JSON Formatter & Validator
Paste your JSON below to format, validate, minify, or explore it as a tree. Completely free, runs entirely in your browser.
Input
Output
Paste your JSON below to format, validate, minify, or explore it as a tree. Completely free, runs entirely in your browser.
JSON (JavaScript Object Notation) is a lightweight data-interchange format that is easy for humans to read and write and easy for machines to parse and generate. It is based on a subset of the JavaScript programming language and has become the dominant format for transmitting data between a server and a web application. JSON uses key-value pairs enclosed in curly braces for objects and square brackets for ordered lists (arrays). Values can be strings, numbers, booleans, null, objects, or arrays, making it flexible enough to represent almost any structured data.
Using the DOLY Studio JSON Formatter is straightforward. Simply paste your raw or minified JSON into the input panel on the left side of the editor. Then click the Format button to beautify the data with your chosen indentation level (2 spaces, 4 spaces, or tabs). If your JSON contains errors, the tool will display a clear error message indicating the exact line number and character position where the problem occurs, so you can fix it quickly. You can also use the Minify button to compress your JSON into a single line, which is useful for reducing payload size before sending data over the network. The Tree View toggle lets you explore your data in a collapsible tree structure, making it easier to navigate deeply nested objects. When you are satisfied with the result, click Copy to copy the formatted output to your clipboard.
Working with raw, unformatted JSON is tedious and error-prone. A single missing comma, an extra bracket, or an unescaped character can break an entire API response or configuration file. Formatting JSON with proper indentation makes the structure immediately visible, allowing developers and analysts to spot issues at a glance. Validation goes a step further by verifying that the data conforms to the JSON specification defined in RFC 8259. Whether you are debugging an API response, preparing configuration files for deployment, or inspecting data exported from a database, a reliable formatter and validator saves time and prevents costly mistakes.
Your data never leaves your browser. All formatting, validation, and tree-view rendering happen entirely on the client side using JavaScript. No data is uploaded to any server, so you can safely paste sensitive or proprietary JSON without any privacy concerns.
Because the tool runs in your browser, the practical limit depends on your device's available memory. Most modern browsers can handle JSON files up to several megabytes without any issues. For extremely large files (above 10 MB), you may experience slower rendering times, especially when using the tree view feature.
The validator detects all syntax errors defined by the JSON specification, including missing or extra commas, unmatched brackets and braces, improperly quoted keys or string values, trailing commas, single-quoted strings, and invalid escape sequences. Each error message includes the line number and character position to help you locate and fix the problem quickly.
Yes. The JSON Formatter is fully responsive and works on smartphones and tablets. On smaller screens, the input and output panels stack vertically for easier use, and the sidebar advertisements are hidden to maximize your working area.