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JSON API to HTML for invoices: 6 document generation tools

For invoices, we list 6 tools that turn JSON sent to an API into an HTML page. The lowest paid starting price is $19 a month, from SourceToDocs. The first three in our order are Conga Composer, Carbone and Fluent (Windward).

Tools
6
With USD price
3, from $19
Free tier
3
Direct / via Zapier
6 / 0
Checked
20 Oct 2026
  1. 01
    Conga Composer Editor's pick conga.com

    Enterprise Salesforce document generation.

    Outputs PDF, DOCX, XLSX, PPTX, HTML, email Template Word Also reads Salesforce G2 4.4 (849)
    Not published
  2. 02
    Carbone Editor's pick carbone.io

    Priced in EUR: Essential EUR 29/mo (EUR 26 annual).

    Outputs PDF, DOCX, XLSX, PPTX, HTML Template Word Also reads Airtable, Zapier/Make/n8n
    $28 EUR 26, converted
  3. 03
    Fluent (Windward) windwardstudios.com

    Formerly Windward Studios, acquired by PDFTron (now Apryse).

    Outputs PDF, DOCX, XLSX, PPTX, HTML Template Word Also reads Salesforce, Excel G2 4.4 (77)
    On request
  4. 04
    SourceToDocs sourcetodocs.com

    Data to Google Slides and Docs.

    Outputs Google Slides, Google Docs, PDF, PPTX, DOCX, HTML Template Google Docs Also reads Airtable, Google Sheets, CSV
    $19 / mo, cheapest here
  5. 05
    Docmosis docmosis.com

    Cloud Professional $49/mo, 4,000+ pages.

    Outputs PDF, DOCX, HTML Template Word
    $49 / mo
  6. 06
    jsreport jsreport.net

    Free up to 5 templates. Enterprise $395/yr single instance.

    Outputs PDF, DOCX, XLSX, PPTX, HTML Template HTML
    On request free tier

What differs for JSON API

For invoices delivered as HTML, templates are built in Word (4), Google Docs (1) and HTML (1). All 6 read JSON sent to an API without a Zapier, Make or n8n step in between. Of these, 3 have a free tier.

Besides HTML, these tools for invoices also write PDF (6), DOCX (6) and PPTX (5). Your own code decides when to call the API, so a document can be built on any event. Published starting prices run from $19 to $49 a month, the top end from Docmosis. Prices were checked on 20 Oct 2026.

Nearby pages

Broader list: JSON API to HTML (7 tools).

Related lists: JSON API to HTML for reports (6 tools), JSON API to PDF for invoices (35), JSON API to DOCX for invoices (13), JSON API to XLSX for invoices (9), JSON API to PPTX for invoices (7).

How to generate PDFs from a JSON API: a step-by-step guide, updated 21 Oct 2026.

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