Paste or upload JSON
Use raw API output, a configuration file, or any valid JSON object or array. Files are limited to 25 MB in this browser tool.
JSON tools
JSON Formatter and Validator
Free online JSON Formatter and Validator
Formatted JSON
The result will appear here after you run the tool.
Table view is available when the JSON root is an array of objects, or contains a record array.
No errors were found.
Generated JSON Schema
The result will appear here after you run the tool.
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About this tool
About this tool
JSON Formatter and Validator checks JSON syntax and pretty-prints readable output by parsing input in the browser, showing code, tree, table, schema, and statistics views. It runs entirely on your device and handles files up to 25 MB with optional key sorting and minification.
Paste or upload JSON to validate syntax, format or minify it, inspect nested values, search paths, render record arrays as tables, infer a schema, measure structure, and continue into connected JSON tools without uploading your content.
Built for daily work
- Inspect API and webhook responses during development.
- Review configuration files before deployment.
- Find paths inside deeply nested objects and arrays.
- Convert a record array into a readable table before export.
How to use this tool
How to use this tool
Format and inspect
Choose indentation and key order, then switch between code, tree, table, errors, schema, and statistics views.
Copy or download
Copy the full result, copy a selected path or value from the tree, or download the formatted JSON file.
Key features
Key features
Code, tree, table, schema, and statistics views
Switch between formatted code, collapsible tree navigation, record table for array-of-objects, inferred JSON Schema, error list, and size and structure statistics without leaving the page.
Search and path copying
Search keys and values across the document, expand or collapse all nodes, and copy a node's JSONPath or its value for use in code or documentation.
Conservative repair and formatting options
Apply optional repair for comments, trailing commas, single quotes, unquoted keys, and invalid JavaScript values, choose 2 spaces, 4 spaces, or tabs, sort keys alphabetically, and minify when you need compact output.
Local processing with file and workspace support
Parse .json and .txt files up to 25 MB in your browser, keep work in optional local storage drafts, and continue into repair, diff, tree, JSONPath, and schema tools without uploading content.
Practical use cases
Practical use cases
- Inspect API and webhook responses during development.
- Review configuration files before deployment.
- Find paths inside deeply nested objects and arrays.
- Convert a record array into a readable table before export.
- Check AI generated structured output before passing it to an application.
- Measure formatted and minified size before shipping a payload.
Private by default
For local tools, input is processed in your browser and is not sent to application analytics.
Data processing noticeTechnical details
Technical details
ProcessingLocal browser processing
Accepted files.json and .txt
Maximum local file25 MB
Indentation2 spaces, 4 spaces, or tabs
Schema outputJSON Schema draft 2020-12 compatible structure
Saved workspaceOptional browser local storage
Limitations and important notes
Limitations and important notes
- Repair is conservative and cannot infer every intended structure.
- Duplicate keys may already be overwritten by the JavaScript parser after successful parsing.
- Table view is intended for arrays of similar records, not arbitrary nested graphs.
- Schema inference describes the sample and should not replace a reviewed production schema.
Frequently asked questions
Frequently asked questions
No. Formatting, validation, repair, tree rendering, table rendering, and schema generation run in your browser.
The validator accepts strict JSON syntax. It does not treat comments, trailing commas, undefined, NaN, or Infinity as valid JSON.
It can repair common patterns such as comments, trailing commas, single quoted strings, unquoted keys, and invalid JavaScript values. Always review repaired output.
A table needs repeated records. The view activates for an array of objects or for an object property containing an array of objects.
The current upload limit is 25 MB. Very deeply nested or extremely large files may still be limited by your device memory and browser.
Related guides and solutions
Related guides and solutions
What local browser processing means for online tools
A transparent explanation of local tool processing, temporary browser memory, local storage, downloads, analytics boundaries, and cases that require remote services.
Learn moreHow to format and validate JSON correctly
A practical guide to indentation, syntax validation, key order, parser errors, and safe output review.
Learn moreJSON syntax and data type reference
A compact technical reference for writing and validating strict JSON that can be opened in standards-compliant parsers.
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