What's the difference from JSON Formatter?

JSON Validator focuses on error detection and shows line/column numbers for issues. JSON Formatter focuses on beautifying valid JSON.

Does JSON Validator log or store the data I paste into it?

No. JSON Validator processes everything locally in your browser. Nothing is sent to a server, logged, or stored. Your code, secrets, and data never leave your machine.

Which browsers are compatible with JSON Validator?

JSON Validator works in all modern evergreen browsers: Chrome 90+, Firefox 88+, Edge 90+, and Safari 14+. Internet Explorer is not supported.

How does JSON Validator work?

JSON Validator analyses the content, URL, or data you provide and returns a detailed report with actionable findings. All analysis runs in your browser — no server upload required.

Is JSON Validator free to use?

Yes, JSON Validator is 100% free with no usage limits, no watermarks, and no hidden charges. The platform is supported by non-intrusive advertising so all tools stay free for everyone.

Do I need to create an account to use JSON Validator?

No account or registration is required. Open JSON Validator and start immediately — no email, no sign-up, no personal information needed.

Is my data safe when using JSON Validator?

Yes. JSON Validator runs entirely in your browser using client-side JavaScript. Your files and data never leave your device and are never transmitted to our servers.

Does JSON Validator work on mobile and tablet devices?

Yes. JSON Validator is fully responsive and tested on smartphones, tablets, and all major desktop browsers (Chrome, Firefox, Safari, and Edge). The interface adapts automatically to any screen size.

JSON Validator

NEW

Validate and lint any JSON instantly

FreeNo sign-upDeveloper Tools →

JSON Validator is a free, browser-based web development and coding tool. Paste JSON and instantly validate it. See detailed error messages with line numbers. Also formats and minifies JSON.

Web developers, software engineers, and DevOps professionals use JSON Validator every day to save time and skip the overhead of desktop software or paid services. No installation, no account, and no technical knowledge required — just upload JSON Validator and get results in seconds. Your files never leave your browser — full privacy by design.

JSON Validator

JSON input

Formatted output

Indent:

How to use JSON Validator

Paste JSON

Enter your JSON string.

Validate

See if it's valid with error details.

Format or minify

Clean up or compact the JSON.

Use Cases

Debugging and validating data formats during API development
Preparing test fixtures and sample payloads
Encoding and decoding data for integrations and authentication flows
Formatting and linting configuration files before deployment

Key Benefits

100% free with no usage limits, watermarks, or hidden fees
No account or sign-up required — use it instantly
Works in all modern browsers on desktop, tablet, and mobile
Privacy-first: all processing runs locally, files never leave your device
Fast local processing — no server upload queues
Batch process multiple files in one operation
Original file is never modified — output is always a new file

JSON Validator

How to use JSON Validator

Paste JSON

Validate

Format or minify

Use Cases

Key Benefits

Frequently Asked Questions

JSON Formatter

JSON Diff Tool

JSON Escape / Unescape