JSON Formatting and Validation Guide: From Basics to Debugging
JSON(Updated Apr 26, 2026)
What is JSON and Why Formatting Matters?
JSON (JavaScript Object Notation) is the standard data exchange format, used in APIs, config files, databases, and microservices.
Raw JSON is often compressed to one line, making it hard to read. Formatting transforms it into readable, indented output.
Using ToolsKu to Format JSON
- Open JSON Formatter
- Paste or type JSON text
- Auto-format with error detection
- Adjust indentation, sort keys, toggle minify/beautify
Common JSON Errors
| Error | Example | Fix |
|---|---|---|
| Trailing comma | {"a": 1,} |
Remove last comma |
| Single quotes | {'a': 'b'} |
Use double quotes |
| Comments | {// comment} |
Remove comments |
| Unescaped chars | "line1\nline2" |
Use \\n for newlines |
| Unquoted keys | {name: "test"} |
Quote keys: "name" |
JSON Format Conversion
- JSON ↔ YAML — YAML is more human-readable
- JSON ↔ TOML — Common in Rust ecosystem
- JSON ↔ CSV — Convert API data to spreadsheets
Advanced Operations
- JSONPath Query — Extract specific data from complex JSON
- JSON Diff — Compare two JSON files visually
- JSON to TypeScript / Go — Generate type definitions
Summary
ToolsKu provides a complete JSON toolkit: Format, YAML, TOML, CSV, JSONPath, Diff, Type Generation — all browser-based and free.
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