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Developer Tools

JSON Formatter & Validator

Format or validate standard JSON, inspect its structure, and minify it for copying into code or configuration.

JSON Input

Drag & drop JSON file here, or click to upload

Output Result

ValidationVALID ✓
Total Keys6
Nesting Depth2
Root TypeObject

Example input and result

{"name":"Ada","active":true}
{
  "name": "Ada",
  "active": true
}

Why Choose JSON Formatter & Validator

Format or validate standard JSON, inspect its structure, and minify it for copying into code or configuration.

How to Use

  1. 1Paste JSON with quoted keys and string values.
  2. 2Choose Format, Minify or Validate.
  3. 3Read the syntax result and copy the output when it is valid.

Frequently Asked Questions (FAQ)

Why does a trailing comma fail?

JSON does not allow a comma before a closing brace or bracket. Change {"count":1,} to {"count":1}. Comments and single-quoted strings are also outside standard JSON.

Does formatting preserve every number and key?

The tool parses JSON with JavaScript and serializes it again. Duplicate object keys can collapse, and integers above 9,007,199,254,740,991 can lose precision. Keep identifiers and exact large integers as strings.

Does valid JSON guarantee a valid API request?

No. Syntax validation does not validate your API schema, required properties, data types or business rules.

Authoritative References & Sources

RFC 8259 — JSON

View Source

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