Format & minify
Beautify with indentation or compress to a single line. Customizable indent size for reading or production.
Detect syntax errors and pinpoint line/column numbers to fix formatting issues quickly.
From formatting and validation to conversion and export — 10 essential tools in one page. No install, no sign-up, ready to use.
Beautify with indentation or compress to a single line. Customizable indent size for reading or production.
Detect JSON syntax errors with precise line/column numbers. Catch trailing commas, quote issues, and more.
Side-by-side comparison of two JSON documents with highlighted additions, deletions, and changes.
Browse complex JSON in a collapsible tree. Copy paths to quickly locate nested fields.
JSON ↔ YAML, JSON → XML, JSON → CSV / Excel — for config authoring and data export.
Debug JSONPath expressions online. Extract nested fields with one-click templates.
Built for anyone who works with JSON daily — debugging, configuration, testing, and data export.
Everything runs locally in your browser. Paste JSON and see results instantly — nothing is uploaded.
Pick the feature you need from the top navigation — format, validate, diff, convert, and more.
Paste JSON into the input area, or click Load sample to try each feature instantly.
Results appear in real time on the right. Copy or download — all processing stays local.
The JSON validator checks whether your text is valid JSON and pinpoints syntax errors with exact line and column numbers. Catch trailing commas, missing quotes, and bracket mismatches before they break your API or config pipeline.
{"name": "test", "values": [1, 2, 3]}{"name": "test", "values": [1, 2, 3],}A JSON validator (syntax checker) verifies that text conforms to the JSON specification and reports the exact location of any syntax errors.
Paste your JSON into the validator input. It parses the text and immediately shows whether it is valid or lists the error position.
Trailing commas, single quotes instead of double quotes, unquoted keys, and mismatched brackets are the most frequent issues.
Yes. It functions as an online JSON linter, focusing on syntax correctness rather than schema validation.
Yes. JSON Toolbox is completely free with no sign-up, no usage limits, and no hidden fees.
Your data never leaves your browser. All parsing, formatting, and conversion runs locally on your device — nothing is sent to any server.
All modern browsers including Chrome, Firefox, Safari, and Edge. No plugins or extensions required.
Files over 2 MB may feel slow; files over 10 MB are blocked. For very large payloads, use a local CLI tool instead.
Only standard JSON (RFC 8259) is supported. JSON5 features like comments and trailing commas are not accepted.