JSON Formatter
Validate, format, and transform JSON — with error highlighting, TypeScript generation, key sorting, and flattening.
Key Features
Smart Code Checker
Our tool checks your data for mistakes as soon as you type or paste it. It acts like a helper that reads your code line-by-line. If you miss a quote, add an extra comma by accident, or mismatch curly braces, the tool immediately highlights that exact spot with a red line. It also shows a clear error message in plain language explaining what is wrong and how to fix it. This means you do not have to spend hours searching through lines of code to find a single missing bracket.
TypeScript Generator
Convert your JSON data into clean TypeScript code in seconds. When building apps, writing interfaces and type definitions by hand takes a long time and is easy to get wrong. This feature looks at your data, handles deeply nested objects, and automatically builds ready-to-use TypeScript interfaces. You can customize the name of the main interface, and the tool will update all related references instantly. Once generated, you can copy the code to your clipboard with a single click.
View Data Folders
Explore large and complex data structures without getting lost. Our visual tree viewer lets you collapse and expand sections of your JSON so you can focus on the parts that matter. You can also search for specific keys or values. Click on any item to automatically copy its code path, which makes programming your frontend apps much faster. This helper visualizes your data as an interactive list, making it easy to understand the structure of complex data.
Flatten Data Lists
Turn deeply nested JSON structures into a simple, single-level list. You can choose character separators like dots, slashes, or underscores to split the levels. This is helpful when you are creating configuration settings, dashboard lists, or translation files. Whenever you want, you can reverse the process and turn the flat list back into its original nested shape. It simplifies complex configurations so they can be read easily by simple application tools.
Sort Alphabetically
Keep your data clean and organized by sorting all object keys alphabetically (from A to Z or Z to A). Sorting your keys makes it much easier to compare changes in your version control system, like Git. It removes useless line changes and visual noise, allowing you and your team to review code edits quickly and avoid merge conflicts. The tool recursively sorts every single nested level of your JSON automatically.
Format & Compress
Switch instantly between a readable layout and a compact minified format. You can adjust the indentation size to use 2, 4, 6, or 8 spaces, or tabs to match your team's code guidelines. If you need to send the data over the internet, minify it with one click to remove all spaces, comments, and empty lines to save bandwidth and improve page load speeds for your users.
Secure & Private
Your data stays completely safe and private. This utility runs entirely inside your web browser, which means none of your text, files, or keys are sent to external databases or servers. You can load and edit sensitive information, private API keys, or personal logs without any fear of tracking, data storage, or accidental online leaks. It works entirely offline once the page is loaded.
Fast Workflow
Work faster with built-in history and keyboard shortcuts. The tool saves your changes automatically as you edit, allowing you to undo or redo actions using standard commands if you make a mistake. When you are finished, you can copy the entire output in one click or download it as a custom file directly to your device. This ensures you can edit, format, and save files without interruptions.
Usage Examples
{
"id": 101,
"meta": {
"active": true,
"tags": ["dev", "web"]
}
}export interface Root {
id: number;
meta: Meta;
}
export interface Meta {
active: boolean;
tags: string[];
}Common Use Cases
Quick Error Fixing
When you are building a website or app and a server message fails, it can be hard to find the mistake in a huge block of text. Simply paste the text into our editor. The tool checks the structure and points out the exact line and character where the error is. It highlights common spelling mistakes like missing brackets or extra commas. This lets you fix settings quickly before sharing updates with your users, preventing errors that could crash your website.
Quick Setup for Apps
Programmers often spend a lot of time writing data blueprints by hand. Instead of doing this manually, you can paste your data into the editor. The tool generates clean, ready-to-use code blueprints instantly, matching all properties. You can also explore the visual data folders and click on any item to copy its path. This helps you write correct code without typing errors, saving you valuable time and preventing spelling issues.
Clean Up Messy Settings
Managing settings files or reading server reports can be difficult when they are all on a single line or disorganized. You can use this tool to clean up your files and make them easy to read. By sorting names alphabetically, you keep files in a neat, consistent order. This makes comparing different file versions simple. You can also flatten your data folders to create simple settings lists, keeping your workspace organized.
