The toolkit
All JSON tools, in one place.
A complete set of free, private JSON utilities — formatting, validation, key sorting, stringifying, mock data generation, flattening, unflattening, and conversion to CSV, Excel, JSONL, Base64, HTML tables, Markdown tables, and back. Every tool runs entirely in your browser, with no uploads and no file-size cap.
Format & inspect
Merge JSON
Combine multiple JSON files into one
Open →JSON Formatter
Beautify & pretty-print JSON
Open →JSON Validator
Validate with exact error location
Open →JSON Minifier
Compress JSON to a single line
Open →JSON Sort
Sort JSON keys A to Z or Z to A
Open →JSON Viewer
Explore JSON as a collapsible tree
Open →JSON Diff
Compare two JSON documents
Open →JSON Repair
Fix broken or LLM JSON
Open →JSON Flatten
Flatten nested JSON into path keys
Open →JSON Unflatten
Rebuild nested JSON from flat keys
Open →Convert from JSON
JSON to CSV
Convert JSON arrays to CSV
Open →JSON to Excel
Export JSON to an .xlsx workbook
Open →JSON to JSONL
Convert arrays to newline-delimited JSON
Open →JSON to Table
View JSON as a sortable table
Open →JSON to HTML Table
Generate copy-ready HTML table markup
Open →JSON to Markdown Table
Generate GitHub-ready Markdown tables
Open →JSON to XML
Convert JSON to XML markup
Open →JSON to YAML
Convert JSON to YAML
Open →JSON to SQL
Generate SQL inserts from JSON
Open →Convert to JSON
Generate & encode
JSON Generator
Generate mock JSON data from templates
Open →JSON to TypeScript
Generate TS interfaces from JSON
Open →JSON Schema Generator
Generate a JSON Schema
Open →JSON to Base64
Encode and decode Base64 JSON
Open →JSON Stringify
Stringify and parse escaped JSON
Open →JSON Escape
Escape text for a JSON string
Open →JSON Unescape
Decode an escaped JSON string
Open →One private JSON toolkit for every job
These online JSON tools share a single principle: everything runs client-side, so your data is never uploaded. Use the formatter to pretty-print, the validator to catch syntax errors with an exact line and column, the minifier to shrink payloads, JSON Sort to sort JSON keys A to Z or Z to A, JSON Stringify to escape JSON for embedding in code or database fields, and the viewer to explore structure as a tree. Flatten nested data with JSON Flatten or rebuild nested JSON from flat keys with JSON Unflatten. Need a mock data? Use JSON Generator to create template-driven mock JSON data. Need a different format? Convert JSON to CSV, JSON to JSONL, JSON to Base64, JSON to HTML Table, JSON to Markdown Table, CSV to JSON, JSONL to JSON, JSON to Excel, and Excel to JSON — each with control over shapes, delimiters, and nested data. New here? Start with how it works or the JSON guides blog.