The free online JavaScript Beautifier/Formatter lets you format, modify, view, analyze, and make JavaScript programs seem nicer. It is a quick and easy method for formatting and making JavaScript code more aesthetically pleasing for teamwork.

JavaScript Beautifier

`.trim(); jsPreview.srcdoc = previewDocument; setStatus(\"JavaScript frontend preview displayed.\"); return true; } function showPreview() { renderJSPreview(); } /* ========================================================= DOWNLOAD / COPY HELPERS ========================================================= */ function triggerDownload(content, fallbackName) { if (!content.trim()) return false; let name = currentFileName || fallbackName; name = name.replace(/[<>:\"/\\\\|?*\\x00-\\x1F]/g, \"\"); name = name.replace(/\\.(js|mjs|cjs|txt)$/i, \"\"); name += \".js\"; const blob = new Blob([content], { type: \"text/javascript;charset=utf-8\" }); const url = URL.createObjectURL(blob); const link = document.createElement(\"a\"); link.href = url; link.download = name; document.body.appendChild(link); link.click(); link.remove(); setTimeout(function() { URL.revokeObjectURL(url); }, 100); return name; } async function copyTextToClipboard(text, btnElement) { if (!text.trim()) return false; try { if (navigator.clipboard && window.isSecureContext) { await navigator.clipboard.writeText(text); } else { const textarea = document.createElement(\"textarea\"); textarea.value = text; textarea.style.position = \"fixed\"; textarea.style.left = \"-9999px\"; document.body.appendChild(textarea); textarea.select(); document.execCommand(\"copy\"); textarea.remove(); } const originalText = btnElement.textContent; btnElement.textContent = \"Copied\"; setTimeout(function() { btnElement.textContent = originalText; }, 1500); return true; } catch (error) { console.error(error); return false; } } /* ========================================================= EVENT HANDLERS ========================================================= */ formatBtn.addEventListener(\"click\", formatJS); minifyBtn.addEventListener(\"click\", minifyJS); viewerBtn.addEventListener(\"click\", function() { const previewIsVisible = !previewContainer.classList.contains(\"preview-hidden\"); if (previewIsVisible) showCodeView(); else showPreview(); }); codeModeBtn.addEventListener(\"click\", showCodeView); previewModeBtn.addEventListener(\"click\", showPreview); refreshPreviewBtn.addEventListener(\"click\", function() { renderJSPreview(); setStatus(\"Preview refreshed.\"); }); uploadBtn.addEventListener(\"click\", function() { fileInput.click(); }); fileInput.addEventListener(\"change\", function(event) { const file = event.target.files[0]; if (!file) return; const extension = file.name.split(\".\").pop().toLowerCase(); const allowedExtensions = [\"js\", \"mjs\", \"cjs\", \"txt\"]; if (!allowedExtensions.includes(extension)) { setStatus(\"Only JS, MJS, CJS and TXT files are supported.\"); fileInput.value = \"\"; return; } if (file.size > 10 * 1024 * 1024) { setStatus(\"Maximum file size is 10 MB.\"); fileInput.value = \"\"; return; } const reader = new FileReader(); reader.onload = function(e) { inputCM.setValue(e.target.result); outputCM.setValue(\"\"); downloadBtn.disabled = true; currentFileName = file.name.replace(/\\.[^/.]+$/, \"\"); fileName.textContent = \"Loaded: \" + file.name; showCodeView(); updateOutputStats(); setStatus(\"JavaScript file uploaded successfully.\"); inputCM.focus(); }; reader.onerror = function() { setStatus(\"Unable to read selected file.\"); }; reader.readAsText(file); fileInput.value = \"\"; }); /* Input Panel Actions */ loadSampleBtn.addEventListener(\"click\", function() { inputCM.setValue(defaultJs); formatJS(); setStatus(\"Sample code loaded and Beautifier.\"); }); copyInputBtn.addEventListener(\"click\", async function() { const content = inputCM.getValue(); if (!content.trim()) { setStatus(\"Nothing to copy.\"); return; } const success = await copyTextToClipboard(content, copyInputBtn); if (success) { setStatus(\"Input JavaScript copied to clipboard.\"); } else { setStatus(\"Unable to copy input JavaScript.\"); } }); downloadInputBtn.addEventListener(\"click\", function() { const content = inputCM.getValue(); if (!content.trim()) { setStatus(\"Nothing to download.\"); return; } const name = triggerDownload(content, \"input\"); setStatus(\"Downloaded: \" + name); }); /* Output Panel Actions */ copyBtn.addEventListener(\"click\", async function() { const content = outputCM.getValue() || inputCM.getValue(); if (!content.trim()) { setStatus(\"Nothing to copy.\"); return; } const success = await copyTextToClipboard(content, copyBtn); if (success) { setStatus(\"Beautifier JavaScript copied to clipboard.\"); } else { setStatus(\"Unable to copy JavaScript.\"); } }); downloadBtn.addEventListener(\"click\", function() { const content = outputCM.getValue(); if (!content.trim()) { setStatus(\"Nothing to download.\"); return; } const name = triggerDownload(content, \"formatted\"); setStatus(\"Downloaded: \" + name); }); clearBtn.addEventListener(\"click\", function() { inputCM.setValue(\"\"); outputCM.setValue(\"\"); currentFileName = \"formatted\"; fileName.textContent = \"No file loaded\"; downloadBtn.disabled = true; jsPreview.srcdoc = \"\"; showCodeView(); updateOutputStats(); setStatus(\"Editor cleared.\"); inputCM.focus(); }); // 1. Get a reference to the select element const indenSelect = document.getElementById(\'indentType\'); indenSelect.addEventListener(\'change\', (event) => { // const selectedValue = event.target.value; formatJS(); }); /* ========================================================= INITIAL FORMAT ========================================================= */ formatJS();

For formatting and beautifying JavaScript code, our online JavaScript code Beautifier and beautifier is the greatest solution available for programmers.

How the JavaScript Beautifier Is Used

Use this online JS beautifier by following these instructions:

Step 1: Enter the code for JavaScript in the first box. You may upload the JavaScript code file, create the code, or copy and paste it.

Step 2: To format JavaScript code, click the “format” button.

Step 3: The JavaScript code will now be Beautify by the utility. The time may vary depending on the amount of the code, but it is often completed in a matter of seconds.

Step 4: The second box displays the Beautify JavaScript code. You can go over the findings and see whether they meet your needs.

Key Features

Spacing: If you want to adjust code indent size, select Space size.

Minify Code: JavaScript Beautifier Minify button is for Minifying JavaScript Code.

Copy Code: Use this button for Beautify JavaScript Code.

Upload JS File: There are 2 options for Code formatting. Paste directly your code in first code box and upload JavaScript Code File from your device.

Extra Line: If you want to remove Extra Lines from your JavaScript Code, check Remove Extra Lines box.

Reset: Reset both code boxes for formatting new code.

Use our other useful HTML Beautifier.

Un-Beautify JavaScript Code

Beautifier JavaScript Code