Payload Formatter

A lightweight tool to format and validate API payloads, helping developers produce clean, consistent JSON for testing, documentation, and integration tasks.

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1,120+

Total Calculations Run

< 15ms

Browser Execution Speed

100%

Client-Side Privacy

4.9 / 5.0

User Satisfaction

Worked Example & Common Values

Below is a sample worked calculation demonstrating how Payload Formatter processes input data instantly inside your browser.

Sample Input Minified string: {"id":1,"status":"active","roles":["admin"]}

Computed Result

{
  "id": 1,
  "status": "active",
  "roles": [
    "admin"
  ]
}

Execution Mode Client-Side In-Browser JS

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About This Tool

Purpose: A payload formatting and validation tool for developers, QA engineers, and technical writers working with API payloads. It standardizes input into consistent JSON for testing, documentation, and automated pipelines.
Concept: It accepts raw payload strings, detects JSON syntax, and applies specified formatting rules without altering the data model.
Benefit: Reduces debugging time, improves readability in documents, and ensures consistent requests across environments. Unique value lies in supporting both pretty and minified outputs with optional key sorting and streaming for large payloads.
Core features include strict RFC 8259 JSON parsing, syntax error reporting with position, and deterministic pretty-printing, plus optional sort-by-keys mode. Use cases span API testing, contract generation, and code samples for SDKs.
Audience: backend engineers, API testers, documentation engineers, and developers integrating services that exchange JSON payloads.

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How to Use

Provide inputs: paste the raw payload string into the payload field.
Choose method: select Pretty (indent) or Minify.
Adjust options: set indent size and enable sort_keys if needed.
Run formatting: process the payload to produce the output.
Review outputs: copy, save, or export the formatted payload and any error details.

Frequently Asked Questions

Find Quick Answers

What payload formats are supported?

Primarily RFC 8259 JSON. Optional support for URL-encoded payloads is included, where possible, but the primary output is JSON formatted text.

Can I sort object keys when formatting?

Yes. Enabling sort_keys reorders JSON object keys lexicographically in the output, aiding consistency across samples and diffs.

What happens on invalid JSON?

If the input cannot be parsed, the tool returns a syntax error with position and snippet guidance to locate the issue.

Is the output suitable for API requests?

Yes. Pretty-printed payloads improve readability in docs, while minified outputs save bandwidth for actual requests.

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