https://localfirsttools.com/ Format, convert and inspect data in your browser. Nothing is uploaded. en Tue, 01 Sep 2026 12:00:00 GMT https://localfirsttools.com/guides/pretty-print-json https://localfirsttools.com/guides/pretty-print-json Paste JSON into the formatter and press Format (2-space indents, exact error positions), or use jq in the terminal. The file never leaves your tab. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/fix-unexpected-token-json https://localfirsttools.com/guides/fix-unexpected-token-json Unexpected token means the parser hit illegal syntax: a trailing comma, single quotes, comments or an HTML error page. Find the exact line locally. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/json-vs-yaml-vs-csv https://localfirsttools.com/guides/json-vs-yaml-vs-csv JSON for APIs and precision, YAML for human-edited configs, CSV for tabular exports, how data model, comments and types decide, with converters. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/how-to-decode-a-jwt https://localfirsttools.com/guides/how-to-decode-a-jwt Split the token on its two dots and Base64URL-decode the first two segments, no key needed. Decoding shows the claims but never verifies anything. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/base64-vs-base64url https://localfirsttools.com/guides/base64-vs-base64url Base64URL swaps + and / for - and _ and drops = padding so tokens survive URLs. That is why JWT segments fail standard decoders, and how to convert. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/uuid-v4-vs-v7 https://localfirsttools.com/guides/uuid-v4-vs-v7 v4 is 122 random bits; v7 leads with a 48-bit timestamp so IDs sort by creation time (RFC 9562). v7 suits database keys, v4 hides creation time. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/sha-256-vs-sha-1-vs-md5 https://localfirsttools.com/guides/sha-256-vs-sha-1-vs-md5 Use SHA-256 for anything that matters, SHA-1 and MD5 are collision-broken and fit only legacy checksums. What broken means and when it bites you. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/guides/unix-seconds-vs-milliseconds https://localfirsttools.com/guides/unix-seconds-vs-milliseconds Count the digits: 10 means seconds, 13 means milliseconds. Mixing them lands in January 1970 or the year 56637, two bug signatures explained. Mon, 31 Aug 2026 12:00:00 GMT https://localfirsttools.com/compare/jsonformatter-org https://localfirsttools.com/compare/jsonformatter-org Both format JSON free in the browser. JSONFormatter.org adds save-and-share extras that move data; LocalFirstTools keeps everything in your tab. Tue, 01 Sep 2026 12:00:00 GMT https://localfirsttools.com/compare/jwt-io https://localfirsttools.com/compare/jwt-io jwt.io is the canonical debugger and verifies signatures with a pasted key. For quick claim checks inside a local-only toolkit, the simpler decoder wins. Tue, 01 Sep 2026 12:00:00 GMT https://localfirsttools.com/compare/code-beautify https://localfirsttools.com/compare/code-beautify Code Beautify wins on breadth with hundreds of converters; LocalFirstTools ships 23 tools with one verifiable rule, nothing leaves the tab. Tue, 01 Sep 2026 12:00:00 GMT https://localfirsttools.com/compare/tinywow https://localfirsttools.com/compare/tinywow TinyWow is server-side file tools, PDF, video, image. LocalFirstTools is 23 browser-only data tools. Merge PDFs there; format JSON and tokens here. Tue, 01 Sep 2026 12:00:00 GMT https://localfirsttools.com/compare/best-free-json-formatter https://localfirsttools.com/compare/best-free-json-formatter What separates JSON formatters (exact error positions, big-file handling, privacy) with honest picks per situation, including when ours is not it. Tue, 01 Sep 2026 12:00:00 GMT https://localfirsttools.com/compare/browser-vs-server-json-tools https://localfirsttools.com/compare/browser-vs-server-json-tools Browser tools process JSON on your device; server tools receive it. Where data physically goes, how to verify it in the network tab, when servers win. Tue, 01 Sep 2026 12:00:00 GMT