JSON Formatter & Validator

Format, beautify, validate and minify JSON online. Free browser-based JSON formatter with error location, tree view and local processing.

Local Browser Engine

Indent Auto

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JSON Input

Paste JSON, JSONC, or upload a file

Characters: Bytes:

Derived result

Validate JSON to inspect its tree.

Characters: Bytes:

Safe repair preview

Only proposed changes are shown. The original input is never overwritten automatically.

No safe repair proposal was detected.

JSON comparison

Compare parsed JSON structurally or compare source text.

Developer conversions

Convert validated JSON to common data and type formats.

Diagnosis

Structure

Depth Objects Arrays Keys Values

Tools

Privacy-first All processing runs in your browser. JSON is not transmitted or stored by this tool.

Ctrl/Cmd + Enter

⚡

Fast to use

Designed to help you complete the task without unnecessary steps.

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Works in your browser

No separate desktop software is needed for this online tool.

✓

Simple workflow

Enter your information, use the tool and work with the result.

JSON Formatter, Beautifier and Validator

A JSON formatter makes structured JSON data easier to read, inspect, and work with. AabiTech's JSON Formatter lets you paste JSON, format it into a readable structure, validate its syntax, minify it, and inspect nested objects and arrays using a convenient tree view.

The tool is useful when working with API responses, configuration files, web development projects, debugging data, and JSON copied from applications or developer tools. Formatting adds indentation and line breaks without changing the underlying JSON data, while validation helps identify invalid JSON syntax. When API data contains encoded values, developers may also need a Base64 encoder to encode or decode Base64 text separately.

JSON frequently appears alongside URLs, query parameters, and API requests. If a URL contains characters that need to be safely represented inside a request or data structure, a URL encoder and decoder can be useful alongside a JSON formatter.

Processing is designed to happen directly in your browser, so the tool can work without requiring your JSON to be uploaded to AabiTech's servers.

How to Format JSON Online

Formatting JSON with AabiTech is a simple three-step process:

Enter your JSON: Paste JSON into the editor or open a JSON file from your device.
Format or validate: Use Format to beautify the JSON or Validate to check whether the JSON syntax is valid.
Use the result: Copy the formatted JSON, download it, switch to a compact version with Minify, or inspect the data using the tree view.

If the JSON contains a syntax error, the formatter provides an error message to help you locate the problematic area. Correct the JSON and run the formatter or validator again. For API payloads containing authentication data, you can separately use a JWT decoder when you need to inspect the contents of a JSON Web Token.

JSON Formatter Features

Format and Beautify JSON

Convert compact or difficult-to-read JSON into a clean, indented structure. Choose the indentation level that fits your workflow. This is especially useful when inspecting structured data returned by APIs or development tools.

Validate JSON Syntax

Check whether your JSON follows valid JSON syntax before using it in an application, API request, configuration file, or development workflow.

Minify JSON

Remove unnecessary whitespace and formatting from valid JSON when you need a compact representation.

JSON Tree Viewer

Explore nested JSON objects and arrays through a tree-based view. This can make large API responses and deeply nested data easier to inspect.

JSON File Formatting

Open a supported JSON file directly in the browser and work with its contents without manually copying the entire file into the editor.

Copy and Download

Copy the formatted result to your clipboard or download the processed JSON for use in another application or development workflow.

When to Use a JSON Formatter

A JSON formatter is particularly useful when JSON has been returned as a single long line, contains inconsistent indentation, or is difficult to inspect manually.

API development: Format API responses so objects and arrays are easier to inspect.
Debugging: Make structured data easier to examine while troubleshooting an application.
Configuration files: Improve readability when working with JSON-based configuration.
Web development: Inspect JSON used by JavaScript applications and web APIs. When working with frontend markup, an HTML beautifier can be useful for formatting the related HTML source.
Data inspection: Explore nested objects and arrays without manually searching through a long JSON string.
Pattern testing: When JSON contains strings that need pattern matching or extraction, a regex tester can help test regular expressions separately from the JSON validation process.
Before deployment: Validate JSON syntax before placing data into an application or configuration file.

Privacy

Privacy and Browser-Based JSON Processing

AabiTech's JSON Formatter is designed for browser-based processing. The JSON you enter can be processed directly on your device without needing to upload the content to AabiTech's servers.

This approach is useful when working with JSON that you do not want to send to an external processing service. However, you should still avoid entering passwords, API keys, access tokens, personal information, or other sensitive data into any online service unless you understand how that service handles the information.

The tool's browser-based processing is intended to provide a convenient way to format, validate, minify, and inspect JSON while keeping unnecessary data transfer to a server out of the workflow.

Questions & answers

Frequently Asked Questions

What is a JSON formatter?

A JSON formatter converts JSON into a more readable structure by adding indentation and line breaks. It does not change the meaning of valid JSON; it makes the structure easier to read and inspect.

How do I format JSON online?

Paste your JSON into the AabiTech JSON Formatter and choose Format. The tool parses the JSON and displays it with readable indentation. If the JSON is invalid, the tool reports an error so you can correct the syntax.

Can I validate JSON with this tool?

Yes. Use the Validate option to check whether the JSON follows valid JSON syntax. If a problem is detected, the tool provides an error message that can help you identify where the invalid JSON occurs.

Can I minify JSON with the JSON Formatter?

Yes. The Minify option removes unnecessary whitespace and formatting from valid JSON, producing a compact representation that is useful when a smaller JSON representation is required.

Can I view JSON as a tree?

Yes. The JSON Formatter includes a tree view that lets you inspect nested objects and arrays in a more visual structure. This can be especially useful when working with large or deeply nested JSON data.

Is my JSON uploaded to AabiTech?

The JSON Formatter is designed to process your input directly in your browser, so the JSON does not need to be uploaded to AabiTech's servers for formatting, validation, minification, or viewing.

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