Is FileHoot a free JSON editor?

Yes! FileHoot is a completely free online JSON editor, JSON validator, and JSON formatter. You can edit, validate, format, and repair JSON files directly in your browser with no cost, no signup, and no uploads required.

How do I validate JSON online?

Simply paste your JSON into FileHoot or drag-and-drop a JSON file. FileHoot instantly validates your JSON, highlights any syntax errors with line numbers, and offers automatic fixes. It's a free JSON validator that works entirely in your browser.

Can FileHoot lint and format YAML files?

Yes! FileHoot includes a full YAML editor, YAML validator, YAML linter, and YAML formatter. Paste or upload YAML files to validate syntax, check for errors, and format your YAML beautifully. Convert between YAML and JSON with one click.

Does FileHoot support TOML validation and editing?

Absolutely! FileHoot is also a TOML editor, TOML validator, and TOML formatter. Edit TOML configuration files, validate syntax, format content, and convert between TOML and other formats like JSON and YAML.

Is my data safe with FileHoot's online editor?

100% safe. FileHoot processes all data locally in your browser. Your JSON, YAML, TOML, or CSV files are never uploaded to any server. No tracking, no cookies, complete privacy. Your data never leaves your device.

What's the difference between JSON linter and JSON validator?

A JSON validator checks if your JSON is syntactically correct. A JSON linter goes further by checking style, formatting, and best practices. FileHoot provides both - it validates JSON syntax and lints for common issues, then offers auto-fix suggestions.

Can FileHoot convert between JSON, YAML, CSV, and TOML?

Yes! FileHoot is a universal data format converter. Convert JSON to YAML, YAML to JSON, CSV to JSON, JSON to CSV, TOML to JSON, JSON to TOML, and more. All conversions happen instantly in your browser.

How does the AI JSON repair feature work?

FileHoot uses WebLLM (browser-based AI) to analyze and automatically fix broken JSON files. It detects missing commas, unclosed brackets, invalid values, and more. The AI runs entirely in your browser using WebGPU, ensuring your data stays private.

Can FileHoot fix broken or invalid JSON?

Yes! FileHoot can automatically fix broken JSON using both rule-based repairs and AI-powered fixes. It can fix missing commas, unclosed strings, unquoted keys, trailing commas, invalid values like undefined/NaN, and many other common JSON errors. Just paste your broken JSON and click 'Repair'.

What JSON errors can FileHoot detect and fix?

FileHoot detects and fixes: missing commas, trailing commas, unclosed brackets and braces, unclosed strings, unquoted keys, single quotes instead of double quotes, invalid values (undefined, NaN, Infinity), comments in JSON, leading zeros in numbers, and many more syntax errors.

Is FileHoot better than JSONLint?

FileHoot offers everything JSONLint does plus more: AI-powered auto-repair, format conversion (JSON/YAML/TOML/CSV), data visualization (tree/table views), an AI assistant, and complete privacy (no uploads). All processing happens in your browser.

🦉 FileHoot - AI-Powered Data Format Converter

Convert JSON, YAML, CSV, and TOML files instantly in your browser.

Features

✅ JSON to YAML, CSV, TOML conversion
✅ YAML to JSON conversion
✅ CSV to JSON conversion
✅ TOML to JSON conversion
✅ AI-powered JSON repair
✅ Data visualization (Tree, Table, Raw views)
✅ Format validation
✅ 100% browser-based (no uploads)
✅ Privacy-focused (no tracking)
✅ AI assistant "Hoot" for data queries

Why FileHoot?

100% Private: Your data never leaves your browser. No uploads, no servers, no tracking.

AI-Powered: Meet Hoot, your owl assistant powered by WebLLM. Ask questions about your data!

Free Forever: No subscriptions, no premium features. Just free, powerful data conversion.

Enable JavaScript

Please enable JavaScript in your browser to use FileHoot's interactive features.

Visit filehoot.ai to get started!

FileHoot

AI-Powered • Validate • Fix • Convert

100% Browser-Based No Server • No API Calls • Your Data Never Leaves

Input

No file

🤖

AI-Powered File Repair Drop broken JSON, YAML, or TOML — AI fixes it automatically!

Checking...

Drop file or click to browse

Even broken files — we'll fix them! ✨

JSON YAML CSV TOML

Or paste content

Format Override

0/0

No data loaded

Drop a file, paste content, or upload to get started

Hoot Ready to help!

Hey! 👋 I'm Hoot, your AI-powered data assistant.

Load some data and ask me anything - I'll analyze, explain, and help you understand it!

Welcome to FileHoot!

Your privacy-first JSON, YAML, CSV & TOML editor with AI-powered assistance.

100% Private

All processing happens in your browser. No data is ever uploaded to any server.

Auto Repair

Fix broken JSON/YAML with rule-based or AI-powered repair.

Format Convert

Convert between JSON, YAML, TOML, and CSV instantly.

Hoot AI Assistant

Ask questions about your data in natural language.

Quick Start

Paste or upload your data

Explore with different views

Chat with Hoot to analyze

Data Views

FileHoot offers multiple ways to visualize your data:

Tree View

▼ data: { 3 items

▶ users: [ 5 items

Collapsible tree structure with expand/collapse controls.

Table View

id	name	email
1	John	john@ex.com
2	Jane	jane@ex.com

Best for array data with sortable columns.

Graph View

Visualize relationships and node connections.

Raw View

2 "name": "John"

Syntax-highlighted code editor.

Repair Broken Data

FileHoot can automatically fix common issues in your JSON/YAML files.

Rule-Based Repair

Instant

Automatically fixes common syntax errors:

Missing/trailing commas
Unquoted keys
Single quotes → double quotes
Unescaped characters

AI-Powered Repair

Smart

Uses AI for complex structural issues:

Malformed structure repair
Intelligent inference
Context-aware fixes
Works when rules fail

Format Conversion

Convert between any supported format with one click:

JSON ⟷ YAML ⟷ TOML ⟷ CSV

JSON

{"name": "John"}

→

YAML

name: John

Use the format dropdown in the toolbar to select your target format.

XPath Queries - Precise Data Analysis

Use XPath to query your data with 100% JavaScript accuracy.

Click XPath button in Tree View

weight: 5.97

XPath Copied to Clipboard

@xpath:root.data.edges[*].weight

Paste & Ask Your Question

how many @xpath:... > 5?

Query Types (100% Accurate)

Counting

how many @xpath:... > 5 how many @xpath:... = true

Statistics

maximum @xpath:... @xpath:... - sum

Listing

list @xpath:... @xpath:... - unique

Hoot AI Assistant

Analyze & Interpret Your Data

Chat with Hoot, our AI agent that runs 100% in your browser. No API calls, no data uploads - your information stays completely private.

100% Browser-Based

AI runs locally using WebLLM technology

No External API Calls

Your data never leaves your device

Works Offline

After initial model download, works without internet

Try XPath Queries

how many @xpath:root.data.users[*].id are unique? maximum @xpath:root.data.edges[*].weight list @xpath:root.data.events[*].status

Report a Bug

Normal:

With Errors:

When errors are detected, the icon turns red. Click it to copy the bug report, then email to:

hello@filehoot.ai

No data loaded

Parse Error