Top JSON Formatting & Validation Tools (Fast + Developer-Friendly)

Leader posted 1 min read

Here are some fast, reliable tools for JSON formatting and validation — perfect for developers working with APIs, logs, or large JSON payloads.


1. jsonformatter.org

  • ✅ Format, validate, minify, and view JSON
  • Has tree view and raw text view
  • Supports upload + clipboard copy
  • Also supports XML, YAML, JWT, CSV

Fastest and most comprehensive online tool.


⚡ 2. jsoneditoronline.org

  • Visual + code editor side-by-side
  • Detects and highlights syntax issues live
  • Offers "Transform", "Sort", and "Filter" tools
  • Supports collaboration with shareable links

Great for working with deeply nested JSON visually.


3. VS Code (Built-in or Plugin)

  • ✨ Use built-in formatting: Right click → Format Document
  • Extensions:
  • Prettier (formatting)
  • JSON Tools (validation, sorting, filtering)
  • Works offline and with huge files

Ideal if you're already coding in VS Code.


4. quicktype.io

  • ⚙️ Convert JSON → TypeScript, Python, Java, etc.
  • Also formats + validates input
  • Instant TypeScript interfaces for Angular/NestJS devs

Best for generating types/interfaces from real API responses.


5. CLI Tools (For local work)

If you want a fast terminal-based option:

jq (lightweight and powerful)
jq '.' data.json  # Format
jq type data.json # Validate

Install:

brew install jq   # macOS
sudo apt install jq   # Ubuntu/Debian

Fastest tool for shell scripting and JSON pipelines.


Summary Table

Tool Format Validate Extras
jsonformatter.org Tree view, minify, export
jsoneditoronline.org Visual editing, sharing
VS Code Extensions, huge JSON
quicktype.io Generate TS/Java classes
jq (CLI) Scriptable, blazing fast

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