JSON Formatter & Validator
Paste raw or minified JSON and get it instantly formatted with proper indentation and syntax validation.
- Debug malformed API responses
- Prettify minified config files
- Validate JSON before committing to version control
#json#format#diff#csv#yaml#xml#typescript#jsonpath#convert
What's included in JSON & Data Toolkit
14 tools, all free and client-side — no login or data upload required.
JSON Minifier
Strip all whitespace and comments from JSON to reduce payload size for APIs and config files.
- Reduce REST API response size
- Compress config files for production
- Minimize JSON for localStorage or cookies
JSON Repair
Fix common JSON syntax errors like trailing commas, unquoted keys, and missing brackets automatically.
- Fix JSON copied from logs with trailing commas
- Repair hand-edited config files
- Clean up JSON exported from non-standard tools
CSV to JSON
Upload or paste CSV data and convert it to a JSON array with auto-detected headers.
- Import spreadsheet data into a web app
- Convert Excel exports for API consumption
- Transform CSV reports into JSON for processing
JSON to CSV
Export a flat JSON array to comma-separated CSV format, ready to open in Excel or Google Sheets.
- Export API data to spreadsheets
- Convert database JSON exports to CSV reports
- Share JSON data with non-technical team members
JSON to YAML
Convert JSON objects to YAML format for Kubernetes configs, CI/CD pipelines, and human-readable configs.
- Create Kubernetes manifests from JSON
- Write GitHub Actions workflows from JSON config
- Convert OpenAPI JSON spec to YAML
YAML to JSON
Parse YAML documents and convert them back to JSON for APIs, tooling, and programmatic use.
- Convert Kubernetes YAML back to JSON for tooling
- Parse GitHub Actions config into JSON
- Migrate YAML settings to JSON-based systems
JSON to XML
Transform JSON data into valid XML markup — useful for SOAP APIs, legacy systems, and data exchange.
- Integrate with SOAP or XML-based APIs
- Convert data for legacy enterprise systems
- Generate XML feeds from JSON data sources
XML to JSON
Convert XML documents to JSON so you can work with them in modern JavaScript and REST APIs.
- Parse XML API responses into JSON
- Migrate legacy XML configs to modern JSON
- Convert RSS/Atom feeds to JSON for web apps
JSON to TypeScript
Generate TypeScript interfaces and type definitions automatically from any JSON object or array.
- Scaffold TypeScript types from API responses
- Speed up type-safe frontend development
- Document data structures without writing boilerplate
JSON to Markdown Table
Turn a JSON array of objects into a formatted Markdown table for documentation and README files.
- Add data tables to GitHub README files
- Document API response structures in Markdown
- Generate comparison tables for technical docs
JSON Diff
Paste two JSON documents side by side and instantly see every addition, deletion, and change highlighted.
- Compare API responses before and after a change
- Audit config file differences
- Review data migrations for correctness
JSONPath Query
Run JSONPath expressions (like $.store.book[*].author) against any JSON to extract nested values.
- Extract specific fields from deeply nested API responses
- Filter arrays within JSON by condition
- Prototype JSONPath queries before using in code
CSV Table Viewer
Parse CSV files and render them as a sortable, searchable HTML table with column filtering.
- Preview CSV exports before importing
- Explore large CSV datasets in the browser
- Search and filter tabular data without Excel
About JSON & Data Toolkit
The JSON & Data Toolkit is a free, browser-based suite of tools for working with JSON and related data formats. Paste raw JSON to format it with consistent indentation, minify it to reduce payload size, or repair common syntax errors like trailing commas and unquoted keys. Every tool runs entirely on your device — no JSON is ever sent to a server, logged, or stored.
Beyond formatting, the toolkit includes bidirectional converters for CSV, YAML, XML, TypeScript interfaces, and Markdown tables, so you can move data between REST APIs, Kubernetes manifests, spreadsheets, and documentation in seconds. The JSON Diff tool highlights every added, removed, or changed key between two documents, and JSONPath Query lets you test expressions like $.store.book[*].author against any payload before using them in production code.
All tools are tuned for large files. Parsing, validation, and transformation happen in your browser using native APIs, so there are no file-size limits beyond what your device can handle, and nothing leaves your machine. This makes the toolkit safe to use with confidential API responses, production data dumps, and internal schemas that would normally require an air-gapped environment.
How to use JSON & Data Toolkit
- 1
Choose the right tab
Pick a sub-tool from the tab bar: Format for pretty-printing, Diff for comparing, or one of the converters for CSV / YAML / XML / TypeScript / Markdown output.
- 2
Paste or upload your data
Drop JSON directly into the input pane, or upload a .json file. The tool validates the input and reports any syntax errors with line and column numbers.
- 3
Configure options if needed
Adjust indentation width, sort keys, or toggle trailing newlines where the tool exposes these. Most options update the output live as you type.
- 4
Copy, download, or share
Use the copy button to send output to the clipboard, download the result as a file, or share the link to this tool with a teammate — the page itself carries no state.