Data & JSON
JSON Formatter & Validator
Pretty print, minify, and validate JSON documents with exact syntax error locations, document metrics, and interactive tree view. Runs 100% locally in your browser.
● LOCAL
● NO NETWORK
● RFC 8259
Bytes: 0 B
Chars: 0
Lines: 0
Status: Empty
JSON Tool Cluster:
- Need to compare two JSON documents? Open JSON Diff & Comparison.
- Need to convert between YAML or CSV? Open JSON ↔ YAML ↔ CSV Converter.
- Need TypeScript types from JSON? Open JSON → TypeScript Generator.
- Need to validate against a schema? Open JSON Schema Validator.
About JSON Formatting & Validation
JavaScript Object Notation (JSON) is a lightweight, text-based, language-independent data interchange format defined by RFC 8259 and ECMA-404. Strict JSON requires double-quoted strings, does not allow comments or trailing commas, and distinguishes between objects, arrays, numbers, strings, booleans, and null.
Common Syntax Errors & Solutions
- Trailing Commas:
{"a": 1, "b": 2,}is invalid in strict JSON. The trailing comma after2causes a parse error. - Single Quotes: JSON keys and string values must strictly use double quotes (
"key"), not single quotes ('key'). - Unquoted Keys: JavaScript object literal syntax allows unquoted keys (
{name: "Alice"}), but standard JSON requires{"name": "Alice"}. - Numbers with Leading Zeros: Octal numbers and leading zeros like
0123are forbidden in JSON.
Privacy & Local Execution
All formatting, minification, tree construction, and validation execute directly inside your browser runtime. QuikTech does not transmit your JSON payloads across the network.