PerfectJSON

Spec sheet

What it does

PerfectJSON is a free browser-based JSON formatter, validator and editor.Read 7 Oct 2026 · perfectjson.com

Intended users

The maker describes it as built for developers who work with JSON, including people handling API payloads, access tokens and configuration files.Read 7 Oct 2026 · perfectjson.com

Support

The site provides separate email contacts for feedback, bugs and feature requests, and for security and privacy questions.Read 7 Oct 2026 · perfectjson.com

Auto-fix

Its one-click Auto-fix can repair trailing commas, single quotes, unquoted keys, comments and unbalanced brackets.Read 7 Oct 2026 · perfectjson.com

Browser support

It supports current versions of Chrome, Firefox, Safari and Edge on desktop and mobile, with JavaScript enabled.Read 7 Oct 2026 · perfectjson.com

Conversion and export

It converts JSON to YAML, CSV, plain text, formatted JSON or minified JSON, and lets users copy or download results.Read 7 Oct 2026 · perfectjson.com

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.Read 7 Oct 2026 · perfectjson.com

Editing and comparison

It offers tree or table editing, raw text editing with live highlighting, and a side-by-side JSON diff viewer.Read 7 Oct 2026 · perfectjson.com

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.Read 7 Oct 2026 · perfectjson.com

Large numbers

Its lossless parser preserves large numbers and 64-bit IDs above 9007199254740991 through formatting and editing.Read 7 Oct 2026 · perfectjson.com

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.Read 7 Oct 2026 · perfectjson.com

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.Read 7 Oct 2026 · perfectjson.com

Plans and prices

Every PerfectJSON plan and price →

Where Specifiction places it

• JSON Tools#28 of 296.9