OpenAnyFile
Works
Viewing, inspecting and verifying. You get a collapsible, syntax-coloured tree you can expand node by node. File details, exact byte size and the detected signature are always shown.
How to open a .ndjson file
You have a NDJSON file and nothing on your machine will touch it. Here is what the format actually is, and how to read one in about four seconds without installing anything.
What is a .ndjson file?
Newline Delimited JSON is a data & config format developed by Community specification, first appearing in 2013. It is normally produced by Log pipelines, bulk API exports.
One complete JSON object per line, so a multi-gigabyte export streams line by line. The file as a whole is deliberately not valid JSON, which is why strict parsers reject it.
| Full name | Newline Delimited JSON |
|---|---|
| File category | Data & config |
| MIME type | application/x-ndjson |
| Developer | Community specification |
| Introduced | 2013 |
| Usually created by | Log pipelines, bulk API exports |
| OpenAnyFile engine | JSON tree viewer |
| Opens without upload | Yes — parsed locally in your browser |
Open a .ndjson file in your browser
OpenAnyFile routes .ndjson to its JSON tree viewer, which parses a collapsible, syntax-coloured tree you can expand node by node.
- Open the OpenAnyFile opener in this browser — nothing to download or sign up for.
- Drag your .ndjson file onto the drop zone, click to browse for it, or paste it with Ctrl+V.
- The extension is detected and the file is handed to the JSON tree viewer.
- Your NDJSON opens on its own viewer page: a collapsible, syntax-coloured tree you can expand node by node.
- Use fullscreen for a closer look, or download the file back out unchanged. Nothing is transmitted anywhere — the parsing happens in your own browser process.
What you can and cannot do with it here
Does not work
Editing and re-saving. OpenAnyFile is a reader, not an editor — for changes you still need special software or an equivalent.
Is it safe to open a {E} file on a website?
It depends entirely on whether the website uploads it, and almost all of them do. That is a real problem when the data & config file in question is a contract, a client deliverable or something under NDA. OpenAnyFile removes the question: the decoding happens inside your browser tab, so there is no transfer, no queue, no temporary storage and no retention window to read about in a privacy policy.
Frequently asked questions about NDJSON files
Can I open a .ndjson file without installing special software?
Yes. OpenAnyFile's JSON tree viewer runs in your browser, so you can read a NDJSON file with nothing installed. You get a collapsible, syntax-coloured tree you can expand node by node. For full editing you still need the original application — this is a viewer, not an editor.
How can I tell what a .ndjson file actually contains?
The .ndjson extension carries no fixed signature, so the extension alone proves nothing. Opening it in OpenAnyFile shows the raw header bytes and detected type, which is the only reliable way to identify one.
Is it safe to open a NDJSON file online?
With OpenAnyFile, yes, because nothing is uploaded. The file is read locally through your browser's File API and never leaves your device, so there is no server copy to leak, log or retain. That matters most for the kind of file people are least willing to hand to a random converter site.
What is a .ndjson file, exactly?
Newline Delimited JSON — an application/x-ndjson format created by Community specification since 2013. One complete JSON object per line, so a multi-gigabyte export streams line by line. The file as a whole is deliberately not valid JSON, which is why strict parsers reject it.
Does the same viewer handle formats related to NDJSON?
Yes — the same engine also opens .json, .geojson, .har, so you can compare related files without switching tools.
Related formats
These open with the same engine, so if you have one of these sitting next to your .ndjson file, it will open too: