Visualizer for Developers

Instantly view, format, and validate Markdown and JSON files in your browser. No setup, just drop and dive in.

description

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Drop your files here

Supports .md, .markdown, .txt, and .json files. Your data stays private and never leaves your browser.

Why Use Dev Viewer?

speed

Instant Loading

Pure client-side processing means zero latency. Your large files load and format in milliseconds.

auto_fix_high

Auto Formatting

Messy JSON? We'll prettify it automatically. Markdown is rendered with a clean, readable typography.

security

Local & Secure

Files are never uploaded to any server. Complete privacy for your sensitive configuration and data.

Frequently Asked Questions ▼

What is Dev Viewer?

Dev Viewer is a free online tool to preview, format, validate, and explore Markdown and JSON files in interactive views. It runs entirely in your browser.

How do I use the JSON Formatter?

It's simple! Paste your messy or minified JSON into the input area, or upload a .json file. Dev Viewer automatically formats it with proper indentation and highlights syntax colors.

You can also click the "Format" button in the toolbar to re-format code at any time.

How does the Auto-Repair feature work?

If you have invalid JSON (e.g., missing quotes, trailing commas, or single quotes), just paste it in. The "Auto-Repair" button will attempt to fix these common syntax errors automatically, rendering your data instantly.

What visualization modes are available?

We offer four powerful views:

Tree View: Collapsible node explorer (default).
Prettier: Clean, code-colored text view.
Graph: Interactive node-link diagram for visualizing relationships.
Table: Grid view for array data.

Is my data secure?

Yes, absolutely. Dev Viewer processes all data locally in your browser. Your files and JSON content are never uploaded to any server.

Can I export the results?

Yes. You can download your Markdown as HTML or export your JSON data as a CSV file (standard or flattened) for use in Excel or Google Sheets.

Is Dev Viewer free?

Yes, it is completely free to use with no limits on file size or usage.

Visualizer for Developers

Drop your files here

Why Use Dev Viewer?

Instant Loading

Auto Formatting

Local & Secure

📝 JSON Input

📊 Visualization

💻 Code Helper

Visualizer for Developers

Drop your files here

Why Use Dev Viewer?

Instant Loading

Auto Formatting

Local & Secure

📝 JSON Input

📊 Visualization

💻 Code Helper

📋 Paste JSON

📥 Export to CSV