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Tools

JSON Formatter

For developers

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Format, minify and validate JSON.

Result 

    
Processing happens in your browser — the data is never sent anywhere. If the JSON is broken we show the exact line and character of the error.







        


                        

            

    

        
Why format JSON

        
API data arrives as one long line. Reading it in that state is impossible.

        

            

                Find the field you need
                In a response of hundreds of characters the value you want is lost. Indented, the structure is obvious.
            

            

                Spot a syntax error
                A stray comma or unclosed bracket breaks the whole file. Formatting shows exactly where.
            

            

                Compare two responses
                Consistently formatted data is easy to compare line by line to see what changed.
            

            

                Validate structured data
                Structured data for Google is JSON too. One error and the block is ignored entirely.
            

        

    

    

        
The most common JSON errors

        

            

                A trailing comma
                JavaScript allows it, JSON does not. The single most common reason a file fails to parse.
            

            

                Single quotes
                JSON accepts double quotes only. A fragment copied from code often breaks for this reason.
            

            

                Comments
                JSON has none. A line of explanation invalidates the entire file.
            

            

                An unescaped character
                Quotes or a backslash inside text must be escaped, or the string ends early.
            

        

    



        

        
                
                

            
FAQ

                            

                    Why does my JSON fail validation?
                    
Three causes cover almost every case. First, a trailing comma before a closing bracket: allowed in JavaScript, not in JSON. Second, single quotes: the standard requires double quotes for both keys and strings. Third, comments: they do not exist in JSON at all, even though editors often highlight them as valid. We show the line number and position, so there is nothing to hunt for.

                

                            

                    Why minify JSON into one line?
                    
To reduce the size of a server response. Indentation and line breaks can take up to a third of the file while meaning nothing to a machine. For APIs, production configs and data embedded in a page this is a noticeable saving. Keep the formatted version for humans and for version control, where line-by-line diffs matter.

                

                            

                    Is it safe to paste real data here?
                    
Yes. Parsing and formatting run entirely in your browser using JavaScript itself — no request is made to any server. You can confirm this by opening the Network tab in developer tools: nothing appears there while you work. This matters because JSON often contains tokens and API keys.

                

                    

                    

        

    































    

                
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