Step 1 / source
Choose the source
Drop one file here
Choose the flat json record array you want to turn into github-style markdown table.
Checking publication status...LOCAL TABLE CONVERTER / JSON TO MARKDOWN TABLE
JSON to Markdown Table
Project a flat JSON record array into one escaped GitHub-style Markdown table without flattening nested data.
Processed in this browserOne UTF-8 .json file up to 5 MB. The root must be a non-empty array of flat scalar objects within 50,000 records, 200 columns, 1,000,000 cells, and 20 MB output.
JSON - flat record array
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One UTF-8 .json file up to 5 MB. The root must be a non-empty array of flat scalar objects within 50,000 records, 200 columns, 1,000,000 cells, and 20 MB output.
Plain-language method
How JSON to Markdown Table works
The converter validates flat object records, creates headers in first-seen property order, escapes HTML tag characters, pipes, and backslashes, writes scalar values as cells, and emits one standard Markdown header and delimiter row.
- 01Choose a valid source
Every array item must contain only strings, numbers, booleans, or null. Nested values are rejected rather than serialized ambiguously into cells.
- 02Review the conversion choices
Alignment affects renderer layout only. Missing or null properties become empty cells.
- 03Inspect the separate result
The result ends in _nirmion_tools.md and is designed for documentation review, not as a lossless JSON replacement.
Useful when
Practical jobs this tool handles
- Document approved API examples.
- Create a comparison table from JSON fixtures.
- Share a small record set in a README.
Before converting
Check the source and destination rules
- Flatten nested values deliberately.
- Review union-column order.
- Preview the result in the destination renderer.
Know the boundary
Know what the destination format cannot keep
Markdown cannot preserve JSON types, nested structures, null distinctions, or object boundaries beyond one row per record.
Quick answers
Questions before you convert
The conversion contract is deliberately explicit.
How are columns ordered?
By first appearance across source objects.
Are nested objects stringified?
No. Rejection avoids unreadable and ambiguous cells.
Are tag characters executable?
They are HTML-encoded in generated cells.