Utilio
RU
Services
Guides
PDF Tools in Your Browser20
All PDF Tools in Your BrowserCompress PDFMerge PDFSplit PDFRotate PDFDelete PDF PagesExtract PDF PagesReorder PDF PagesPDF to WordWord to PDFPDF to JPGJPG to PDFPDF to PNGPNG to PDFPDF to ExcelExcel to PDFProtect PDFUnlock PDFSign PDFAdd Page NumbersWatermark PDF
Image Tools in Your Browser18
All Image Tools in Your BrowserCompress ImageResize ImageCrop ImageConvert ImageJPG to PNGPNG to JPGWebP ConverterHEIC to JPGImage to PDFBackground Color RemoverRemove Image MetadataRotate ImageFlip ImageWatermark ImageBlur ImageColor PickerImage UpscalerFavicon Generator
Text Tools in Your Browser18
All Text Tools in Your BrowserWord CounterCharacter CounterCase ConverterSort LinesRemove Duplicate LinesText CleanerText DiffFind and ReplaceLorem Ipsum GeneratorSlug GeneratorMarkdown to HTMLHTML to MarkdownList RandomizerReverse TextRemove Line BreaksAdd Line NumbersCSV to TableTitle Capitalizer
Developer Tools21
All Developer ToolsJSON FormatterJSON ValidatorJSON to YAMLYAML to JSONBase64 EncoderBase64 DecoderURL EncoderURL DecoderHTML EscapeJWT DecoderHash GeneratorTimestamp ConverterRegex TesterCron ParserUUID ValidatorDNS LookupHTTP Status CodesColor ConverterCSS MinifierJavaScript FormatterSQL Formatter
File Viewers in Your Browser8
All File Viewers in Your BrowserXLSX ViewerDOCX ViewerCSV ViewerPPTX ViewerJSON File ViewerVCF ViewerMarkdown ViewerText File Viewer
Generators in Your Browser18
All Generators in Your BrowserQR Code GeneratorPassword GeneratorUUID GeneratorUTM Link BuilderSEO Snippet GeneratorBarcode GeneratorRandom Number GeneratorRandom String GeneratorUsername GeneratorName GeneratorInvoice Number GeneratorRobots.txt GeneratorSitemap GeneratorMeta Tags GeneratorOpen Graph GeneratorSchema Markup GeneratorFake Data GeneratorCSS Box Shadow Generator

JSON File Viewer

Opens JSON files with validation, formatting, search, and top-level stats. It is for inspecting structured data files without pasting huge content into a text field.

Processing

Runs in your browser. The file and result are not sent to Utilio servers.

How Utilio handles dataWhy files stay on your devicePrivacy Policy

JSON File Viewer

Open JSON files with validation, formatted source, search, and top-level stats.

Preview

What to open next

Related tools and guides for the same job.

DOCX ViewerOpen a DOCX or Word attachment online on a shared or lightweight device.XLSX ViewerUse CSV Viewer for CSV or TSV exports.PPTX ViewerOpen a PPTX presentation online and review slide text from an attachment.VCF ViewerPreview a VCF attachment before adding contacts.JSON FormatterPretty-print a compact API response before reading it.CSV ViewerOpen a CSV file online before importing exported leads, orders, logs, or reports.

Helpful guides

Read more about this task, privacy, and common limits.

How to Open JSON Files Privately in Your BrowserOpen guide

What JSON File Viewer does

Use JSON File Viewer when you need to open exported API data, configs, fixtures, or logs.

When to use it

  • Open exported API data, configs, fixtures, or logs.
  • Search JSON files while keeping indentation readable.
  • Check whether a file is valid before handing it to another tool.

How to use it

  1. Choose the JSON file.
  2. Review validation status, formatted source, and stats.
  3. Use search to jump to keys or values.

What to check

  • Large JSON files can be memory-heavy in the browser.
  • Do not open files containing production secrets on shared devices.

Data, formats, and limits

What stays on your device and what is sent

Runs in your browser. The file and result are not sent to Utilio servers.

Supported formats

Supported: JSON, TXT. Not supported: YAML, XML, CSV, PDF.

File limits and browser requirements

  • Up to 40 MB per JSON or TXT file
  • Preview quality depends on browser parsing libraries and may not match desktop applications for complex files.
  • Large files can be slow because parsing, search, and rendering happen in the active browser tab.

Known limits

  • Preview quality depends on browser parsing libraries and may not match desktop applications for complex files.
  • Large files can be slow because parsing, search, and rendering happen in the active browser tab.

Troubleshooting

  • If the file does not open, check the extension, size, and save a simpler copy.
  • If a spreadsheet, document, or presentation looks different from the desktop app, verify the source file in the app that created it.
  • If search or preview feels slow, try a smaller file or close extra tabs.
All file viewersPrivacy PolicyHow Utilio handles data

Common questions

What does Utilio receive?

Runs in your browser. The file and result are not sent to Utilio servers.

What is it useful for?

Use it when you need to open exported API data, configs, fixtures, or logs. Start by choosing the JSON file.

Do I need an account?

No. You can use this tool without creating an account.

Can I use it on a phone?

Yes. For large files, complex previews, or careful review, a browser on a computer is usually more comfortable.

How do I get a reliable result?

Choose the JSON file. Then review validation status, formatted source, and stats. Large JSON files can be memory-heavy in the browser.

Which formats are supported?

JSON File Viewer supports JSON, TXT. It does not support YAML, XML, CSV, PDF.

What file size works best?

Up to 40 MB per JSON or TXT file. Browser memory and device speed can still affect large files.

Why did I not get the result I expected?

Preview quality depends on browser parsing libraries and may not match desktop applications for complex files. If the result still looks wrong, try a smaller or simpler input and review the output before using it.

Does Utilio use my input or results to train AI?

No. Utilio does not use files, pasted text, settings, generated values, or results from this tool to train AI models.