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JSON Link
Local-first open-source i18n spreadsheet & MCP server
Free open-source client-side localization spreadsheet & i18n workspace. Convert between Nested JSON, Excel, CSV, Flutter ARB, iOS strings, and Android XML with variable-safe AI translation, Zawgyi Unicode conversion, and automated GitHub PR sync.
Hi everyone, I’m Pyae Phyo Maung, creator of JSON Link.
If you build cross-platform apps across Flutter, React, iOS, or Android, you know how fragile localization pipelines can be. We repeatedly hit three major bottlenecks:
Runtime Token Crashes: Non-technical translators or general AI models frequently break variable syntax ({count}, %1$s, {{name}}). When your mobile app boots up, missing parameters trigger unhandled exceptions and production crashes.
Multi-Format Overhead: Converting spreadsheets into Flutter ARB (@key metadata), Android strings.xml, iOS Localizable.strings, and TypeScript definitions requires manual formatting or glue scripts.
Data Privacy & SaaS Bloat: Paying monthly subscriptions just to manage string key-value pairs while sending unreleased app copy to third-party clouds creates avoidable operational risk.
I built JSON Link to fix this once and for all: an open-source, local-first localization workstation that runs entirely in your browser with zero backend.
Key Architecture Highlights:
Authentic Spreadsheet UX: Full edge-to-edge grid with freeze panes, formula bar (fx), drag-to-resize columns, Excel-compatible copy-paste, and 50-step undo/redo.
Deterministic AST Token Isolation: Parses ICU MessageFormat, Mustache, and Printf tokens into locked visual tags so variables cannot be accidentally modified.
Direct Local Folder Sync: Uses the Native File System Access API to bind directly to your project's local folder (src/locales or assets/l10n). Writes straight to disk across all formats with 1 click.
Direct GitHub Sync & Automated PR Workflow: Connects to public/private repos via GitHub PAT directly in-browser. Tree-scans standard locale directories (locales/, l10n/, values-*/), loads files into the grid, and automatically opens a Pull Request with a dedicated feature branch (jsonlink/translations-...). Built-in safety guardrails permanently block read/write access to code, configurations, and secrets.
Zero-Knowledge Workspace Sharing (#share=...): Compresses multi-language workspace payloads in-browser using DEFLATE (pako) into the URL hash fragment. Zero server storage, zero database overhead. Plaintext data never touches a server.
Client-Side AES-GCM 256-bit Encryption: Optional password-protected encryption for Instant URLs and standalone .jsonlink project files (PBKDF2 key derivation, 100,000 iterations via Web Crypto API).
OpenRouter BYOK Security: Bring your own API key with client-side AES-GCM 256-bit encryption. Zero server hops between the browser and LLMs.
AI Termbase & Glossary: Enforces strict glossary rules to preserve brand names during batch translations.
Zawgyi ⇄ Unicode Transcoder: Built-in Rabbit heuristics for legacy Southeast Asian font encoding detection and conversion.
Universal 1-Click Exporters: Production-ready bundles for Flutter ARB, Android XML, iOS Strings, TypeScript translations.d.ts, Excel, and CSV.
Native MCP Server: Standalone stdio JSON-RPC 2.0 server exposing localization tools directly to Claude Desktop, Cursor, and Google Antigravity.
Verification Baseline:
308 automated tests across 42 suites (Vitest / RTL) enforced in CI.
100% offline desktop PWA capability.
MIT licensed, zero telemetry, zero analytics scripts.
We would love to hear your feedback:
Are there edge-case interpolation formats or CLI parsers you need in your daily workflow?
What additional tools would you like exposed in the stdio MCP server for agentic IDE workflows?
JSON Link was submitted on Product Hunt and earned 3 upvotes and 1 comments, placing #56 on the daily leaderboard. Free open-source client-side localization spreadsheet & i18n workspace. Convert between Nested JSON, Excel, CSV, Flutter ARB, iOS strings, and Android XML with variable-safe AI translation, Zawgyi Unicode conversion, and automated GitHub PR sync.
