Short, practical articles on JSON, YAML, CSV and Markdown — debugging tips, format quirks, and how the tools on this site are built.
Most PDFs do not carry their visible tables as reusable table structure, so converters have to guess. Measured across 7 real PDFs: the two ways extraction fails, why a plausible-looking table can still be wrong, and what to do next.
Convert JSON to CSV in your browser with no upload. We ran the same 15 JSON inputs through FormatArc, json-2-csv, Miller and pandas: see exactly where they disagree on nested objects, arrays, missing keys and nulls.
Dev.to stores Markdown, Hashnode exports JSON (plus per-article Markdown via .md URLs), Medium hands you HTML. How to get your posts out, rebuild front matter, keep canonical URLs, and convert leftover HTML to Markdown in your browser.
Convert Gmail, Outlook, and .eml email to Markdown in your browser, nothing uploaded. Measured: pasting the full source collapses into a 12-column table.
See which Markdown characters need a backslash, which don't, and where escaping fails entirely. Every claim is tested against GitHub's renderer, marked, remark-gfm, and strict CommonMark — 22 cases in all.
Three ways to migrate WordPress posts to Markdown: bulk-convert the export XML with a CLI, use an exporter plugin, or convert post HTML in your browser with nothing uploaded. Covers images, shortcodes, and frontmatter cleanup.
Two paths from Notion to clean Markdown: fix the Markdown & CSV ZIP export (UUIDs, callouts, synced blocks), or export as HTML and convert in your browser — no upload.
Convert Markdown frontmatter YAML to JSON in the browser. SSG matrix for Hugo, Jekyll, Astro, Next.js, Eleventy, 5 breaking types (Norway problem, dates, anchors), JSON→YAML round-trip.
Turn API responses into Markdown tables with curl + jq. Covers 6 API shapes ranked by difficulty, pagination joining, nested flattening, and a browser-only workflow that never uploads your data.
Compare YAML vs Markdown, JSON, and CSV in one page: decision matrix, feature comparison, comment support, parser ecosystem, LLM context guidance, and the same data shown in all four formats.
Clean copy from web to Markdown: convert messy HTML from Word, Google Docs, ChatGPT, or web pages into clean Markdown. Remove spans, inline styles, classes, and Word-specific markup in your browser — no upload.
Markdown table not rendering or broken? Use parser-tested fixes for column counts, blank lines, and pipe escapes — or rebuild from CSV in your browser, no upload.
One comma before } or ] breaks the parse. Compare the Node.js and Python messages, find the line in a browser-only formatter, and check which of JSONC and JSON5 still accept it.
Paste an HTML table and get a GitHub-Flavored Markdown table in your browser. Pipes (|), line breaks, and ragged rows are handled safely — nothing uploaded.
Paste cells from Excel or Google Sheets and get a Markdown table. Also covers the way back: why pipes never split into Excel columns, and the tab swap that fixes it.
Turn a JSON array of objects into a Markdown table. Verify the structure, convert through CSV for a reliable result, handle API responses, and flatten nested JSON — all in the browser.
Online converter security checklist. 2025 breach analysis (watchTowr disclosure of jsonformatter.com / codebeautify.org data leak) plus a 5-step DevTools verification to confirm browser-side processing yourself. Safer alternatives: jq, yq, offline tools.
Markdown beats HTML for LLM prompts on token cost (-71% in our measured benchmark, -68 to -87% in published reports) and table extraction accuracy. See where HTML is still the right pick, and convert in your browser so internal HTML never leaves the tab.
Tables are a GFM extension, not CommonMark core. We ran 6 parsers on tables, strikethrough, task lists, bare URLs and footnotes, and recorded the HTML each emits.
Copy-paste GFM table examples: alignment, empty cells, <br> line breaks, escaped pipes, and why merged cells need HTML — plus GitHub, GitLab, Obsidian & Notion.
Create a GitHub README table from CSV or JSON without hand-writing pipes. Paste data, convert to GFM Markdown, and keep everything in your browser.
Convert HTML to Markdown in your browser or with Pandoc, Turndown, Python, and Go. Compare tag handling, tables, common fixes, and formatting limits.
Do Markdown tables need three dashes? Tested on GitHub, marked, and remark-gfm: one dash renders fine. What actually breaks tables — and why CommonMark shows none.
Convert CSV data into a GitHub Flavored Markdown table for READMEs, issues, and documentation. Browser-based, no signup, no upload.
Compare browser-based, Node.js, and Pandoc workflows for converting Markdown to HTML. Code examples for marked.js, markdown-it, npm and CLI options, with GFM tables and task lists.
"Comments are not permitted in JSON" means the file is being parsed as strict JSON — RFC 8259 and ECMA-404 both exclude them. Fix it with JSONC, JSON5, a _comment field, or comment stripping.
Learn YAML syntax with examples for indentation, lists, maps, strings, booleans, and nulls. Includes fixes for parser errors in JetBrains/IntelliJ and Helm templates ("forbidden to specify block composed value at the same line as key"), Kubernetes, Docker Compose, and CI files.
Format curl JSON output with jq, python -m json.tool, or a no-upload browser when jq isn't installed. Covers curl -i headers and copy-paste one-liners.
We installed and measured seven Chrome JSON viewer and formatter extensions: only two auto-formatted a 10 MB file. Permissions, size and source compared.
A Chrome extension that converts YAML, CSV, Markdown and HTML as well as formatting JSON, from the toolbar. No host permissions, everything runs locally.
Run npx formatarc to format JSON, convert YAML, CSV, Markdown, and HTML from your terminal. Import it as an API in Node.js projects — no browser needed.
Pretty-print JSON online in your browser, or format it from the terminal with jq and Python. Free JSON formatter with JSON.stringify examples and parse error fixes.
Learn the correct way to write JSON with examples for every data type, nesting patterns, and common mistakes to avoid.
A practical guide to the CSV file format: document structure, the header row, RFC 4180 quoting, delimiters, UTF-8 BOM vs Shift-JIS and Windows-1252, Excel auto-formatting traps, and reading CSV with Python pandas.
What is JSON: a 2026 beginner-to-practitioner guide covering syntax, data types, real-world uses (Web APIs, config files, npm), with a quick-reference table for common patterns.
YAML basics for beginners: indentation, arrays, comments, and how Kubernetes and GitHub Actions use it. Validate YAML in your browser.
The same YAML through js-yaml, PyYAML and ruamel.yaml lands as different JSON. See the measured table, plus comments, types, anchors, speed, LLM token cost, and when to choose each format.
Fix JSON parse errors fast: "undefined" is not valid JSON, "[object Object]" is not valid JSON, and the older unexpected token u/o at position 0 wording. In-browser, no upload.
Convert YAML to JSON three ways: Python one-liner, yq CLI, and browser tool (no upload, no install). Covers 8 conversion gotchas (Norway problem, multi-document YAML, anchors expansion, comments lost), NDJSON streaming, and CI/CD automation.
Convert CSV to JSON in your browser without uploading data, or with Python, Node.js, Go, Miller, and csvkit. Covers 5 output shapes (NDJSON, nested, keyed), type inference, Shift-JIS/UTF-8 encoding, and large-file streaming.
Convert JSON to YAML for Kubernetes manifests, Docker Compose, Helm values, and Ansible playbooks. Browser tool (no upload), yq, Python, Node.js, Go. Preserves key order, handles block scalars, multi-document output, string quoting, and the Norway problem.
