Browser-local developer utilities

JSON tools for real API payloads

Compare, format, validate, query, decode, and convert structured data in your browser. Core tool input is processed locally and is not sent to analytics.

Verify local processing Check whether a JSON tool uploads data

Inspect and compare JSON

Find structural changes and navigate nested API responses, webhook events, and configuration snapshots.

Compare JSONHighlight added, removed, and changed values across two JSON payloads.JSON ViewerExplore nested objects and arrays in a collapsible JSON tree.JSON ParserInspect JSON fields, paths, values, and data types.

Format and validate data

Turn minified or malformed input into readable output and identify syntax or schema errors.

JSON FormatterFormat JSON with readable indentation, syntax highlighting, and parse errors.JSON BeautifierBeautify minified JSON in a browser-local workflow.JSON ValidatorCheck JSON syntax and locate malformed input.JSON Schema ValidatorValidate API payloads and examples against a JSON Schema.

Query, decode, and convert

Extract nested values, inspect authentication claims, and move structured data between common formats.

JSONPath QueryRun JSONPath expressions against nested JSON data.JWT DecoderDecode JWT headers and claims locally without verifying the signature.JSON to CSVConvert JSON arrays into downloadable CSV data.CSV to JSONConvert CSV rows into structured JSON output.

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Debug an API response

Start with Compare JSON, then use JSONPath to isolate nested fields or Schema Validator to check the response contract.

Inspect sensitive JSON

Use Formatter, Viewer, or Parser and confirm the processing boundary through the browser Network panel.

Fix malformed input

Use JSON Validator for syntax errors, then format the corrected payload into readable output.