JSON Formatter

Format valid JSON into readable, consistently indented output in your browser.

Input
Output
0 characters 0 lines

What does JSON Formatter do?

JSON Formatter formats JSON into readable indentation while preserving the data structure.

  • Primary use: JSON Formatter formats JSON into readable indentation while preserving the data structure.
  • Key technical fact: JSON has 4 primitive types and 2 structured types: objects and arrays.
  • Practical check: Run the formatted or minified output through your parser, tests, or runtime when exact syntax behavior matters.
Topic Direct answer Source
Direct answer JSON Formatter formats JSON into readable indentation while preserving the data structure. IETF RFC 8259
Key fact JSON has 4 primitive types and 2 structured types: objects and arrays. IETF RFC 8259
Processing model Runs locally in the browser; no production Node server receives the input. Browser JavaScript

Format JSON without changing its data

JSON Formatter parses your input and prints it with predictable indentation. It is useful for inspecting API responses, config files, package metadata, logs, and copied payloads that arrive as one long line.

The input must be valid JSON: quoted property names, no trailing commas, no comments, and valid strings. Formatting changes whitespace only; object keys, array order, numbers, booleans, null values, and string content are preserved.

How to use

  1. Paste your JSON data into the input editor.
  2. Click Format JSON to parse and indent it.
  3. Review the formatted output to confirm the structure, nesting, and arrays are what you expect.
  4. Use Copy for the clipboard, Download for a file, or Clear to reset.

What is JSON Formatter?

JSON Formatter is a browser-based utility for turning compact JSON into a human-readable document. It makes nested objects and arrays easier to scan during debugging, reviews, and documentation work.

Because JSON is a strict data format, the formatter also acts as a quick validity check. If the input cannot be parsed, fix the syntax first rather than relying on indentation to repair the payload.

Input notes

Paste only the JSON document, not HTTP headers, variable assignments, Markdown fences, or surrounding quotes from another UI. Whitespace inside quoted strings is data and will be preserved.

Example

A compact payload becomes easier to review once objects and values are placed on separate lines:

--- Minified Input ---
{"name":"John","age":30,"city":"New York"}

--- Formatted Output ---
{
  "name": "John",
  "age": 30,
  "city": "New York"
}

MCP integration

MCP (Model Context Protocol) lets AI agents and apps discover and run Coding.Tools utilities for repeatable conversions, formatting, hashing, and generation workflows.

MCP tool name: json-formatter

MCP endpoint: https://coding.tools/mcp

Call tools/list first. Each tool entry includes inputSchema, outputSchema, and examples so an AI agent or client can build valid arguments without guessing.

For tools/call, read result.content[0].text for the display value and result.structuredContent for machine parsing. Tool-level failures return isError: true; protocol failures return a JSON-RPC error.

Example tools/call request:

curl -s https://coding.tools/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "MCP-Protocol-Version: 2025-06-18" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"json-formatter","arguments":{"input":"{\"name\":\"Coding.Tools\",\"features\":[\"MCP\",\"A2A\"]}","options":{"spaces":2}}}}'

Most text and data tools accept an input string plus optional options. Browser-only image tools are listed for discovery and return a web UI link when they need browser image APIs.