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Right-click any field for insert/duplicate/delete options
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Frequently Asked Questions
Is my data safe when using this JSON Validator?
Yes. The JSON Validator runs entirely in your browser using JavaScript. Your JSON payloads are never transmitted to our servers or any third party, making it secure for validating sensitive enterprise configurations or API responses.
Does this tool comply with RFC 8259 standards?
Yes. The validator checks your JSON strictly against RFC 8259 — the official specification for JSON interchange format. It catches syntax errors such as trailing commas, unquoted keys, missing brackets, and invalid escape sequences.
Can I validate and format minified JSON?
Absolutely. Paste any minified single-line JSON string and the formatter will indent and beautify it for readability while simultaneously checking its structural validity. You can also compare two JSON documents side-by-side using the Diff tab.
JSON Validation
JSON validation uses the browser's native JSON.parse() method, which strictly follows RFC 8259. Common errors include: missing or extra commas, unquoted keys, single quotes instead of double quotes, trailing commas, and unescaped special characters in strings.
Pretty Print vs Minify
Pretty printing adds consistent indentation (2 or 4 spaces) and newlines to make JSON human-readable. Minification removes all whitespace to reduce file size — useful before transmitting JSON over a network or embedding in production code. Neither changes the data; only the whitespace format differs.
JSONPath Queries
JSONPath lets you extract values using dot notation (e.g., $.user.name) or bracket notation (e.g., $["items"][0]["id"]). The $ represents the root object. Use [*] to iterate all items in an array.
Common JSON Issues
JSON does not support comments, trailing commas, or undefined values. Numbers cannot have leading zeros. All strings must be double-quoted. Valid types are: string, number, boolean, null, array, and object.
Save snippets, custom schema presets & validation history — coming soon for logged-in users