https://www.fileviewer.dev A fast, privacy-first file viewer for JSON, YAML, XML, CSV and Markdown. Everything runs in your browser — your files never leave your device. en Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/json-viewer https://www.fileviewer.dev/json-viewer View and explore JSON files in your browser. Tree, table, graph and code views, JSONPath queries and schema validation. Nothing is uploaded. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/yaml-viewer https://www.fileviewer.dev/yaml-viewer Read YAML in your browser as a tree or formatted code, with anchors resolved and indentation problems flagged. Nothing is uploaded. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/xml-viewer https://www.fileviewer.dev/xml-viewer Read XML in your browser as a collapsible tree with attributes and namespaces intact, and copy any node as an XPath. Nothing is uploaded. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/csv-viewer https://www.fileviewer.dev/csv-viewer Open a CSV in your browser as a sortable, filterable table with inferred column types, and chart it in one click. Nothing is uploaded. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/best-json-viewer https://www.fileviewer.dev/best-json-viewer An honest comparison of online JSON viewers on the things that differ: whether your file is uploaded, size limits, and which views each one offers. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog https://www.fileviewer.dev/blog Practical guides to JSON, YAML, CSV and XML: syntax, validation, conversion pitfalls, and how to choose between formats. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/json-tutorial https://www.fileviewer.dev/blog/json-tutorial What JSON is, every type it has, and the six rules that cause most JSON errors: trailing commas, NaN, big integers, duplicate keys and more. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/json-vs-yaml https://www.fileviewer.dev/blog/json-vs-yaml JSON for data between machines, YAML for configuration humans edit. The full comparison, plus the YAML gotchas that cause real outages. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/yaml-tutorial https://www.fileviewer.dev/blog/yaml-tutorial YAML syntax from the ground up: indentation rules, block scalars, anchors and aliases, multi-document files, and the type coercion that bites. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/json-schema-guide https://www.fileviewer.dev/blog/json-schema-guide Write a JSON Schema from scratch: types, required, nested objects, arrays, string formats, $ref reuse, and why the draft version changes the result. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/jsonpath-guide https://www.fileviewer.dev/blog/jsonpath-guide JSONPath explained with worked examples: selectors, wildcards, recursive descent, filter expressions, slices, and where implementations disagree. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/how-to-view-json-files https://www.fileviewer.dev/blog/how-to-view-json-files Open and read a JSON file: in a browser, a text editor, the command line with jq, or an online viewer. What each is good and bad at. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/how-to-validate-json https://www.fileviewer.dev/blog/how-to-validate-json Three levels of JSON validation: does it parse, does it mean what you think, and does it match a schema. With the errors that catch people out. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/blog/csv-to-json-guide https://www.fileviewer.dev/blog/csv-to-json-guide Leading zeros, embedded commas, mangled encodings and type coercion: why CSV to JSON conversions corrupt data, and how to avoid each one. Mon, 31 Aug 2026 00:00:00 GMT https://www.fileviewer.dev/json-editor-online-alternatives https://www.fileviewer.dev/json-editor-online-alternatives Alternatives to JSON Editor Online, Code Beautify and JSONLint, matched to the specific reason you are looking: privacy, file size, ads or features. Mon, 31 Aug 2026 00:00:00 GMT