tool validate JSON?

Yes. Click Validate JSON to check the syntax. If the input is invalid, the tool displays an error message supplied by the browser parser, with position information when available.

What does minify JSON mean?

JSON minification removes unnecessary formatting whitespace to produce a compact representation of the data. It is commonly used when readability is less important than compact output.

Can I download formatted JSON?

Yes. After formatting or minifying valid JSON, click Download JSON to save the result as a .json file.

Is my JSON data uploaded to a server?

No. The widget parses and processes JSON locally in your browser. It does not upload the input or save it in remote storage.