Every JSON tool you need, in one place.

Free, private, browser-based tools to convert, format, merge, validate and transform JSON. Everything runs on your device — nothing is uploaded, and there is no file-size limit.

31 tools · No signup · No uploads · No size cap

Format & inspect

Merge JSON Combine multiple JSON files into one JSON Formatter Beautify & pretty-print JSON JSON Validator Validate with exact error location JSON Minifier Compress JSON to a single line JSON Sort Sort JSON keys A to Z or Z to A JSON Viewer Explore JSON as a collapsible tree JSON Diff Compare two JSON documents JSON Repair Fix broken or LLM JSON JSON Flatten Flatten nested JSON into path keys JSON Unflatten Rebuild nested JSON from flat keys

Convert from JSON

JSON to CSV Convert JSON arrays to CSV JSON to Excel Export JSON to an .xlsx workbook JSON to JSONL Convert arrays to newline-delimited JSON JSON to Table View JSON as a sortable table JSON to HTML Table Generate copy-ready HTML table markup JSON to Markdown Table Generate GitHub-ready Markdown tables JSON to XML Convert JSON to XML markup JSON to YAML Convert JSON to YAML JSON to SQL Generate SQL inserts from JSON

Convert to JSON

CSV to JSON Convert CSV or TSV to JSON Excel to JSON Convert .xlsx spreadsheets to JSON JSONL to JSON Convert JSON Lines or NDJSON to JSON XML to JSON Convert XML to JSON YAML to JSON Convert YAML to JSON

Generate & encode

JSON Generator Generate mock JSON data from templates JSON to TypeScript Generate TS interfaces from JSON JSON Schema Generator Generate a JSON Schema JSON to Base64 Encode and decode Base64 JSON JSON Stringify Stringify and parse escaped JSON JSON Escape Escape text for a JSON string JSON Unescape Decode an escaped JSON string

Free online JSON tools — private and in your browser

MergeJSONFiles is a suite of 31 free online JSON tools for developers. Convert JSON to and from CSV, Excel, YAML, XML and SQL; format, validate, diff and repair JSON; or merge multiple JSON files into one — all from a single, fast toolkit.

Every tool is 100% client-side: your data is parsed and converted locally in the browser, so nothing is ever uploaded to a server. There is no signup, no software to install, and — unlike most rivals — no 10 MB file-size cap. Pick a tool above to get started.