---
title: "JSON Formatter and Validator With Line Numbers | ToolSugar"
description: "Format, minify and validate JSON in your browser. Pick 2 spaces, 4 spaces or tabs, and see the exact line and column of any syntax error."
canonical: https://toolsugar.com/tools/json-formatter
image: https://toolsugar.com/og.png
---

# JSON Formatter

This JSON formatter pretty prints, minifies and validates JSON inside your browser. Paste text or open a file, choose 2 spaces, 4 spaces or a tab, and the result updates live. When the JSON is broken, it reports the line and column of the first error. Nothing is uploaded.

Runs on your device

## How it works

1. Paste JSON into the JSON box, or use Or open a file to load a .json file.
2. Choose Format, Minify or Validate under Action.
3. For Format, pick 2 spaces, 4 spaces or Tab under Indent.
4. Read the result, then press Copy or Download.

## Key facts

- **Where it runs**: In your browser tab. The text and files you use are never uploaded.
- **Live result**: The output updates as you type or paste, with no button to press.
- **Errors**: The message names the line and column of the first problem, in every major browser.
- **Big numbers**: Integers beyond 9,007,199,254,740,991 lose digits because the browser reads numbers as doubles.

## Common uses

- Making a minified API response readable before you debug it.
- Shrinking a config file before you embed it in a request.
- Finding the stray comma that breaks a package.json or a payload.

## Questions

### Is my data sent to a server?

No. The conversion runs in your browser with JavaScript, so what you paste or open stays on your device. You can switch off your network after the page loads and it keeps working.

### How do I find the error in my JSON?

Paste it into the box. If it is invalid, the red message starts with the line and column of the first problem, for example Line 3, column 8, followed by what the parser expected.

### Does formatting change my data?

Only the whitespace changes. Keys keep their order and values stay the same, except that duplicate keys collapse to the last one and very large integers lose precision.

### Can it handle JSON with comments or trailing commas?

No. This tool follows strict JSON, so comments, single quotes and trailing commas are reported as errors with their position.

[Read the JSON Formatter guide](https://toolsugar.com/blog/how-to-format-json)

## Related tools

- [JSON Validator](https://toolsugar.com/tools/json-validator)
- [JSON to YAML](https://toolsugar.com/tools/json-to-yaml)
- [JSON to CSV](https://toolsugar.com/tools/json-to-csv)
- [SQL Formatter](https://toolsugar.com/tools/sql-formatter)