Free JSON Formatter Online

Beautify, minify, and validate JSON in your browser. Syntax highlighting, tree view, and diff. No signup—your data never leaves your device.

Input JSON

Formatted Output


                        

                        

                            

                        

                        

                            

                                

                                    
                                    
                                

                                

                                    
                                    
                                

                            

                            

                                
                                
                                
                            

                            

                        

                        
                    

                

            


            

                Also: Validator · Minifier · Diff · JSON to CSV · JSON to TypeScript
            


            
            

                
About the JSON Formatter Tool

                

                    Our free JSON formatter helps developers format, beautify, minify, and validate JSON data. Whether you're working with API responses, configuration files, or data exports, this tool makes JSON readable and helps you catch syntax errors quickly. All processing runs in your browser—your data never leaves your device. Explore more developer tools on World Wide Uptime, including IP lookup and monitoring resources.
                


                
What Is JSON and Why Format It?

                

                    JSON (JavaScript Object Notation) is a lightweight data format used everywhere: APIs, config files, databases, and front-end state. Minified JSON saves bandwidth but is hard to read. A JSON formatter (or beautifier) adds indentation and line breaks so you can inspect structure, debug payloads, and spot errors. This tool also validates JSON and reports the exact line and column of syntax errors—essential when you hit messages like "Unexpected token" or "JSON parse error at position."
                


                
Features

                
    
                    
  • JSON Beautify: Add indentation (2 or 4 spaces or tabs) and line breaks for readability
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  • JSON Minify: Remove unnecessary whitespace to reduce file size—use our dedicated JSON minifier page for minify-focused workflows
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  • Validate JSON: Check syntax and get line/column error location—or use our JSON validator page
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  • Compare JSON: See added, removed, and changed values side by side with our JSON diff tool
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  • Tree View: Collapsible expandable tree structure for large objects and arrays
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  • Sort Keys: Alphabetically sort object keys when formatting
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  • Fetch from URL: Load JSON directly from any API or URL (CORS-enabled)
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  • Download: Save formatted or minified JSON as a .json file
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  • Escape/Unescape Unicode: Convert between Unicode characters and \uXXXX notation, including surrogate pairs
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  • Syntax Highlighting: Color-coded keys, strings, numbers, and booleans
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  • Large File Protection: Inputs over 5MB are rejected to keep the browser responsive
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  • Privacy: All processing happens in your browser—no server uploads
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Common JSON Formatting Uses

                

                    Use this JSON formatter for API responses, package.json, tsconfig.json, environment configs, and any JSON data. Fix trailing commas, missing quotes, and other common JSON errors. The validator highlights the exact location of syntax errors to speed up debugging. For deeper guides on fixing errors, see our blog articles on JSON parse errors and validation in JavaScript.
                


                
How to Fix Common JSON Errors

                

                    Unexpected token: Usually a trailing comma, missing comma between properties, or a comment (JSON does not support comments). Remove trailing commas after the last array element or object property and ensure every key-value pair is separated by a comma. JSON parse error at position: Our formatter shows the line and column so you can jump straight to the offending character. Often it's an unescaped quote inside a string, a single quote instead of double, or an invalid number. Invalid JSON: Paste your string here and click Validate; we'll point you to the first error so you can fix it quickly.
                


                
Keyboard Shortcuts and Autosave

                

                    Use Ctrl+Enter (Windows/Linux) or Cmd+Enter (Mac) to format JSON. Use Ctrl+Shift+M to minify. Your input is automatically saved to your browser's local storage so you don't lose work if you refresh or close the tab.
                


                
When to Use a JSON Formatter vs. Validator vs. Minifier

                

                    This page does all three: format, validate, and minify. If you only need to validate JSON, our JSON validator page is tailored for that. If you only need to shrink payload size, the JSON minifier page focuses on minification. To compare two JSON files or API responses and see what changed, use the JSON diff tool. Each of these has its own SEO-friendly page and content so you can bookmark or share the exact tool you need.
                


                
Summary

                

                    A free JSON formatter online should be fast, private, and accurate. Ours runs entirely in the browser, shows line and column for parse errors, supports large inputs up to 5MB with safety guards, and includes a tree view and diff. Use it to beautify, minify, and validate JSON—and when you need a single-purpose workflow, try our dedicated validator, minifier, and diff pages. For more developer and monitoring tips, visit our blog and FAQ.