On the analytics side, JSON Link competes within Open Source, Developer Tools and GitHub — topics that collectively have 630.1k followers on Product Hunt. The dashboard above tracks how JSON Link performed against the three products that launched closest to it on the same day.
Who hunted JSON Link?
JSON Link was hunted by Pyae Phyo Maung. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of JSON Link including community comment highlights and product details, visit the product overview.
Pyae Phyo Maung
Hi everyone, I’m Pyae Phyo Maung, creator of JSON Link.
If you build cross-platform apps across Flutter, React, iOS, or Android, you know how fragile localization pipelines can be. We repeatedly hit three major bottlenecks:
Runtime Token Crashes: Non-technical translators or general AI models frequently break variable syntax ({count}, %1$s, {{name}}). When your mobile app boots up, missing parameters trigger unhandled exceptions and production crashes.
Multi-Format Overhead: Converting spreadsheets into Flutter ARB (@key metadata), Android strings.xml, iOS Localizable.strings, and TypeScript definitions requires manual formatting or glue scripts.
Data Privacy & SaaS Bloat: Paying monthly subscriptions just to manage string key-value pairs while sending unreleased app copy to third-party clouds creates avoidable operational risk.
I built JSON Link to fix this once and for all: an open-source, local-first localization workstation that runs entirely in your browser with zero backend.
Key Architecture Highlights:
Authentic Spreadsheet UX: Full edge-to-edge grid with freeze panes, formula bar (fx), drag-to-resize columns, Excel-compatible copy-paste, and 50-step undo/redo.
Deterministic AST Token Isolation: Parses ICU MessageFormat, Mustache, and Printf tokens into locked visual tags so variables cannot be accidentally modified.
Direct Local Folder Sync: Uses the Native File System Access API to bind directly to your project's local folder (src/locales or assets/l10n). Writes straight to disk across all formats with 1 click.
Direct GitHub Sync & Automated PR Workflow: Connects to public/private repos via GitHub PAT directly in-browser. Tree-scans standard locale directories (locales/, l10n/, values-*/), loads files into the grid, and automatically opens a Pull Request with a dedicated feature branch (jsonlink/translations-...). Built-in safety guardrails permanently block read/write access to code, configurations, and secrets.
Zero-Knowledge Workspace Sharing (#share=...): Compresses multi-language workspace payloads in-browser using DEFLATE (pako) into the URL hash fragment. Zero server storage, zero database overhead. Plaintext data never touches a server.
Client-Side AES-GCM 256-bit Encryption: Optional password-protected encryption for Instant URLs and standalone .jsonlink project files (PBKDF2 key derivation, 100,000 iterations via Web Crypto API).
OpenRouter BYOK Security: Bring your own API key with client-side AES-GCM 256-bit encryption. Zero server hops between the browser and LLMs.
AI Termbase & Glossary: Enforces strict glossary rules to preserve brand names during batch translations.
Zawgyi ⇄ Unicode Transcoder: Built-in Rabbit heuristics for legacy Southeast Asian font encoding detection and conversion.
Universal 1-Click Exporters: Production-ready bundles for Flutter ARB, Android XML, iOS Strings, TypeScript translations.d.ts, Excel, and CSV.
Native MCP Server: Standalone stdio JSON-RPC 2.0 server exposing localization tools directly to Claude Desktop, Cursor, and Google Antigravity.
Verification Baseline:
308 automated tests across 42 suites (Vitest / RTL) enforced in CI.
100% offline desktop PWA capability.
MIT licensed, zero telemetry, zero analytics scripts.
We would love to hear your feedback:
Are there edge-case interpolation formats or CLI parsers you need in your daily workflow?
What additional tools would you like exposed in the stdio MCP server for agentic IDE workflows?
Repository: https://github.com/pyaephyomaungdev/json-link
Live App: https://json-link.pages.dev/