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JSON Formatter — Format, Minify, Validate

Format or minify JSON. Get validation errors, key count, and depth. Copy to clipboard.

Concept Fundamentals
Indent
2 spaces
Standard
RFC 8259
Encoding
UTF-8
JSON rule
No comments
Format JSONUse the calculator below to compute tech metrics

Why This Technology Metric Matters

Why: Valid JSON is required for APIs and config. Formatting improves readability; minifying reduces size.

How: JSON.parse() validates. Formatted = 2-space indent; minified = no indent. Key count and depth computed recursively.

  • ●Double quotes only
  • ●No trailing commas
  • ●JSON5 allows comments
Sources:JSON.orgMDN JSON

Sample Scenarios — Click to Load

Inputs

output.jsonVALID
{
  "name": "John",
  "age": 30
}
Key count: 2 | Depth: 1
Share:

Format Summary

Input

Input length24 chars
Modeformatted

Output

Key count2
Max depth1
Output length33 chars

For educational and informational purposes only. Verify with a qualified professional.

🔧 Tech Milestones

📋

JSON = subset of JS object literal

— ECMA

⚠️

No trailing commas in JSON

— RFC

Valid JSON uses double quotes for keys and strings. No trailing commas. Formatted = 2-space indent; minified = no whitespace. Key count and depth are computed recursively.

Frequently Asked Questions

What is the difference between JSON and JavaScript object?

JSON is a data format; keys must be double-quoted strings. JavaScript objects can use unquoted keys and single quotes. JSON does not support functions, undefined, or trailing commas.

What does minify mean?

Minifying removes all unnecessary whitespace and newlines to reduce file size. Useful for API responses and config files where size matters.

Why does my JSON fail validation?

Common causes: single quotes instead of double, trailing commas, unquoted keys, or invalid escape sequences. Use this tool to see the exact error message.

What is JSON depth?

Depth is the maximum nesting level of objects/arrays. {"a":{"b":1}} has depth 2. Deep structures can cause stack overflow in some parsers.

Can JSON have comments?

No. Standard JSON does not support comments. Use JSON5 or strip comments before parsing.

How do I handle large JSON?

For very large files, consider streaming parsers. This tool parses in memory.

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