Large JSON File Viewer
Inspect large JSON files locally, view useful structure statistics and keep sensitive data on your device.
100% local · files never leave your browser
Private browser developer tools
Free JSON tools for everyday data work
Format, validate, compare, query and convert JSON without creating an account or intentionally uploading your files to an application server.
✓ 20 focused tools✓ Individual task pages✓ Browser-local processing
View JSON
View tools
Open the exact utility you need. Each page has its own focused workbench, examples, limitations and common questions.
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JSONL & NDJSON Viewer
Parse newline-delimited JSON into readable records with precise line-level error reporting.
JSON Tree Viewer & Editor
Format and inspect JSON before opening it in the visual tree on the main workbench.
Format JSON
Format tools
Open the exact utility you need. Each page has its own focused workbench, examples, limitations and common questions.
JSON Formatter & Minifier
Beautify compact JSON for readability or minify it for smaller payloads.
Fix Broken JSON
Repair common problems such as missing quotes, trailing commas and incomplete structures.
JSON Escape & Unescape
Escape JSON for strings and logs, or decode an already escaped JSON string.
Inspect JSON
Inspect tools
Open the exact utility you need. Each page has its own focused workbench, examples, limitations and common questions.
JSON Syntax Validator
Validate JSON syntax and get a clear error message when parsing fails.
JSON Compare & Diff
Compare two JSON documents by path and find added, removed and changed values.
JSONPath Tester
Query deeply nested JSON with JSONPath and inspect every matching value.
JSON Schema Validator
Validate JSON data against a JSON Schema using the widely adopted AJV validator.
JWT Decoder
Decode JWT headers and payloads locally. Signature verification is intentionally not implied.
Generate JSON
Generate tools
Open the exact utility you need. Each page has its own focused workbench, examples, limitations and common questions.
JSON Schema Generator
Infer a practical JSON Schema from a representative example document.
JSON to TypeScript
Generate readable TypeScript interfaces from representative JSON data.
JSON to Go Struct
Generate idiomatic Go structs with JSON tags from sample payloads.
JSON to Java Classes
Generate Java records from JSON with nested object and list types.
Convert JSON
Convert tools
Open the exact utility you need. Each page has its own focused workbench, examples, limitations and common questions.
JSON to CSV Converter
Turn arrays of JSON objects into spreadsheet-ready CSV in your browser.
CSV to JSON Converter
Convert CSV rows to structured JSON while preserving quoted commas and headers.
JSON to YAML Converter
Convert JSON to clean, readable YAML for configuration and documentation.
YAML to JSON Converter
Parse YAML safely in the browser and return consistently formatted JSON.
Flatten or Unflatten JSON
Flatten nested values into dot paths, or rebuild nested JSON from dot-path keys.