Online JSON Formatter, Validator & Diff Checker
Format, validate, query, and compare your JSON payloads in a secure, high-performance environment. Designed for developers who want a familiar, VS Code-like coding experience directly in their web browser.
⚡ High Performance Formatter
Format nested JSON payloads instantly. Clean formatting helps you read, debug, and inspect API responses quickly.
🔍 JSONPath Querying
Filter and extract values from complex JSON payloads using powerful JSONPath expressions without leaving the tool.
⚖️ Diff Checker & Compare
Compare two JSON objects side-by-side to highlight additions, modifications, and deletions. Spot structural differences in seconds.
🔒 100% Client-Side & Secure
Your data never leaves your browser. All formatting, sorting, and validation occur completely locally in JavaScript.
How to Format and Validate JSON Online
- Paste your raw JSON text directly into the VS Code-style editor.
- If there are any syntax errors, the built-in validator will underline them in red and display details in the blue status bar.
- Click Beautify (or press
Shift + Alt + F) to format the code automatically, or click Minify to condense the payload. - Use the Sort Keys action to sort JSON keys alphabetically for clean structure.
Frequently Asked Questions
- Is this online JSON formatter safe to use?
- Yes. Unlike other tools that send your payloads to external servers, this formatter works 100% client-side. Your data remains safe and private within your local browser context.
- Can I query JSON payloads using JSONPath?
- Yes, enter any valid JSONPath expression (e.g.,
$.store.book[*].author) in the query bar at the top of the editor and press query to extract specific nodes. - How do I compare two JSON objects?
- Click the Compare tab to open the side-by-side Diff Editor. Paste your original JSON on the left and the modified JSON on the right to visually inspect differences.