Flatten nested JSON objects into dot-notation key-value pairs. Unwrap complex hierarchies for tabular processing. Dot-notation paths preserve nesting info for spreadsheets and logs — local processing, free, no signup.
Content reviewed October 2026 · About Toolzum
Flatten JSON objects into URL query strings — nest with bracket notation. Build ?filter[x]=1 links from API objects — local conversion, free, no signup.
Prettify raw JSON and XML API responses with indentation, key sorting, and syntax validation. Read nested payloads at a glance — local processing, free, no signup.
Generate realistic mock JSON from field specs — names, emails, dates, nested objects. Fill frontends before backends exist — local generation, free, no signup.
Convert JSON objects to YAML format with proper key-value formatting and nested structure support. Everything runs locally in your browser.
Pull tables, form fields, and key-value pairs from stacks of PDFs into one clean CSV. Accountants turn 60 invoices into a spreadsheet in an afternoon — local pdf-lib parsing, 2 free batches a day.
It converts nested JSON objects into a flat key-value structure using dot notation. For example, {a: {b: 1}} becomes {'a.b': 1}. This makes nested data suitable for CSV export and database imports.
Arrays can be flattened with indexed keys (items.0, items.1) or with bracket notation (items[0]). Choose the style that matches your downstream processing requirements.
Exporting nested API responses to CSV, importing JSON into flat databases, transforming data for spreadsheet analysis, and preparing data for tools that require tabular input.
No hard limit. Deeply nested structures (10+ levels) are flattened correctly, though very deep hierarchies may produce long key names that are harder to read.
No. All flattening happens locally in your browser. No JSON data is sent to any server.
JSON Escape/Unescape
Escape JSON strings for embedding or unescape back to readable text in one click. Fix double-escaped API fixtures fast — local processing, free, no signup.
JSON Path Query Builder
Query JSON data using dot-notation path expressions with wildcard support. Code never leaves your device — formatting and validation run locally in your browser.