Free tool

JSON Validator & Diff

Paste JSON to validate, pretty-print, minify, or compare two documents side by side. Runs entirely in your browser—handy for checking Schema.org JSON-LD before you publish.

Generate markup with Local Schema or Review Schema, then validate here.

Broken JSON-LD ships because nobody diffed the last edit

A missing comma kills the whole script block. Teams need validate, pretty-print, minify, and side-by-side diff—especially for Schema.org JSON-LD—without uploading client data.

Who it's for

Developers & SEOs

Validate and format JSON-LD before it hits production.

Agencies reviewing vendor markup

Diff two schema versions to see what changed.

Anyone pasting Local Schema output

Confirm the generator output is still valid after manual edits.

Use cases

Pre-publish validation

Paste JSON-LD, fix syntax errors, then deploy.

Pretty-print vs minify

Format for reading or minify for compact embeds.

Side-by-side diff

Compare staging vs production schema and spot field drift.

How it works

1

Paste JSON

Drop one document—or two when you want a diff.

2

Validate and format

Check for errors, pretty-print, or minify as needed.

3

Review JSON-LD hints

Use detection helpers when working with Schema.org payloads.

What you get

  • Validate JSON entirely in the browser
  • Pretty-print and minify
  • Side-by-side diff for two documents
  • JSON-LD / Schema.org awareness
  • No upload and no signup

FAQ

Is my JSON uploaded to a server?

Processing is designed to run in your browser session. Do not paste secrets you would not put in a local editor.

Valid JSON means Google will show rich results?

Syntax validity is required but not sufficient. Content must follow Google’s structured data policies and match visible page content.

What should I validate next?

After JSON is valid, test with Google’s rich results tools and keep NAP aligned with your Google Business Profile.

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Install GMB Audit Tool to pull Place ID, CID, categories, reviews, and competitor scans without copy-paste.

Add to Chrome — free