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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.





        


                
                

            
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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