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description=Format your JavaScript code online with our free tool. Clean, efficient, and easy to use.;

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Text of the page (random words):
javascript code formatter online tool w3docs w3docs books learn html learn css learn javascript learn git learn java learn php learn python courses quizzes exercises snippets tools general tools html editor password generator html encoder code diff json beautifier all 13 color tools color picker color converter color mixer color hex colors hsl all 10 string tools string length calculator md5 hash generator sha256 hash generator string reverse url encoder all 19 code formatters javascript formatter css formatter html formatter json formatter php formatter search w3docs k en english en deutsch de русский ru français fr español es português pt italiano it log in home tools code formatter tools javascript code formatter paste your javascript code and click format to clean it up with prettier tab size and for js ts trailing semicolons are configurable switch languages from the toolbar html css less scss javascript typescript json php format load example copy clear tab size semicolons about the javascript formatter this tool reformats javascript source code fixing indentation quote style spacing and line breaks without changing what the code does paste in code of any formatting quality minified inconsistently indented mixed quote styles and format rewrites it into one consistent style it understands jsx too so react component markup formats correctly use the language tabs above the editor to switch to the typescript json or other formatters without leaving the page formatting happens entirely in your browser the page dynamically imports prettier 3 s standalone build plus only the plugins this language needs babel to parse javascript into an abstract syntax tree and estree to print that tree back out so this tab doesn t load the php or html plugins the other formatter tabs use prettier reprints the whole file from that parsed tree rather than patching the original text which is why the output is identical regardless of how the input was originally formatted nothing you paste is sent to a server logged or stored reach for this with a minified bundle you need to read a snippet pasted from a chat or ticket with inconsistent indentation or a file a teammate hand formatted with the wrong quote style it also settles formatting arguments in code review since prettier s output is the same for everyone only two options are exposed here tab width and trailing semicolons every other rule including double quotes an 80 character print width and trailing commas uses prettier s default invalid javascript throws a syntaxerror naming the line and column instead of silently producing broken output examples minified function reformatted with default settings js before function greet name if name console log hello name else console log hello stranger after tab size 2 semicolons on the defaults function greet name if name console log hello name else console log hello stranger quotes are normalized to double quotes and every statement gets a trailing semicolon verified output of this tool s format button on the default settings long object literal wraps at 80 characters with trailing commas js before const config name demo retries 3 endpoints api users api posts api comments onerror function e console error e after const config name demo retries 3 endpoints api users api posts api comments onerror function e console error e prettier s 80 character print width forces one property per line once the object no longer fits and adds a trailing comma after the last property both are fixed behavior not something the ui can turn off semicolons toggle off with a 4 space tab width js tab size 4 semicolons unchecked function greet name if name console log hello name else console log hello stranger tab size and semicolons are the only two settings this page exposes every other prettier rule keeps its built in default frequently asked questions does formatting change how my javascript behaves no prettier parses your code into an abstract syntax tree and reprints that same tree so only whitespace quote style and line breaks change it never renames variables reorders logic or fixes bugs is my code uploaded to a server no formatting runs entirely in your browser prettier s standalone build loads client side and never makes a network request with your source reload the page and whatever you pasted is gone what s the difference between this and a linter like eslint prettier only rewrites formatting indentation quotes spacing and line breaks eslint instead checks for actual problems like unused variables or likely bugs and doesn t reformat your file by default many projects run both together can i format jsx or react components with this tool yes this formatter uses prettier s babel parser which understands jsx natively so react component code formats the same as plain javascript for typescript use the typescript formatter tab instead why did i get a syntaxerror instead of formatted code prettier must fully parse your code into a syntax tree before it can reprint it so invalid javascript like a missing bracket or comma throws a syntaxerror naming the exact line and column instead of guessing fix the reported spot and click format again related tools typescript formatter same prettier engine with the babel ts parser for typed code json formatter pretty print or minify a json payload or config file css formatter clean up stylesheets with prettier s css parser code diff checker compare two versions of a file to see exactly what formatting changed learn more lesson javascript functions function syntax basics the code shape this tool reformats lesson javascript objects object literal syntax behind the print width wrapping example above lesson working with json json stringify parse the data format the json formatter sibling tool targets w3docs free tutorials examples exercises snippets and quizzes for the web since 2014 books learn html learn css learn javascript learn git learn java learn php learn python practice exercises quizzes snippets try it editor tools html editor password generator html encoder code diff json beautifier company about contact privacy policy language english deutsch русский français español português italiano 2026 w3docs all rights reserved made for developers