US translation agency

JSON Translation Services

Professional translation of JSON localization files for React, Vue, Angular, and Node.js apps. Keys preserved, nested objects supported, pluralization rules.

JSON is the de facto format for i18n string files in React, Vue, Angular, Next.js, and React Native applications. We translate JSON localization files for web and mobile apps. Send the original file and your languages, and we reply with a quote within 12 hours.

Software localization

Translating JSON i18n Files Without Breaking Your App

JSON localization files for frameworks such as react-i18next, vue-i18n, and next-intl use nested key structures, interpolation variables like {{name}} or {count}, and pluralization keys such as one, other, few, and many.

A translator who edits a JSON file in a text editor and inadvertently changes a key name or removes a closing bracket will break your application build, which is why JSON belongs in a proper software localization workflow rather than a plain text editor.

We parse JSON string files to extract translatable values while locking all keys, nesting structure, and interpolation variables. Pluralization keys are preserved and translated with knowledge of the target language's plural rules, which differ significantly across languages.

The delivered JSON file is syntactically valid and immediately importable into your i18n setup, whether the strings drive a web app covered by our website localization service or a native mobile build. For UI strings that sit alongside product documentation, the same linguists handle the technical translation so terminology stays consistent across both.

JSON resource files are never submitted to an authority themselves. When the strings include privacy notices or contract terms that a regulator or a state court may ask about, we can deliver those as a reliable certified translation with a signed certificate of accuracy. Product workshops with developers who speak different languages can be supported by our interpreting services.

What You Get

Key Features of JSON File Translation

Key Structure Preservation

All JSON keys, nesting levels, and structural brackets are preserved exactly. Only string values are translated. The output JSON parses without errors.

Interpolation Variable Locking

Interpolation variables such as {{name}}, {count}, %s, and {0} are identified and locked before translation, preventing accidental modification.

Pluralization Rule Support

Target-language plural forms (one, few, many, zero, other) are generated according to Unicode CLDR plural rules for the target language.

Syntax Validation

The delivered JSON file is validated for syntactic correctness before delivery. No silent errors, missing commas, or encoding issues will reach your build system.

Who We Work With

Who Needs JSON Translation

JSON Translation for Small Businesses

A startup sends string files from its app and gets back JSON with keys and placeholders unchanged.

JSON Translation for In-House Teams

Product teams send locale files with each release, with variables and plural forms handled correctly.

JSON Translation for Nonprofits and Public Agencies

A civic technology team sends interface strings for apps used by multilingual residents.

Questions About JSON Translation

Which i18n Libraries' JSON Formats Do You Support?
We support the JSON formats used by react-i18next, next-intl, vue-i18n, Angular's i18n tooling, LinguiJS, and Phrase. If you use a custom JSON schema, please send a sample file before requesting a quote so we can confirm compatibility.
Can You Handle JSON Files with Deeply Nested Key Structures?
Yes. Deeply nested JSON structures are supported. Keys at any nesting level are preserved exactly. If your JSON has both translatable string values and numeric or boolean values at the same level, only string values are sent for translation.
What Happens If the Target Language Needs Plural Forms Not Present in the Source?
English typically has only two plural forms (one and other). Languages such as Polish, Russian, and Arabic use three to six plural forms. We generate all required plural forms for the target language according to Unicode CLDR plural rules and add them to the JSON output under the correct keys.

Need a Professional Translation?

Request a free, no-obligation quote. We reply within 12 hours.