JSON Formatter Online - Free Browser Tool

Mode

Indent char

Indent size

Sort keys

Strip

Escaping

Parsing

Output

Input JSONJSON

Tip: use samples, upload, copy, download, and send-to actions inside the workspace where available.

What is JSON Formatter?

JSON Formatter is a free, in-browser tool to pretty-print, minify, and re-indent JSON safely. Paste valid or slightly-broken JSON and get clean, readable output instantly — with syntax-aware highlighting and one-click copy. Ideal for inspecting API responses and config files.

How to use JSON Formatter

1Paste your JSON into the input panel or drop a file.
2Choose how it should look — indentation, pretty-print vs. minify, and structure options.
3Copy the formatted output or download it for use in your project.

Features

Toggle between pretty-print and minify
Consistent, configurable indentation
100% client-side — no upload, fully private
Free with no account, no watermark, and no daily limit
Works on large inputs, limited only by your device's memory
Load a sample, then copy, download, or share your result

Common uses

Quick one-off formatter jobs without opening a heavy app
Preparing data before importing it elsewhere
Sharing a reproducible result with a teammate via a link

Used by

Backend developers
Frontend developers
QA engineers
Students
Developers
Technical writers

Examples

Example 1

Example input

{"id":1,"name":"Ava","plan":"Pro"}

Example output

{
  "id": 1,
  "name": "Ava",
  "plan": "Pro"
}

Example 2

Minified input

One-line content with no helpful spacing

Readable output

Indented output where nested structure is visible.

Example 3

Over-spaced input

Content with inconsistent line breaks and indentation

Normalized output

Consistent formatting that is easier to review and diff.

Example 4

Deeply nested input

A record with nested arrays, objects, clauses, or sections

Structured output

Nested levels are separated so each block is easier to inspect.

Example 5

Compact output request

Formatted content that needs to be pasted into a small field

Minified output

Whitespace is removed while the underlying value remains the same.

Common errors

Formatting is used before validating, so syntax errors remain hidden.
Minified output is pasted where humans still need to review it.
Tabs and spaces are mixed in a way that makes diffs noisy.
A formatter is expected to fix semantic data problems that require cleaning instead.

How it works

1Parses or tokenizes the JSON input.
2Applies consistent spacing, indentation, or compacting rules.
3Returns output without changing the meaning of the data.

Recommended workflow

1
Prepare the input
Format or minify the data before sharing it, committing it, or using it as a readable example.
2
Run JSON Formatter
Review the preview, copy or download the result, and keep everything local in your browser.
3
Next recommended tool
JSON Validator: Validate JSON syntax with helpful error messages.
Open tool
4
Then continue with
Fix Broken JSON: Repair trailing commas, single quotes, comments.
Open tool
5
Then continue with
JSON ↔ YAML: Convert between JSON and YAML in either direction.
Open tool

Frequently asked questions

How do I use JSON Formatter?: Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Pretty-print, minify, and indent JSON safely.
Is my data uploaded or stored anywhere?: No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.
Is JSON Formatter free?: Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.
What's the maximum file size?: There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.
Do I need to install anything?: No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.

Examples

Example 1

Example input

{"id":1,"name":"Ava","plan":"Pro"}

Example output

{
  "id": 1,
  "name": "Ava",
  "plan": "Pro"
}

Example 2

Minified input

One-line content with no helpful spacing

Readable output

Indented output where nested structure is visible.

Example 3

Over-spaced input

Content with inconsistent line breaks and indentation

Normalized output

Consistent formatting that is easier to review and diff.

Example 4

Deeply nested input

A record with nested arrays, objects, clauses, or sections

Structured output

Nested levels are separated so each block is easier to inspect.

Example 5

Compact output request

Formatted content that needs to be pasted into a small field

Minified output

Whitespace is removed while the underlying value remains the same.

Recommended workflow

Prepare the input

Format or minify the data before sharing it, committing it, or using it as a readable example.

Run JSON Formatter

Review the preview, copy or download the result, and keep everything local in your browser.

Next recommended tool

JSON Validator: Validate JSON syntax with helpful error messages.

Open tool

Then continue with

Fix Broken JSON: Repair trailing commas, single quotes, comments.

Open tool

Then continue with

JSON ↔ YAML: Convert between JSON and YAML in either direction.

Open tool

Frequently asked questions

How do I use JSON Formatter?

Paste or drop your data into the workspace, adjust the options to fit your data, then copy or download the result. Pretty-print, minify, and indent JSON safely.

Is my data uploaded or stored anywhere?

No. Everything runs locally in your browser — your data is never uploaded to a server. Nothing is sent to a server, so it's safe to use with private or sensitive data.

Is JSON Formatter free?

Yes — it's completely free with no account, no sign-up, no watermark, and no daily usage limits.

What's the maximum file size?

There's no hard limit imposed by the tool. Because processing happens in your browser, the practical ceiling is your device's available memory — most everyday files work instantly.

Do I need to install anything?

No installs and no extensions — it runs entirely in your web browser and even works offline once the page has loaded.