Document translation service

Translate JSON Files Online - Keys, Values & Nesting Preserved

Upload any JSON file and get an accurate translation in 100+ languages. Keys, placeholders, arrays, and nested objects - all preserved. Production-ready output.

Translate My JSON View Pricing
Secure processing Fast results No setup required
100+ Languages supported
Formatting Workflow quality controls
GDPR Secure private processing

Output preview

Translate JSON Files Online - Keys, Values & Nesting Preserved layout preview

A translated file is only useful if tables, headings and spacing are still where your team expects them. ForgeFile keeps the document structure visible from upload to download.

Original EN
Q3 supplier agreement
Translated ES
Acuerdo de proveedor Q3

Formats

Translate JSON Files Online - Keys, Values & Nesting Preserved supported file types

Not every file is a clean PDF. The useful cases are messy: scanned contracts, spreadsheet tabs, slide decks, subtitles and audio exports from meetings.

Office and PDF

Documents, decks and spreadsheets where layout matters.

PDFDOCXPPTXXLSXRTF

Scans and images

Photos, scans and image-heavy PDFs that need text extraction first.

JPGPNGTIFFScanned PDF

Localization files

Structured text files where keys, timings and markup should stay intact.

CSVJSONXMLSRTVTT

Translate JSON Files Online - Keys, Values & Nesting Preserved features

Key & Structure Preservation

Keys are never translated or modified. Every nested object, array, and value type stays exactly as in the original. Your JSON remains valid and production-ready.

Placeholder Protection

Variables like {name}, {{count}}, %s, and ICU patterns are detected and preserved. Your app logic works perfectly in every language.

Lightning-Fast Results

Most JSON files are translated in seconds. Cloud-based AI handles even large config files and deeply nested structures.

100+ Languages Supported

Translate JSON files between 100+ languages including Spanish, French, German, Arabic, Chinese, Japanese, and Korean.

How to Translate a JSON File in 4 Steps

  1. 1

    Upload Your JSON File

    Drag and drop your .json file, or browse to select it. We support i18n files, config data, and API responses up to 10 MB.

  2. 2

    Select Source & Target Language

    Choose from 100+ languages. ForgeFile auto-detects the source language and understands app UI context for natural translations.

  3. 3

    Configure Translation Settings

    Choose which keys to translate and which to skip. Select output formatting (minified or pretty-printed) for your workflow.

  4. 4

    Download Your Translated JSON

    Your translated JSON is ready in seconds. All keys, placeholders, and nesting are preserved - drop it into your project and deploy.

All Document Translation

Why ForgeFile Is the Best JSON Translator Online

Need to translate a JSON file without breaking your app's data structure? ForgeFile is an AI-powered JSON translator that converts your localization files into 100+ languages while preserving every key, placeholder, array, and nested object. Whether it's i18n strings, API responses, or config data, your translated JSON is valid, diff-friendly, and ready for production.

How ForgeFile Translates JSON Files

Our translation engine understands JSON semantics. When you translate a JSON file, ForgeFile:

  • Parses the full object tree - keys, values, arrays, and nested structures
  • Translates only string values using context-aware AI that understands UI text and app terminology
  • Preserves keys, placeholders ({name}, {{count}}, %s), ICU patterns, and variable references

The result is a valid JSON file you can drop directly into your project - no broken syntax, no missing keys, no corrupted placeholders.

Placeholder-Safe & Developer-Friendly Output

ForgeFile is built for developer workflows:

  • Keys are never translated or modified - only string values are localized
  • Placeholders like {username}, {{count}}, %d, and $t() references are preserved
  • ICU MessageFormat patterns (plurals, selects, numbers) stay valid
  • Nested objects and arrays maintain their exact structure and depth
  • Output is diff-friendly with consistent formatting for clean version control

Built for App Localization, APIs & SaaS Products

ForgeFile handles the JSON files development teams work with every day:

  • i18n & App Localization - translate React, Vue, Angular, and Next.js localization files (i18next, react-intl, vue-i18n)
  • Mobile Apps - localize Flutter, React Native, and Expo string bundles
  • SaaS & Web Products - translate UI labels, error messages, notifications, and onboarding flows
  • API & Config Data - localize API response templates, webhook payloads, and configuration values

Bulk translation and API access are available for CI/CD pipeline integration. All files are encrypted in transit and at rest, with automatic deletion after processing - fully GDPR-compliant.

Why Developers Choose ForgeFile for JSON Translation

  • Key-Safe Translation - keys are never modified, only string values are translated
  • Placeholder Protection - {variables}, {{templates}}, and ICU patterns stay intact
  • 100+ Languages - including right-to-left scripts (Arabic, Hebrew) and CJK characters
  • Diff-Friendly Output - clean formatting for git diffs and code review
  • No Software to Install - works entirely in your browser
  • Enterprise-Grade Security - encrypted processing, zero data retention

Upload your JSON file now and see why thousands of developers trust ForgeFile for accurate, key-safe JSON translation.

JSON Translation FAQ - Common Questions Answered

How do I translate a JSON file online?

Upload your JSON file to ForgeFile, select your target language, and click Translate. Our AI translates string values while preserving all keys, placeholders, and structure - typically in seconds.

Are JSON keys translated or modified?

No. ForgeFile translates only string values. Keys are never modified, renamed, or reordered. Your translation file maps 1:1 with the original.

Are placeholders and variables preserved?

Absolutely. ForgeFile detects and protects placeholders like {name}, {{count}}, %s, %d, $t() references, and ICU MessageFormat patterns.

Does it work with i18next, react-intl, or vue-i18n?

Yes. ForgeFile handles all major i18n JSON formats including i18next, react-intl, vue-i18n, Angular i18n, and custom localization structures.

Are nested objects and arrays preserved?

Yes. Every level of nesting, array order, and object structure is preserved exactly. The translated JSON has the same shape as the original.

Is there a file size limit?

You can translate JSON files up to 10 MB. For larger files or CI/CD pipeline integration, contact us about enterprise plans with API access.

Is my JSON data secure during translation?

Yes. All files are encrypted in transit and at rest. Documents are automatically deleted after processing. Our infrastructure follows GDPR-compliant data handling practices.

What is the difference between translating JSON and XML localization files?

JSON uses key-value pairs and is standard for modern web and mobile apps. XML uses tags and attributes and is common for Android and legacy systems. ForgeFile handles both natively with full structure preservation.

Translate JSON Files Online - Keys, Values & Nesting Preserved output

Upload your JSON file and get production-ready translated output in seconds. Keys, placeholders, and structure preserved, every time.

Translate My JSON