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PerfectJSON

PerfectJSON is a free browser-based tool for formatting, validating, editing, comparing, and converting JSON.

Place
#27 of 29
Score
5.9
PerfectJSON's website

What PerfectJSON is

PerfectJSON is a free browser-based tool for formatting, validating, editing, comparing, and converting JSON. It can format or minify a document and validate it against RFC 8259, RFC 7159, RFC 4627, and ECMA-404, identifying errors by line and column. Its one-click Auto-fix can address trailing commas, single quotes, unquoted keys, comments, and unbalanced brackets. Editing options include tree and table views, raw text editing with live highlighting, and a side-by-side diff viewer. PerfectJSON can convert JSON to YAML, CSV, plain text, or formatted or minified JSON, with results available to copy or download. Its lossless parser preserves large numbers and 64-bit IDs above 9007199254740991 through formatting and editing. Parsing, validation, formatting, comparison, and conversion happen locally in the browser; edited JSON is not uploaded, and documents and preferences are stored in browser local storage. No account is required. The site supports current Chrome, Firefox, Safari, and Edge on desktop and mobile with JavaScript enabled, and displays ads.

Good

  • Free plan with no account required
  • Validates against four listed JSON standards
  • Auto-fix handles several common syntax issues
  • Lossless parser preserves large numbers and IDs
  • Edited JSON stays in the browser

Watch out

  • Requires JavaScript to be enabled
  • No JSONPath or jq querying
  • No batch processing
  • Supported by display ads

Who it suits

It suits developers working with JSON such as API payloads, access tokens, and configuration files. It may also help anyone needing browser-based validation, editing, conversion, or comparison.

Verdict

PerfectJSON brings common JSON editing, validation, comparison, and conversion tools into a browser interface. Its local processing and lossless handling of large values are useful considerations, while the service is provided as is without warranties.

Plans and prices

From PerfectJSON's own pricing page, checked 7 Oct 2026.

All about pricing
PlanPriceWhat it gives you
FreeFreeNo accounts · No usage limits · Supported by display ads · Free of charge

The facts

Each one read from PerfectJSON's own pages, with the date it was checked.

What it does

Auto-fix
Its one-click Auto-fix can repair trailing commas, single quotes, unquoted keys, comments and unbalanced brackets.checked 7 Oct 2026
Conversion and export
It converts JSON to YAML, CSV, plain text, formatted JSON or minified JSON, and lets users copy or download results.checked 7 Oct 2026
Data handling
Parsing, validation, formatting, diffing and conversion run locally in the browser; edited JSON is not uploaded, and documents and preferences are stored in browser local storage.checked 7 Oct 2026
Editing and comparison
It offers tree or table editing, raw text editing with live highlighting, and a side-by-side JSON diff viewer.checked 7 Oct 2026
Formatting and validation
It formats or minifies JSON and validates against RFC 8259, RFC 7159, RFC 4627 and ECMA-404 with line- and column-specific errors.checked 7 Oct 2026
Intended users
The maker describes it as built for developers who work with JSON, including people handling API payloads, access tokens and configuration files.checked 7 Oct 2026
Large numbers
Its lossless parser preserves large numbers and 64-bit IDs above 9007199254740991 through formatting and editing.checked 7 Oct 2026
Privacy and ads
The site says it uses Google Analytics and Google AdSense, but neither receives the contents of edited JSON; it also says it does not sell personal information or require an account.checked 7 Oct 2026
Service terms
The tool is provided free of charge as is, without warranties, and the maker says it does not guarantee uninterrupted or error-free operation.checked 7 Oct 2026
Support
The site provides separate email contacts for feedback, bugs and feature requests, and for security and privacy questions.checked 7 Oct 2026
What it does
PerfectJSON is a free browser-based JSON formatter, validator and editor.checked 7 Oct 2026

Where it runs

Browser support
It supports current versions of Chrome, Firefox, Safari and Edge on desktop and mobile, with JavaScript enabled.checked 7 Oct 2026

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