A collection of free, fast, browser-based JSON tools for developers, testers, and data engineers.
All tools work locally in your browser — your data never leaves your machine.
🌐 Official Website: https://jsonviewertool.com
- Available Tools
- Example Usage
- Privacy & Security
- Who Is This For?
- Why JSONViewerTool?
- Feedback & Suggestions
- JSON Viewer — view JSON in a collapsible tree
https://jsonviewertool.com/json-viewer - JSON Formatter — prettify / beautify JSON instantly
https://jsonviewertool.com/json-formatter - JSON Validator — validate JSON & locate syntax errors
https://jsonviewertool.com/json-validator - JSON Minifier — compress JSON for production
https://jsonviewertool.com/json-minifier - JSON Compare — diff two JSON payloads
https://jsonviewertool.com/json-compare
- YAML → JSON — debug Kubernetes & CI configs quickly
https://jsonviewertool.com/yaml-to-json - JSON → YAML — convert JSON configs to YAML
https://jsonviewertool.com/json-to-yaml - JSON → CSV — export API responses to CSV for Excel/Sheets
https://jsonviewertool.com/json-to-csv - CSV → JSON — convert spreadsheets into structured JSON
https://jsonviewertool.com/csv-to-json - JSON → XML — integrate with legacy systems
https://jsonviewertool.com/json-to-xml - XML → JSON — convert XML/SOAP responses to modern JSON
https://jsonviewertool.com/xml-to-json - JSON → Excel — one-click
.xlsxexport
https://jsonviewertool.com/json-to-excel
- JSON Merge — merge multiple JSON objects
https://jsonviewertool.com/json-merge - JSON Flatten / Unflatten — handle deeply nested JSON
https://jsonviewertool.com/json-flatten - JSONPath / JMESPath — query JSON like SQL
https://jsonviewertool.com/json-path - JSON Schema Validator — validate JSON using schema rules
https://jsonviewertool.com/json-schema-validator - JSON Sample Generator — generate mock JSON data
https://jsonviewertool.com/json-sample-generator - JSON Size Analyzer — measure payload size for APIs
https://jsonviewertool.com/json-size-analyzer
- JWT Decoder — decode JWT header/payload/signature
https://jsonviewertool.com/jwt-decoder - Base64 Encoder — encode text/files to Base64
https://jsonviewertool.com/base64-encoder - Base64 Decoder — decode Base64 data
https://jsonviewertool.com/base64-decoder - UUID Generator — generate RFC-compliant UUIDs
https://jsonviewertool.com/uuid-generator
- JSON Escape / Unescape — escape strings safely
https://jsonviewertool.com/json-escape - Compare Clips (Text Diff) — compare any text quickly
https://jsonviewertool.com/compare-clips
➡️ Explore all tools: https://jsonviewertool.com/
📊 Dataset DOI (Zenodo): https://zenodo.org/records/18301630
🏛 Harvard Dataverse: https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/ZE8W9H
🎓 ICPSR: (add once approved)
Used for:
- API testing
- JSON validation
- Parser benchmarking
- 🐍 CLI (Python / PyPI): https://pypi.org/project/jsonviewertool-cli/
- ☕ Java Utilities SDK: https://github.com/coderaviverma/jsonviewertool-utils
- No server-side processing of your JSON
- No file uploads
- Everything runs locally in your browser
Validate JSON
- Paste JSON into the editor
- Click validate
- Fix errors instantly
Convert JSON to CSV
- Paste JSON data
- Convert to CSV
- Copy or download for Excel
- No file uploads
- No server-side processing
- No tracking of JSON data
- Everything runs locally in your browser
- Software Developers
- Backend & Frontend Engineers
- QA / Automation Engineers
- Data Analysts
- Students learning JSON & APIs
- Fast & lightweight
- Clean and distraction-free UI
- No login required
- Completely free to use
- Works on desktop & mobile
Have an idea for a new tool or improvement?
Open an issue or reach out via the website.
🔗 Website: https://jsonviewertool.com
Also Featured on Flipboard: https://flipboard.com/@jsonviewertool/jsonviewertool-k7ccm91fz/json-viewer-tool-free-online-json-viewer-formatter-editor/a-DxywQH1nTZitulB4hJDQwQ%3Aa%3A4165248032-e36330d7b8%2Fjsonviewertool.com