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JSON API to XLSX for invoices: 9 document generation tools

For invoices, we list 9 tools that turn JSON sent to an API into an Excel workbook. The lowest paid starting price is $15 a month, from DocRaptor. The first three in our order are Conga Composer, Carbone and Fluent (Windward).

Tools
9
With USD price
5, from $15
Free tier
5
Direct / via Zapier
7 / 2
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
    Syncfusion Document SDK syncfusion.com

    $1,199/developer/yr (computed $99.92/mo).

    Outputs PDF, DOCX, XLSX, PPTX Template Word
    $99.92 / mo
  5. 05
    DocRaptor docraptor.com

    HTML to PDF via Prince. Basic $15/mo, 125 docs.

    Outputs PDF, XLSX Template HTML
    $15 / mo, cheapest here
  6. 06
    Experlogix Document Automation experlogix.com

    Also Dynamics 365, SugarCRM, Power Platform.

    Outputs PDF, DOCX, XLSX, email, e-sign documents Template Word Also reads Salesforce
    On request
  7. 07
    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
  8. 08
    Docupilot Editor's pick via Zapier docupilot.com

    Starter $29/mo, 100 docs.

    Outputs PDF, DOCX, PPTX, XLSX, e-sign documents Template Word, Visual builder Also reads Airtable, Zapier/Make/n8n, built-in forms
    $29 / mo
  9. 09
    Documentero via Zapier documentero.com

    Micro $19.50/mo shown; price formatting unclear on page.

    Outputs DOCX, XLSX, PDF Template Word Also reads Google Sheets, CSV, Excel, Zapier/Make/n8n +1
    $19.50 / mo

What differs for JSON API

For invoices delivered as XLSX, templates are built in Word (7), HTML (2) and a visual builder (1). Among them, 2 need Zapier, Make or n8n to read JSON sent to an API, so they sit after the tools with a direct connection. Of these, 5 have a free tier.

Besides XLSX, these tools for invoices also write PDF (9), DOCX (8) and PPTX (6). Your own code decides when to call the API, so a document can be built on any event. Published starting prices run from $15 to $99.92 a month, the top end from Syncfusion Document SDK. Prices were checked on 20 Oct 2026.

Nearby pages

Broader list: JSON API to XLSX (10 tools).

Related lists: JSON API to XLSX for contracts (6 tools), JSON API to XLSX for reports (6), JSON API to XLSX for statements (4), JSON API to PDF for invoices (35), JSON API to DOCX for invoices (13), JSON API to PPTX for invoices (7), JSON API to HTML for invoices (6).

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

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