How It Works
Input Your Data
Get started by entering your data into the editor. You can paste text directly, drag and drop a local file (we support large files up to 50MB), or load content directly from a public URL. The editor loads the content instantly and prepares the text buffer. It handles file reading securely right inside your web browser, keeping your data confidential throughout the formatting process without sending files to any third-party server.
Parse & Validate
Our checker reads your text every time you make a change. If there are typos, it flags them immediately. It highlights the exact line with a red color and explains what is wrong in plain language. It also gives you helpful suggestions, like removing an extra comma, to help you fix the issue quickly.
Transform & Explore
Once your data is valid, you can explore it in different ways. Switch to the Tree view to collapse and expand nested objects, or search for specific values. You can also apply settings to sort all keys alphabetically, generate TypeScript code, or flatten the structure. The changes are computed instantly and displayed in the output panel in real time, letting you see the results of your edits as you work.
Export Locally
Format the final code using your preferred spacing options (like 2 or 4 spaces) or minify it to compress the file size. When you are happy with the result, you can copy it to your clipboard or download it as a file (like `.json` or `.ts`). Since everything happens in your browser, your data is never stored, maintaining absolute privacy and allowing you to safely handle sensitive backend configurations.
Frequently Asked Questions
No. Standard data files (JSON) do not allow comments or extra commas at the end of lists. If your data contains them, our checker flags them as mistakes. The tool will show a warning pointing to the exact line and explain that you need to remove the extra comma or comments. This helps you clean your files so they follow standard rules, preventing errors when loading files in your apps.
When you switch to the Tree view, the tool displays a visual layout of your data. Simply hover over any key or value and click it. The tool instantly calculates the exact access path (such as `user.profile.emails[0]`) and copies it to your clipboard. This is a great time-saver for developers writing code to read nested values, as it eliminates typos and ensures accurate data mapping in your JavaScript, TypeScript, React, or Python applications.
No, the data must be valid before formatting can take place. The tool needs to understand the layout of the data to layout the spacing and indentation correctly. If there are errors, the tool will disable formatting options and show you where the issues are in the 'Error Details' panel. Once you fix the highlighted errors, the formatter will automatically beautify or minify your code. This ensures that you do not generate broken files.
Yes, you can format files up to 50MB directly in the app. The formatting engine is optimized to handle large files efficiently in the browser without causing the interface to freeze. Since all calculations run locally on your device, the processing speed depends on your browser's performance and your computer's speed. Your files are never uploaded to any server, so you can safely work with large database backups, server logs, or telemetry data.
The sorting tool works through all levels, which means it organizes keys alphabetically at every level of your data. It starts with the main keys and then goes down into every nested object. You can sort keys in ascending order (A to Z) or descending order (Z to A). This is useful when working in teams, as it keeps your configuration files in a consistent order, reducing file conflicts and visual clutter. Lists are not sorted to keep their original order.
Yes, you can use this tool completely offline once the page has loaded in your browser. All of the validation, formatting, minification, and code generation logic runs completely on your own device using client-side JavaScript. It does not make any requests to external servers to parse your data, making it highly reliable and safe to use even when you do not have an active internet connection. This is perfect for work when traveling or in high-security offline environments.
Formatting adds indentation, line breaks, and spaces to make JSON files easy for humans to read and understand. You can customize the indent size to match your style. Shrinking (minifying) does the opposite: it removes all line breaks, comments, and empty spaces to make the file as small as possible. Minified files are ideal for sending data over the web because they load faster and use less bandwidth.
If an array contains different types of values (such as strings, numbers, and objects), the generator recursively inspects each item. It combines the types logically. For example, if an array has both strings and numbers, it generates a type like `(string | number)[]`. If it finds complex nested objects, it builds separate interfaces for them and references them correctly in the parent definition, keeping your code clean and type-safe.
Yes, when you use the 'Load URL' feature, the browser fetches the data directly to your local editor. The tool does not route the request through any third-party servers. Since the network request runs on your machine and the parsing happens entirely in your local browser tab, your data remains secure and private. Note that the target server must allow access permissions for this to work, otherwise the browser will block the load request.
Yes, the tool detects duplicate names in the same object block. Standard specifications state that names should be unique within an object. If the parser finds two names with the exact same spelling, it will show a warning in the issues panel. This helps you clean up duplicate properties which can cause unexpected behavior in apps and databases, as different libraries resolve duplicates differently.